Colex County was created in 1897 from parts of Marico and Marvyn counties where a large number of "Colexians" lived. Montgomery was chosen as the county seat in 1898. In 1923, residents wanted to rename the county seat "Colex City". The name was changed in 1924, but the name was changed back to "Montgomery" in 1927.
Colex County is located in the Central Plains region of the state.
- Dragoonasag National Route 124
- Dragoonasag National Route 731
- Lohana State Route 99
- Lohana State Route 127
- Lohana State Route 215
- Lohana State Route 262
- Lohana State Route 531
- Lohana State Route 558
- Marico County (northwest)
- Balynwood County (southwest and south)
- Friedman County (south and southeast)
- Marvyn County (east)
- Wyssoneau County (northeast)
Colex County had a population of about 21,267 at the last census. Caucasians made up 87% of the population; Africans made up 9%; and Hispanics made up 4%. Colex County was the only Lohana county that had no Parkufo residents. About 52% of the county's population belonged to the "Colexian community" founded by the person for whom the county is named.