Converse, a banker and rancher from Cheyenne, Wyoming, who was co-owner with Francis E. Warren in a large ranch in the eastern part of Converse County.

[5] As of the 2000 United States Census,[9] there were 12,052 people, 4,694 households, and 3,407 families in the county.

The racial makeup of the county was 94.72% White, 0.15% Black or African American, 0.91% Native American, 0.27% Asian, 0.02% Pacific Islander, 2.46% from other races, and 1.47% from two or more races.

There were 4,694 households, out of which 36.50% had children under the age of 18 living with them, 60.60% were married couples living together, 8.40% had a female householder with no husband present, and 27.40% were non-families.

23.40% of all households were made up of individuals, and 9.00% had someone living alone who was 65 years of age or older.

As of the 2010 United States Census, there were 13,833 people, 5,673 households, and 3,860 families in the county.

[11] The racial makeup of the county was 95.1% white, 0.8% American Indian, 0.3% black or African American, 0.3% Asian, 0.1% Pacific islander, 1.7% from other races, and 1.7% from two or more races.

[10] In terms of ancestry, 36.8% were German, 19.8% were Irish, 18.0% were English, and 6.2% were American.

[13] Like most of Wyoming, Converse County is overwhelmingly Republican.