This is a list of U.S. state dinosaurs in the United States, including the District of Columbia. Many states also have dinosaurs as state fossils, or designate named avian dinosaurs (List of U.S. state birds), but this list only includes those that have been officially designated as "state dinosaurs".

State or Territory	Dinosaur	Image	Year
Arizona	Sonorasaurus thompsoni		2018[1]
Arkansas	Arkansaurus fridayi		2017[2]
California	Augustynolophus morrisi		2017[3]
Colorado	Stegosaurus sp.		1982[4]
Connecticut	Dilophosaurus sp.		2017-07-10[5]
Delaware	Dryptosaurus aquilunguis		2022[6][7]
District of Columbia	"Capitalsaurus"		1998[8]
Idaho	Oryctodromeus cubicularis		2023[9]
Massachusetts	Podokesaurus holyokensis		2021[10][11]
Maryland	Astrodon johnstoni		1998[12]
Missouri	Parrosaurus missouriensis		2004[13][14]
New Jersey	Hadrosaurus foulkii		1991[15]
Oklahoma	Acrocanthosaurus atokensis		2006[16]
Texas	Sauroposeidon proteles (originally Paluxysaurus jonesi)		2009 (replaced Pleurocoelus which was state dinosaur 1997–2009)[17]
Utah	Utahraptor ostrommaysorum		2018[18]
Washington	"Suciasaurus rex"		2023[19]
Wyoming	Triceratops horridus		1994[20]

This is for dinosaurs that were or are candidates for state dinosaur but either were not designated or have yet to officially be.

State	Dinosaur	Image	Year	Result
Arizona	Dilophosaurus wetherilli		1998[21][22]	Vetoed when it was revealed fossils were illegally taken from Navajo Nation[23]
Massachusetts	Anchisaurus polyzelus		2021[24]	Lost to Podokesaurus in a poll taken prior to bill[10]

• List of U.S. state birds
• List of U.S. state fossils
• Lists of U.S. state insignia

• "The sort of official state dinosaur page. Dinosaur Interplanetary Gazette. (note that the list includes both "state dinosaurs" and "state fossils")