| Title | Author | Book Level | Point Level |
| One Morning in Maine | McCloskey, Robert | 4.4 | 0.5 |
| One of the Third Grade Thonkers | Naylor, Phyllis Reynolds | 5.1 | 4.0 |
| One of Three | Johson, Angela | 2.4 | 0.5 |
| One Small Blue Bead | Baylor, Bryd | 4.0 | 0.5 |
| Onion John | Krumgold, Joseph | 4.5 | 8.0 |
| Onion Tears | Kidd, Diana | 4.2 | 1.0 |
| Only One Woof | Herriot, James | 4.5 | 0.5 |
| Ooey Gooey | Mayer/Farber/Sansevere | 2.0 | 0.5 |
| Operation Siberian Crane | Friedman, Judi | 7.1 | 2.0 |
| Oregon | Fradin, Dennis/Judith | 4.4 | 1.0 |
| Oregon Facts and Symbols | McAuliffe, Emily | 3.9 | 0.5 |
| Original Monster Truck: Bigfoot, The | Johnson, Scott | 4.4 | 0.5 |
| Orphan Train Rider: One Boy's True Story | Warren, Andrea | 6.1 | 2.0 |
| Oscar, Cat-About-Town | Herriot, James | 4.0 | 0.5 |
| Oscar Otter | Benchley, Nathaniel | 2.6 | 0.5 |
| Otherwise Known as Sheila the Great | Blume, Judy | 3.5 | 4.0 |
| Our Solar System | Davis, Amanda | 4.2 | 0.5 |
| Our Teacher's Having a Baby | Busting, Eve | 2.6 | 0.5 |
| Our of Darkness: The Story Behind Loius | Freedman, Russell | 6.7 | 2.0 |
| Out of Nowhere | Sebestyen, Ouida | 4.5 | 6.0 |
| Out of the Silent Planet | Lewis, C.S. | 7.4 | 10.0 |
| Outlaw Red | Kjelgaard, Jim | 6.6 | 8.0 |
| Outside and Inside Trees | Markle, Sandra | 5.2 | 0.5 |
| Outstanding Outsides | Machotka, Hana | 4.9 | 0.5 |
| Over and Over | Zolotow, Charlotte | 3.9 | 0.5 |
| Over Sea, Under Stone | Cooper, Susan | 5.4 | 12.0 |
| Over the Green Hills | Isadora, Rachel | 2.9 | 0.5 |
| Over the Top of the World: Explorer | Steger/Bowermaster | 6.0 | 2.0 |
| Overnight, The | Stine, R.L. | 3.9 | 5.0 |
| Owl and the Pussycat, The | Lear, Edward | 2.5 | 0.5 |
| Owl at Home | Lobel, Arnold | 2.7 | 0.5 |
| Owl Moon | Yolen, Jane | 3.2 | 0.5 |
| Owls in the Family | Mowat, Farley | 5.0 | 3.0 |
| Ox-Cart Man | Hall, Donald | 4.5 | 0.5 |
| Ozone Hole, The | Stille, Darlene | 5.1 | 0.5 |
| P.J. Funny Bunny Camps Out | Sadler, Marilyn | 1.7 | 0.5 |
| P.J. the Spoiled Bunny | Sadler, Marilyn | 2.8 | 0.5 |
| Pacific Ocean, The | Heinrichs, S. | 3.8 | 0.5 |
| Paddington at Larger | Bond, Michael | 6.0 | 4.0 |
| Pain and The Great One, The | Blume, Judy | 3.1 | 0.5 |
| Painters of the Caves | Lauber, Patricia | 5.8 | 1.0 |
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