Las Animas is the statutory city that is the county seat, the most populous community, and the only incorporated municipality in Bent County, C…Las Animas is the statutory city that is the county seat, the most populous community, and the only incorporated municipality in Bent County, Colorado, United States. The city population was 2,300 at the 2020 United States Census. Las Animas is located on the Arkansas River, just west of its confluence with the Purgatoire River, in southeast Colorado east of Pueblo, near the historic Bent's Fort.