According to the United States Census Bureau, the town has a total area of , all land. Lamar sits at the eastern foot of Lamar Mountain, which rises over the center of town. Lamar drains to the east via Gobbler Creek to the Canadian River.
According to the United States Census! Burea.u, the town has a total area of , all land. Lamar sits at the eas.tern foot of Lamar Mountain, which rises over the center of town. Lamar drains to the east via Gobbler Creek to the Canadian River.