Baca County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 3,506. The county seat is Springfield. Located at the southeast corner of Colorado, the county shares state borders with Kansas, New Mexico, and Oklahoma. CountryUnited States State Colorado FoundedApril 16, 1889 Named for Felipe Baca Seat Springfield Largest town Springfield • Total2,557 sq mi (6,620 km2) • Land2,555 sq mi (6,620 km2) • Water2.4 sq mi (6 km2) 0.09%%Po