Stonington is an unincorporated community in eastern Baca County, Colorado, United States.

[1] Stonington lies east of the Comanche National Grassland and is the southeasternmost community in Colorado.

The Stonington post office operated from 1888 until 1992.

[3][4] Stonington addresses are now served by the Walsh post office with the ZIP code 81090.

On May 17, 1962, an F1 tornado hit Stonington, destroying several farms.