Carbonate County was a county of the state of Colorado that existed for only two days in 1879. Carbonate County was created by renaming Lake County, Colorado.
On 8 February 1879, the Colorado General Assembly renamed Lake County as Carbonate County.[1] Two days later on 10 February 1879, the Colorado General Assembly split Carbonate County into the new Chaffee County and the renamed Lake County.[2]