Segundo is an unincorporated community and a census-designated place (CDP) located in and governed by Las Animas County, Colorado, United States.

[4] Segundo was founded by Colorado Fuel and Iron (CF&I) as a company town to house its workers for a local coal mine.

[5] CF&I offered adequate housing for the time, and promoted upward mobility through its sponsorship of a YMCA center, an elementary school, small businesses, and a company store.

Segundo was a prosperous town until the 1920s, when the population began to decline due to constant health issues related to air pollution and outdated housing that lacked indoor plumbing.

Declines in demand for metallurgical coke led to workers being laid off and, following a major fire in 1929, CF&I ceased their operations in Segundo.