[citation needed] As of the 2010 census, there were 7,027 people, 2,466 households, and 1,582 families in the county.

The racial makeup of the county was 92.4% white, 4.4% American Indian, 1.0% black or African American, 0.5% Asian, 0.4% from other races, and 1.3% from two or more races.

In terms of ancestry, 27.9% were German, 19.1% were Irish, 14.6% were English, 8.5% were Norwegian, and 4.7% were American.

The current Montana State Prison facility is located in an unincorporated area in the county, near Deer Lodge.

[10] Powell County voters have supported Republican Party candidates in every national election since 1964.