Boncarbo, Colorado
Boncarbo is an unincorporated community and U.S. Post Office in Las Animas County, Colorado, United States. The ZIP Code of the Boncarbo Post Office is 81024. History. The town of Boncarbo was established by the American Smelting and Refining Company in 1915. Boncarbo is a corruption of the French "bon carbon", meaning "good coal". The Boncarbo Post Office opened on November 15, 1917. Most of the coal mined at Boncarbo was sent to Cokedale for coking. Geography. Boncarbo is located at (37.216249,-104.695587).