[8][9] Martin County is included in the Midland–Odessa combined statistical area.

[10] The northern portion of the Spraberry Trend, the second-largest oil field in the United States by 2013 estimated crude oil production, underlies much of the county.

[11] As of the census[17] of 2000, there were 4,746 people, 1,624 households, and 1,256 families residing in the county.

There were 1,624 households, out of which 42.70% had children under the age of 18 living with them, 64.30% were married couples living together, 9.50% had a female householder with no husband present, and 22.60% were non-families.

21.70% of all households were made up of individuals, and 11.80% had someone living alone who was 65 years of age or older.