[4] The highest point in Mineral County is Mount Grant at 11,285 ft (3,440 m).

At the 2000 census there were 5,071 people, 2,197 households, and 1,379 families living in the county.

The racial makeup of the county was 73.9% White, 4.8% Black or African American, 15.5% Native American, 0.8% Asian, 0.1% Pacific Islander, 2.7% from other races, and 2.4% from two or more races.

[10] Of the 2,197 households 25.40% had children under the age of 18 living with them, 45.20% were married couples living together, 11.50% had a female householder with no husband present, and 37.20% were non-families.

At the 2010 census, there were 4,772 people, 2,240 households, and 1,258 families living in the county.

There were 2,830 housing units at an average density of 0.8 per square mile (0.31/km2).

[12] The racial makeup of the county was 72.5% white, 15.5% Native American, 4.1% black or African American, 1.1% Asian, 0.1% Pacific islander, 2.1% from other races, and 4.4% from two or more races.

[11] In terms of ancestry, 23.8% were English, 18.5% were German, 13.8% were Irish, 9.3% were Scottish, 5.2% were Portuguese, and 3.7% were American.