| State | Dinosaur | Year | Type |
| Arizona | Sonorasaurus thompsoni | 2018 |  |
| Arkansas | Arkansaurus fridayi | 2017 |  |
| California | Augustynolophus morrisi | 2017 |  |
| Colorado | Stegosaurus armatus | 1982 |  |
| Connecticut | Dilophosaurus | 2017 | |
| Delaware | Dryptosaurus aquilunguis | 2022 | |
| D. C. | "Capitalsaurus" | 1998 | |
| Idaho | Oryctodromeus cubicularis | 2023 | |
| Massachusetts | Podokesaurus holyokensis | 2021 | |
| Maryland | Astrodon johnstoni | 1998 | |
| Missouri | Hypsibema missouriensis | 2004 | |
| New Jersey | Hadrosaurus foulki | 1991 | |
| Oklahoma | Acrocanthosaurus atokensis | 2006 | |
| Texas | Sauropoiseidon proteles (previously Paluxysaurus jonesi) | 2009 | |
| Utah | Utahraptor ostrommaysorum | 2018 | |
| Washington State | "Suciasaurus rex" | 2023 | |
| Wyoming | Triceratops horridus | 1994 |  |
*Note: before Paluxysaurus (1997), the Texas State dinosaur was Pleurocoelus, which turned out to be synonymous with Astrodon that Maryland had already adopted. Unfortunately, for Texas, Paluxysaurus turned out to be a synonym of Sauroposeidon.
U.S. State Fossils (dinosaur)
| State | Dinosaur | Year | Type |
| Montana | Maiasaura peeblesorum | 1985 | |
| New Mexico | Coelophysis bauri | 1981 | |
| Oklahoma | Saurophaganax maximus | 2000 | |
| South Dakota | Triceratops horridus | 1988 | |
| Utah | Allosaurus fragilis | 1988 | |
