| U-2 Planes | David, Jack | 760 | 4.6 | - | 3 | 423 | Nonfiction |
| U.S. Air Force Special Op.... | Roberts, Jeremy | 970 | 4.8 | X | 6 | 7,962 | Nonfiction |
| U.S. Air Force, The | Donovan, Sandy | 880 | 5.6 | O | 4 | 7,343 | Fiction |
| U.S. Air Force: Combat Control | Covert, Kim | 740 | 3.5 | NR | 4 | 2,866 | Nonfiction |
| U.S. Air Force: Pararescue | Covert, Kim | 770 | 3.5 | NR | 3 | 2,853 | Nonfiction |
| U.S. Air Force: Special Operat | Boraas, Tracey | 790 | 3.5 | NR | 3 | 3,513 | Nonfiction |
| U.S. Army Rangers | Koons, James | 760 | 3.5 | NR | 3 | 3,019 | Nonfiction |
| U.S. Army Special Op.... | Roberts, Jeremy | 930 | 4.6 | NR | 6 | 6,806 | Nonfiction |
| U.S. Army Special Operations | Green, Michael | 710 | 3.5 | NR | 4 | 3,171 | Nonfiction |
| U.S. Army, The | Benson, Michael | 880 | 5.6 | O | 4 | 7,510 | Nonfiction |
| U.S. Army: Airborne Rangers | Burgan, Michael | 680 | 3.5 | NR | 3 | 2,917 | Nonfiction |
| U.S. Army: Night Stalkers | Weiser, Andrea | 710 | 3.5 | NR | 4 | 2,902 | Nonfiction |
| U.S. Coast Guard, The | Benson, Michael | 980 | 6.6 | X | 6 | 5,785 | Nonfiction |
| U.S. Constitution | Nardo, Don | 870 | 5.6 | Q | 3 | 4,492 | Nonfiction |
| U.S. Constitution For Everyone | Gerberg, Mort | 1300 | 10.0 | Z | 6 | 16,222 | Nonfiction |
| U.S. Declaration - Everyone | Agel, Jerome | 1500 | 10.0 | Z | 7 | 21,944 | Nonfiction |
| U.S. Marine Corps, The | Benson, Michael | 980 | 4.6 | X | 6 | 6,123 | Nonfiction |
| U.S. Naval Special Warfare | Donovan, Sandy | 970 | 6.4 | O | 4 | 7,950 | Nonfiction |
| U.S. Navy Seals | Streissguth, Tom | 840 | 3.5 | NR | 3 | 2,922 | Nonfiction |
| U.S. Navy, The | Streissguth, Tom | 990 | 6.8 | O | 4 | 7,585 | Nonfiction |
| U.S. Navy: SEAL Teams | Burgan, Michael | 740 | 3.5 | NR | 2 | 2,500 | Nonfiction |
| U.S. Navy: Special Boat Units | Burgan, Michael | 740 | 3.5 | NR | 4 | 2,819 | Nonfiction |
| U.S. Presidential Inauguration | Santella, Andrew | 860 | 5.6 | W | 3 | 4,123 | Nonfiction |
| U.S. Supreme Court, The | Elish, Dan | 1110 | 10.5 | R | 4 | 5,336 | Nonfiction |
| U.S. Territories (America-B-2) | McNair, Sylvia | N/A | 9.0 | Z | 6 | 13,124 | Nonfiction |
| U.S. Treasury (American Land.. | Cooper, Jason | 800 | 3.9 | - | 2 | 918 | Nonfiction |
| UFO Diary | Kitamura, Satoshi | 610 | 2.9 | J | 1 | 218 | Fiction |
| UFOs | Herbst, Judith | 820 | 4.8 | U | 4 | 7,607 | Nonfiction |
| UFOs: Fact Or Fiction? | D'Angelo, Laura | 440 | 2.8 | O | 5 | 1,946 | Nonfiction |
| UFOs: What Scientists Say May | Grace, N.B. | 850 | 5.5 | - | 6 | 7,648 | Nonfiction |
| Ug: Boy Genius Of The Stone Ag | Briggs, Raymond | 190 | 4.1 | NR | 2 | 2,741 | Fiction |
| Ugh | Yorinks, Arthur | 310 | 3.7 | L | 1 | 597 | Fiction |
| Ugly | Napoli, Donna Jo | 470 | 5.2 | S | 8 | 28,727 | Fiction |
| Ugly Bugs | Arnold, Nick | 840 | 6.1 | - | 4 | 13,923 | Nonfiction |
| Ugly Caterpillar, The | Sommer, Carl | 300 | 2.5 | K | 2 | 1,719 | Fiction |
| Ugly Duckling | Crossley-Holland, Kevin | 400 | 3.5 | O | 2 | 2,039 | Fiction |
| Ugly Duckling (Anthology), The | Fear, Sharon | 120 | 2.1 | - | 1 | 150 | Fiction |
| Ugly Duckling (Ziefert), The | Ziefert, Harriet | BR | 1.5 | G | 1 | 340 | Fiction |
| Ugly Duckling, The (Andersen) | Andersen, Hans Christian | 650 | 3.1 | J | 2 | 1,825 | Fiction |
| Ugly Duckling, The (Cauley) | Cauley, Lorinda Bryan | 520 | 3.7 | O | 3 | 3,080 | Fiction |
| Ugly Princess & The Wise Fool | Gray, Margaret | 870 | 5.2 | P | 7 | 22,443 | Fiction |
| Ugly Vegetables, The | Lin, Grace | 390 | 2.8 | L | 2 | 920 | Fiction |
| Uh-Oh Said The Crow | Oppenheim, Joanne | 440 | 2.1 | J | 1 | 559 | Fiction |
| Uh-Oh, Leonardo! | Sabuda, Robert | 690 | 3.8 | N | 3 | 3,526 | Fiction |
| Ukraine | Kummer, Patricia K. | 940 | 7.1 | NR | 5 | 21,021 | Nonfiction |
| Ukraine Sasha Kotyenko's... | Touba, Jacquiline | 690 | 3.9 | - | 2 | 949 | Nonfiction |
| Ukraine: Festivals...World | Bassis, Vladimir | 970 | 5.8 | - | 3 | 2,696 | Nonfiction |
| Ukrainian Egg Decoration | Stalcup, Ann | 860 | 7.2 | - | 2 | 1,071 | Nonfiction |
| Ultimate Cheerleading | Scott, Kieran | 1050 | 5.2 | - | 4 | 8,997 | Nonfiction |
| Ultimate Field Trip 2: Digging | Goodman, Susan E. | 880 | 5.5 | S | 3 | 5,196 | Nonfiction |
| Ultimate Field Trip 4 | Goodman, Susan E. | 830 | 5.2 | S | 3 | 5,629 | Nonfiction |
| Ultimate Rugrats Fan Book | Graham, Jefferson | 1050 | 6.0 | - | 2 | 4,057 | Nonfiction |
| Ultimate, The | Applegate, K. A. | 410 | 5.1 | R | 8 | 22,614 | Fiction |
| Ultra-Organized Cell Systems | Johnson, Rebecca L. | 650 | 3.5 | - | 4 | 4,135 | Nonfiction |
| Ulysses S. Grant | Falkof, Lucille | 1060 | 7.4 | NR | 8 | 29,373 | Nonfiction |
| Ulysses S. Grant | Kent, Zachary | N/A | 9.0 | NR | 6 | 12,036 | Nonfiction |
| Ulysses S. Grant | Riehecky, Janet | 1020 | 7.1 | S | 6 | 13,422 | Nonfiction |
| Ulysses S. Grant | Havelin, Kate | 1040 | 7.4 | W | 7 | 17,014 | Nonfiction |
| Umbrella | Yashima, Taro | 480 | 3.1 | K | 1 | 526 | Fiction |
| Umbrella Man & Other Stories | Dahl, Roald | 860 | 7.2 | NR | 17 | 76,000 | Fiction |
| Umbrella, The | Brett, Jan | 680 | 3.7 | L | 1 | 756 | Fiction |
| Umbrellas | Josephson, Judith Pinkerton | 960 | 4.8 | - | 4 | 5,328 | Nonfiction |
| Un Lun Dun | Mieville, China | 630 | 4.3 | V | 25 | 107,382 | Fiction |
| Unbeatable Beaks | Swinburne, Stephen R. | 770 | 2.9 | NR | 1 | 150 | Nonfiction |
| Unbroken | Haas, Jessie | 640 | 5.2 | NR | 12 | 47,722 | Fiction |
| Unbuilding | Macaulay, David | 1250 | 6.9 | NR | 4 | 4,281 | Fiction |
| Uncanny Can, The | Mecozzi, Maureen | 690 | 4.3 | - | 3 | 2,697 | Nonfiction |
| Uncertain Path, The | Watson, Jude | 550 | 4.5 | T | 8 | 26,380 | Fiction |
| Uncharted Waters | Bulion, Leslie | 620 | 3.5 | - | 11 | 44,706 | Fiction |
| Uncivil War, The | Klass, Sheila Solomon | 580 | 5.5 | NR | 9 | 31,777 | Fiction |
| Unclaimed Treasures | MacLachlan, Patricia | 620 | 5.5 | - | 5 | 21,660 | Fiction |
| Uncle Andy's | Warhola, James | 640 | 3.6 | M | 2 | 1,465 | Nonfiction |
| Uncle Arthur's Challenge | Spirn, Michele | 650 | 5.4 | - | 2 | 1,982 | Fiction |
| Uncle Blubbafink's Seriously.. | Graves, Keith | 330 | 4.1 | NR | 2 | 1,446 | Fiction |
| Uncle Daddy | Fletcher, Ralph | 490 | 4.2 | Q | 6 | 19,719 | Fiction |
| Uncle Daney's Way | Haas, Jessie | 730 | 5.2 | NR | 8 | 25,392 | Fiction |
| Uncle Elephant | Lobel, Arnold | 330 | 2.5 | J | 2 | 1,785 | Fiction |
| Uncle Farley's False Teeth | Walsh, Alice | 490 | 4.8 | - | 2 | 805 | Fiction |
| Uncle Foster's Hat Tree | Cushman, Doug | 180 | 3.4 | J | 2 | 985 | Fiction |
| Uncle Jed's Barbershop | Mitchell, Margaree King | 710 | 4.5 | P | 2 | 1,005 | Fiction |
| Uncle Montague's Tales Of Terr | Priestley, Chris | 900 | 6.2 | - | 12 | 43,530 | Fiction |
| Uncle Nacho's Hat/El sombrero | Rohmer, Harriet | 410 | 2.6 | M | 2 | 1,025 | Fiction |
| Uncle Peter's Amazing Chinese | Look, Lenore | 860 | 5.2 | U | 2 | 1,455 | Fiction |
| Uncle Rain Cloud | Johnston, Tony | 370 | 3.3 | NR | 2 | 1,264 | Fiction |
| Uncle Ronald | Doyle, Brian | 920 | 4.2 | NR | 8 | 30,915 | Fiction |
| Uncle Sam & Old Glory | West, Delno C. | 1130 | 7.8 | - | 3 | 3,933 | Nonfiction |
| Uncle Sam Wants You! | Whitman, Sylvia | 1050 | 7.5 | NR | 5 | 14,749 | Nonfiction |
| Uncle Vova's Tree | Polacco, Patricia | 850 | 3.6 | M | 2 | 1,600 | Fiction |
| Uncle Willie & Soup Kitchen | DiSalvo-Ryan, DyAnne | 450 | 3.1 | N | 2 | 1,905 | Fiction |
| Uncles | Schaefer, Lola M. | 270 | 1.3 | D | 1 | 36 | Nonfiction |
| Uncommon Traveler | Brown, Don | 550 | 3.3 | M | 2 | 1,263 | Nonfiction |
| Under A Different Sky | Savage, Deborah | 790 | 4.8 | NR | 16 | 69,547 | Fiction |
| Under A Stone | Green, Jen | 880 | 3.5 | - | 3 | 3,532 | Nonfiction |
| Under Alien Stars | Service, Pamela F. | 820 | 6.8 | NR | 10 | 47,514 | Fiction |
| Under Copp's Hill | Ayres, Katherine | 580 | 4.9 | P | 9 | 33,621 | Fiction |
| Under One Roof | Ada, Alma Flor | 570 | 3.3 | N | 2 | 1,182 | Fiction |
| Under Our Skin | Birdseye, Debbie Holsclaw | 650 | 3.5 | - | 2 | 3,773 | Nonfiction |
| Under The Banyan Tree | De Palma, Toni | 840 | 5.6 | - | 11 | 36,023 | Fiction |
| Under The Baseball Moon | Ritter, John H. | 750 | 4.3 | T | 16 | 59,199 | Fiction |
| Under The Black Ensign | Hubbard, L. Ron | 800 | 5.3 | - | 8 | 21,146 | Fiction |
| Under The Blood-Red Sun | Salisbury, Graham | 640 | 5.8 | W | 14 | 54,515 | Fiction |
| Under The Bridge | McKenzie, Ellen Kindt | 710 | 4.9 | - | 7 | 32,119 | Fiction |
| Under The Cat's Eye | Rubinstein, Gillian | 620 | 4.8 | NR | 12 | 46,978 | Fiction |
| Under The City | Kroll, Steven | 530 | 2.9 | M | 1 | 394 | Fiction |
| Under The Ground | Pluckrose, Henry | 450 | 3.7 | K | 1 | 277 | Nonfiction |
| Under The Ground: Hidden World | Jeunesse, Gallimard | 830 | 3.9 | N | 1 | 510 | Nonfiction |
| Under The Lemon Moon | Fine, Edith Hope | 520 | 4.8 | O | 2 | 1,238 | Fiction |
| Under The Mermaid Angel | Moore, Martha | 760 | 4.9 | NR | 8 | 37,384 | Fiction |
| Under The Ocean | Bennett, Paul | 1150 | 7.3 | NR | 5 | 6,056 | Nonfiction |
| Under The Quilt Of Night | Hopkinson, Deborah | 580 | 3.4 | N | 2 | 917 | Fiction |
| Under The Royal Palms | Ada, Alma Flor | 1070 | 6.1 | T | 6 | 15,357 | Nonfiction |
| Under The Royal Palms (Anth) | Ada, Alma Flor | 1100 | 6.1 | - | 2 | 1,763 | Nonfiction |
| Under The Same Sky | DeFelice, Cynthia | 750 | 4.3 | T | 13 | 51,771 | Fiction |
| Under The Sea | Chapman, Simon | 1150 | 9.5 | Z | 6 | 12,069 | Nonfiction |
| Under The Sea From A To Z | Doubilet, Anne | 1020 | 6.6 | - | 2 | 3,181 | Nonfiction |
| Under The Serpent Sea | Abbott, Tony | 450 | 3.1 | N | 5 | 11,462 | Fiction |
| Under The Shadow Of Wings | Banks, Sara Harrell | 720 | 4.8 | NR | 6 | 28,288 | Fiction |
| Under The Stars | Baglio, Ben M. | 660 | 4.1 | Q | 7 | 25,164 | Fiction |
| Under The Sunday Tree | Greenfield, Eloise | N/A | 4.7 | O | 2 | 1,320 | Fiction |
| Under The Water | Ziefert, Harriet | 580 | 2.2 | J | 1 | 366 | Nonfiction |
| Under Wraps | Goldish, Meish | 670 | 5.7 | V | 2 | 1,272 | Nonfiction |
| Under, Over, By The Clover | Cleary, Brian P. | 420 | 2.0 | NR | 1 | 199 | Fiction |
| Undercover | Kephart, Beth | 940 | 6.4 | - | 12 | 41,513 | Fiction |
| Undercover Kid: Tuna Surprise | Kidd, Ronald | 330 | 2.4 | K | 3 | 3,128 | Fiction |
| Undercover Tailback | Christopher, Matt | 570 | 5.1 | O | 4 | 19,833 | Fiction |
| Undercurrents | Roberts, Willo Davis | 780 | 4.5 | R | 12 | 49,923 | Fiction |
| Underdog | Sachs, Marilyn | N/A | 6.6 | - | 7 | 25,000 | Fiction |
| Underground | Macaulay, David | 1230 | 6.9 | NR | 4 | 8,227 | Nonfiction |
| Underground | Ferris, Jean | 770 | 4.7 | - | 11 | 38,719 | Fiction |
| Underground City, The | Pollard, Lauren Ray | 440 | 2.5 | K | 2 | 563 | Nonfiction |
| Underground Railroad, The | Stein, R. Conrad | 1030 | 6.5 | V | 3 | 3,573 | Nonfiction |
| Underground Railroad: Life... | Hansen, Ellen | 1200 | 6.2 | NR | 5 | 10,629 | Nonfiction |
| Underground, The | Applegate, K. A. | 540 | 5.2 | T | 9 | 28,297 | Fiction |
| Underground, The | Jenkins, Jerry B. | 510 | 5.1 | W | 7 | 18,790 | Fiction |
| Underneath, The | Appelt, Kathi | 830 | 5.4 | - | 13 | 55,737 | Fiction |
| Underrunners | Mahy, Margaret | 840 | 6.5 | NR | 9 | 42,147 | Fiction |
| Understand The Unknown | Applegate, K. A. | 810 | 6.1 | W | 10 | 32,943 | Fiction |
| Understanding Buddy | Kornblatt, Marc | 690 | 4.5 | - | 6 | 16,281 | Fiction |
| Understanding Horses (Anth) | Winkelaar, Peter R. | 1010 | 5.5 | - | 1 | 525 | Nonfiction |
| Understanding September 11th | Frank, Mitch | 1040 | 7.8 | W | 9 | 27,910 | Nonfiction |
| Understanding Your Brain | Treays, Rebecca | 920 | 5.9 | W | 4 | 7,864 | Nonfiction |
| Understanding Your Muscles | Treays, Rebecca | 890 | 4.2 | Q | 4 | 6,049 | Nonfiction |
| Understood Betsy | Fisher, Dorothy Canfield | 1000 | 6.3 | NR | 12 | 46,726 | Fiction |
| Undertaker's Gone Bananas, The | Zindel, Paul | 1050 | 5.2 | NR | 13 | 50,793 | Fiction |
| Underwater | Levy, Debbie | 810 | 4.5 | - | 10 | 32,672 | Fiction |
| Underwater Alphabet Book, The | Pallotta, Jerry | 590 | 4.3 | O | 2 | 1,523 | Nonfiction |
| Underwater Counting: Even... | Pallotta, Jerry | 730 | 2.9 | M | 2 | 1,059 | Fiction |
| Underwater Exploration | Vogel, Carole G. | 1150 | 8.9 | Y | 5 | 12,463 | Nonfiction |
| Underwater Musicians | Souza, D.M. | 940 | 4.8 | - | 3 | 3,139 | Nonfiction |
| Underwear! | Monsell, Mary Elise | 420 | 2.7 | K | 2 | 612 | Fiction |
| Underwood See, The | Lawrence, Michael | 1020 | 8.5 | - | 15 | 58,358 | Fiction |
| Undine | Russon, Penni | 800 | 8.3 | Y | 13 | 48,231 | Fiction |
| Undone! | Jennings, Paul | 360 | 3.8 | Q | 9 | 30,607 | Fiction |
| Undying Glory | Cox, Clinton | 1190 | 6.5 | U | 6 | 16,942 | Nonfiction |
| Unexpected | Williams, Laura E. | 700 | 4.2 | R | 17 | 64,011 | Fiction |
| Unexpected, The | Applegate, K. A. | 470 | 5.2 | T | 8 | 23,159 | Fiction |
| Unexplained Mysteries | Gunning, Thomas | N/A | 4.4 | NR | 3 | 10,000 | Nonfiction |
| Unfinished Dreams | Zalben, Jane Breskin | 700 | 5.8 | NR | 10 | 34,676 | Fiction |
| Unfinished Portrait Of Jessica | Peck, Richard | 780 | 5.6 | NR | 7 | 33,338 | Fiction |
| Unicorn And The Lake | Mayer, Marianna | 780 | 5.5 | - | 2 | 1,272 | Fiction |
| Unicorn Treasury, The | Coville, Bruce | 870 | 5.2 | S | 11 | 37,819 | Fiction |
| Unicorns Don't Give Sleigh... | Dadey, Debbie | 590 | 3.5 | M | 3 | 5,785 | Fiction |
| United Arab Emirates | Augustin, Byron | 990 | 6.8 | T | 7 | 19,200 | Nonfiction |
| United Arab Emirates | Sonneborn, Liz | 1000 | 8.5 | - | 7 | 16,569 | Nonfiction |
| United Kingdom (Visit To), The | Bell, Rachael | 610 | 2.9 | N | 2 | 693 | Nonfiction |
| United Kingdom in Pictures (Second Edition) | Campbell, Kumari | 1270 | 11.5 | T | 6 | 14,548 | Nonfiction |
| United Nations, The | Stein, R. Conrad | N/A | 6.9 | - | 3 | 3,381 | Nonfiction |
| United No More | Rappaport, Doreen | 780 | 4.5 | T | 8 | 22,042 | Nonfiction |
| United States (Fiesta!) | Hartman, Adrienne | N/A | 4.2 | - | 3 | 2,689 | Nonfiction |
| United States (Postcards From) | Allard, Denise | 410 | 3.5 | M | 2 | 780 | Nonfiction |
| United States Air Force | Zobel, Derek | 780 | 4.7 | - | 3 | 514 | Nonfiction |
| United States Air Force, The | Green, Michael | 650 | 3.5 | NR | 3 | 2,786 | Nonfiction |
| United States Army | David, Jack | 630 | 3.5 | - | 3 | 539 | Nonfiction |
| United States Army, The | Green, Michael | 670 | 3.5 | NR | 3 | 3,327 | Nonfiction |
| United States Coast Guard | David, Jack | 770 | 4.7 | - | 3 | 536 | Nonfiction |
| United States Coast Guard, The | Green, Michael | 720 | 3.5 | NR | 4 | 3,170 | Nonfiction |
| United States From A To Z, The | Kalman, Bobbie | 710 | 2.5 | - | 2 | 3,463 | Nonfiction |
| United States Holocaust... | Brooks, Philip | 1020 | 7.3 | W | 3 | 3,383 | Nonfiction |
| United States Marine Corps | Green, Michael | 690 | 3.5 | NR | 3 | 3,538 | Nonfiction |
| United States Marine Corps | David, Jack | 760 | 4.6 | - | 3 | 579 | Nonfiction |
| United States Marshals Service | Green, Michael | 630 | 6.8 | S | 3 | 2,891 | Nonfiction |
| United States Navy | David, Jack | 710 | 4.4 | - | 3 | 550 | Nonfiction |
| United States Navy, The | Green, Michael | 630 | 3.5 | NR | 3 | 2,812 | Nonfiction |
| United States Of America | Miller, Millie | 930 | 4.9 | NR | 3 | 5,849 | Nonfiction |
| United States Of America | Hintz, Martin | 1040 | 7.4 | T | 6 | 18,615 | Nonfiction |
| United States of America | Reynolds, Jeff | 810 | 4.8 | P | 3 | 2,955 | Nonfiction |
| United States Of America | Burgan, Michael | 1000 | 8.5 | - | 7 | 18,604 | Nonfiction |
| United States Of America (True | Petersen, Christine | 850 | 5.2 | N | 3 | 1,629 | Nonfiction |
| United States, The | Stevens, Kathryn | 860 | 5.6 | - | 2 | 1,758 | Nonfiction |
| United States/Pictures (c.1995 | Lerner, Geography Department | 1210 | 9.0 | NR | 5 | 13,552 | Nonfiction |
| United Tates Of America | Danziger, Paula | 640 | 4.1 | R | 9 | 28,046 | Fiction |
| Universe, The | Simon, Seymour | 980 | 5.5 | U | 2 | 2,190 | Nonfiction |
| Unknown, The | Applegate, K. A. | 570 | 5.4 | U | 9 | 28,292 | Fiction |
| Unlikely Friendship, An | Rinaldi, Ann | 740 | 5.3 | Y | 14 | 52,182 | Fiction |
| Unlikely Romance Of Kate... | Plummer, Louise | 730 | 5.8 | NR | 11 | 41,288 | Fiction |
| Unlucky Number Mystery, The | Wright, Bob | 280 | 1.6 | NR | 3 | 3,635 | Fiction |
| Unlucky Pony | Betancourt, Jeanne | 430 | 3.5 | O | 4 | 9,229 | Fiction |
| Unmaking Of Duncan Veerick | Levin, Betty | 640 | 3.7 | - | 14 | 50,336 | Fiction |
| Unmanned Aerial Vehicles | Hama, Larry | 900 | 5.7 | - | 3 | 3,804 | Nonfiction |
| Uno Dos Tres: One Two Three | Mora, Pat | N/A | 2.5 | G | 1 | 147 | Fiction |
| Unreal! | Jennings, Paul | 420 | 3.8 | Q | 9 | 30,391 | Fiction |
| Unresolved, The | Welsh, T.K. | 640 | 4.4 | W | 10 | 32,836 | Fiction |
| Unseen Rainbows, Silent Songs | Goodman, Susan E. | 900 | 4.9 | NR | 3 | 5,577 | Nonfiction |
| Unseen, The | Snyder, Zilpha Keatley | 990 | 6.8 | X | 14 | 51,288 | Fiction |
| Unsinkable! | Brimner, Larry Dane | 290 | 2.1 | H | 1 | 350 | Fiction |
| Unsolved Mysteries | Miller, J. C. | 620 | 3.5 | Q | 4 | 2,057 | Nonfiction |
| Unsolved! | Sullivan, George | 1000 | 7.7 | NR | 6 | 22,012 | Nonfiction |
| Unstoppable Me! | Dyer, Dr. Wayne W. | 770 | 4.7 | - | 2 | 1,845 | Nonfiction |
| Until Angels Close My Eyes | McDaniel, Lurlene | 600 | 5.9 | NR | 11 | 38,330 | Fiction |
| Until Whatever | Humphreys, Martha | 550 | 4.9 | NR | 8 | 31,434 | Fiction |
| Untold Tales | Brooke, William J. | N/A | 6.5 | - | 5 | 28,000 | Fiction |
| Unusual Bridges | Goldstone, Bruce | 890 | 5.3 | - | 2 | 1,604 | Nonfiction |
| Unusual Show, An | Blonder, Ellen | BR | 1.3 | E | 1 | 63 | Fiction |
| Unusual Suspects, The | Buckley, Michael | 840 | 4.5 | R | 13 | 57,148 | Fiction |
| Unvisibles, The | Whybrow, Ian | 1020 | 5.2 | T | 11 | 45,129 | Fiction |
| Unwilling Umpire, The | Roy, Ron | 520 | 2.7 | N | 3 | 9,108 | Fiction |
| Unwind | Shusterman, Neal | 740 | 4.5 | - | 23 | 95,412 | Fiction |
| Up A Rainforest Tree | Telford, Carole | 820 | 3.7 | M | 3 | 2,037 | Nonfiction |
| Up A Road Slowly | Hunt, Irene | 1130 | 7.8 | NR | 13 | 49,886 | Fiction |
| Up And Down | Murphy, Patricia J. | 490 | 1.9 | G | 1 | 222 | Nonfiction |
| Up And Down On The Merry-Go-Ro | Martin Jr., Bill | 910 | 3.8 | - | 1 | 288 | Fiction |
| Up And Down Spring | Hurwitz, Johanna | 650 | 5.1 | - | 6 | 15,873 | Fiction |
| Up Close | Gikow, Louise A. | 740 | 4.0 | N | 3 | 2,647 | Nonfiction |
| Up Close: Ella Fitzgerald | Stone, Tanya Lee | 1070 | 9.6 | - | 9 | 29,871 | Nonfiction |
| Up Close: Elvis Presley | Hampton, Wilborn | 1120 | 9.5 | - | 10 | 31,045 | Nonfiction |
| Up Close: Frank Lloyd Wright | Adkins, Jan | 1030 | 8.6 | - | 13 | 46,688 | Nonfiction |
| Up Close: John Steinbeck | Meltzer, Milton | 1020 | 8.6 | - | 11 | 36,499 | Nonfiction |
| Up Close: Johnny Cash | Neimark, Anne E. | 1100 | 10.4 | - | 9 | 28,917 | Nonfiction |
| Up Close: Oprah Winfrey | Cooper, Ilene | 1110 | 10.5 | - | 10 | 30,001 | Nonfiction |
| Up Close: Rachel Carson | Levine, Ellen | 1060 | 9.5 | - | 10 | 31,204 | Nonfiction |
| Up Close: Robert F. Kennedy | Aronson, Marc | 1030 | 7.6 | - | 11 | 35,527 | Nonfiction |
| Up Close: Thurgood Marshall | Crowe, Chris | 1260 | 10.4 | - | 11 | 34,364 | Nonfiction |
| Up From Jericho Tel | Konigsburg, E. L. | 910 | 6.1 | NR | 10 | 46,213 | Fiction |
| Up In The Air | Hart, Philip S. | 950 | 6.8 | NR | 4 | 10,748 | Nonfiction |
| Up In The Air | Livingston, Myra Cohn | N/A | 2.3 | M | 1 | 312 | Fiction |
| Up In The Sky | Lynch, Patricia Ann | 440 | 2.6 | K | 1 | 536 | Nonfiction |
| Up North At The Cabin | Chall, Marsha Wilson | N/A | 4.7 | O | 2 | 570 | Fiction |
| Up On Cloud Nine | Fine, Anne | 700 | 5.7 | U | 10 | 33,986 | Fiction |
| Up On Daddy's Shoulders | Berry, Matt | 670 | 2.4 | K | 1 | 141 | Fiction |
| Up The Learning Tree | Vaughan, Marcia | 660 | 4.2 | Q | 3 | 1,842 | Fiction |
| Up To Low | Doyle, Brian | 870 | 4.7 | NR | 6 | 20,518 | Fiction |
| Up, Up And Away | Heller, Ruth | 480 | 3.1 | NR | 1 | 437 | Nonfiction |
| Up, Up, And Away | Hillert, Margaret | BR | 1.5 | NR | 1 | 375 | Fiction |
| Up, Up, And Away: The Story... | Canizares, Susan | BR | 1.3 | F | 1 | 42 | Nonfiction |
| Up, Up, Down | Munsch, Robert | 180 | 1.6 | E | 1 | 461 | Fiction |
| Upchuck And The Rotten Willy | Wallace, Bill | 600 | 4.2 | Q | 4 | 17,607 | Fiction |
| Uphill Downhill Race, The | Lakin, Patricia | 690 | 4.3 | - | 2 | 1,541 | Nonfiction |
| Uplink From The Underground | Jenkins, Jerry B. | 610 | 5.1 | W | 8 | 24,777 | Fiction |
| Upon The Head Of The Goat | Siegal, Aranka | 830 | 5.6 | NR | 15 | 61,949 | Nonfiction |
| Uprising | Haddix, Margaret Peterson | 790 | 5.2 | - | 20 | 84,361 | Fiction |
| Upside Down | Riley, Gail Blasser | BR | 1.8 | H | 1 | 90 | Fiction |
| Upside Down Boy, The | Herrera, Juan Felipe | 450 | 2.9 | - | 2 | 1,184 | Nonfiction |
| Upside-Down Elephant, The | Hirano, Yoko Mia | 220 | 2.1 | H | 1 | 384 | Fiction |
| Upstairs Mouse | Yee, Wong Herbert | 510 | 2.7 | L | 3 | 1,841 | Fiction |
| Upstairs Room, The | Reiss, Johanna | 380 | 5.9 | NR | 12 | 44,067 | Nonfiction |
| Upstate Autumn | Mannheimer, Jed | 580 | 3.2 | M | 2 | 1,370 | Fiction |
| Uptown | Collier, Bryan | 420 | 2.7 | NR | 1 | 283 | Fiction |
| Uranus | Simon, Seymour | 1080 | 5.1 | - | 2 | 1,242 | Nonfiction |
| Uranus | Taylor-Butler, Christine | 480 | 2.6 | - | 1 | 215 | Nonfiction |
| Uranus | Landau, Elaine | 800 | 5.3 | P | 2 | 2,604 | Nonfiction |
| Uranus (Galaxy) | Vogt, Gregory L. | 670 | 2.5 | O | 3 | 1,424 | Nonfiction |
| Uranus (Scholastic News) | Taylor-Butler, Christine | 440 | 2.1 | I | 1 | 226 | Nonfiction |
| Uranus (True Book) | Brimner, Larry Dane | N/A | 4.5 | L | 3 | 1,366 | Nonfiction |
| Uranus (Watts Library) | Stewart, Melissa | 1020 | 9.0 | S | 3 | 5,264 | Nonfiction |
| Urban Roosts | Bash, Barbara | 1080 | 4.5 | P | 2 | 1,691 | Nonfiction |
| Urban Roosts (Anthology) | Bash, Barbara | 1040 | 4.1 | - | 2 | 1,509 | Nonfiction |
| Urchin And The Heartstone | McAllister, M. I. | 870 | 5.7 | - | 18 | 72,596 | Fiction |
| Urchin Of The Riding Stars | McAllister, M. I. | 780 | 5.4 | - | 17 | 66,739 | Fiction |
| Uruguay In Pictures (c.1987) | Lerner, Geography Department | 1310 | 9.0 | NR | 6 | 13,509 | Nonfiction |
| Us And Uncle Fraud | Lowry, Lois | 760 | 4.5 | S | 7 | 31,646 | Fiction |
| USA From Space | Fallen, Anne-Catherine | 1090 | 6.2 | NR | 3 | 6,696 | Nonfiction |
| Usborne Book - Ancient World | Chisholm, Jane | 960 | 7.2 | NR | 20 | 88,500 | Nonfiction |
| Usborne Book Of Amazing Feats | Ganeri, Anita | 910 | 4.9 | S | 6 | 11,534 | Nonfiction |
| Usborne Book Of Animal Facts | Ganeri, Anita | 960 | 5.3 | W | 3 | 11,078 | Nonfiction |
| Usborne Book Of Cutaway Cars | Gifford, Clive | 930 | 5.4 | NR | 4 | 8,382 | Nonfiction |
| Usborne Book Of Explorers... | Everett, Felicity | 1060 | 6.9 | NR | 7 | 15,756 | Nonfiction |
| Usborne Book Of Hair, The | Wingate, Philippa | 930 | 5.3 | Q | 4 | 6,991 | Nonfiction |
| Usborne Book Of Inventors... | Reid, Struan | 1010 | 5.7 | W | 5 | 16,798 | Nonfiction |
| Usborne Book Of Racing Cars | Gifford, Clive | 640 | 4.9 | P | 3 | 4,445 | Nonfiction |
| Usborne Book Of Scientists... | Reid, Struan | 1100 | 7.5 | NR | 6 | 19,161 | Nonfiction |
| Usborne Book Of Space Facts | Reid, Struan | 1080 | 6.3 | NR | 4 | 10,242 | Nonfiction |
| Usborne Mysteries - Plant Life | Cork, Barbara | 980 | 4.6 | S | 4 | 5,135 | Nonfiction |
| Usborne Mysteries / Science | Clarke, Phillip | 1120 | 5.7 | V | 6 | 15,374 | Nonfiction |
| Usborne Mysteries- Insect Life | Owen, Jennifer | 1010 | 6.3 | - | 3 | 5,061 | Nonfiction |
| Usborne Mysteries-Animal World | Goaman, Karen | 990 | 4.9 | R | 3 | 4,709 | Nonfiction |
| Usborne Mysteries-Reptile | Spellerberg, Ian | 1160 | 5.8 | - | 3 | 6,304 | Nonfiction |
| Usborne...Astronomy & Space | Miles, Lisa | 920 | 6.1 | NR | 4 | 10,368 | Nonfiction |
| Usborne...Famous Women | Dungworth, Richard | 1060 | 7.5 | NR | 5 | 16,811 | Nonfiction |
| Use Your Noodle Tales | Jones, Jan | 750 | 5.8 | U | 2 | 1,895 | Fiction |
| Uses For Mooses &-Popular Pets | Thaler, Mike | 420 | 2.1 | H | 1 | 173 | Fiction |
| Using Science To Play Baseball | North, Emily | 1010 | 4.1 | M | 2 | 1,022 | Nonfiction |
| USS Arizona, The | Stein, R. Conrad | 940 | 5.8 | - | 3 | 3,283 | Nonfiction |
| Utah | Fradin, Dennis Brindell | 620 | 4.9 | - | 3 | 6,260 | Nonfiction |
| Utah | Trueit, Trudi Strain | 690 | 4.3 | I | 1 | 357 | Nonfiction |
| Utah (America-Beautiful-2) | Kent, Deborah | N/A | 9.0 | Z | 6 | 12,948 | Nonfiction |
| Utah (Hello U.S.A.) | Sirvaitis, Karen | 920 | 3.5 | - | 2 | 4,973 | Nonfiction |
| Utah (Neri) | Neri, P.J. | 940 | 5.7 | U | 4 | 10,011 | Nonfiction |
| Utah (One Nation) | Kummer, Patricia K. | 580 | 4.3 | NR | 3 | 2,949 | Nonfiction |
| Utah Jazz Story, The | Rambeck, Richard | 960 | 4.5 | - | 3 | 4,154 | Nonfiction |
| Utahraptor: Deadliest Dinosaur | Lessem, Don | 1120 | 5.5 | - | 3 | 3,114 | Nonfiction |
| Utes, The | Flanagan, Alice K. | 940 | 6.6 | N | 3 | 1,199 | Nonfiction |
| Utterly Me, Clarice Bean | Child, Lauren | 900 | 5.6 | U | 6 | 20,036 | Fiction |
| Utterly Yours, Booker Jones | Duffey, Betsy | 610 | 5.8 | S | 5 | 21,189 | Fiction |
|