[3] Davis County is included in the Ottumwa, IA Micropolitan Statistical Area.

94.98% were non-Hispanic White, 0.09% were Black, 1.58% were Hispanic, 0.12% were Native American, 0.16% were Asian, 0.00% were Native Hawaiian or Pacific Islander and 3.06% were some other race or more than one race.

[13] As of the census[14] of 2000, there were 8,541 people, 3,207 households, and 2,286 families residing in the county.

The racial makeup of the county was 98.35% White, 0.18% Black or African American, 0.21% Native American, 0.20% Asian, 0.05% Pacific Islander, 0.21% from other races, and 0.81% from two or more races.

25.00% of all households were made up of individuals, and 13.80% had someone living alone who was 65 years of age or older.

Davis County contains the largest Amish population in Iowa with 1,860 members recorded as of 2024.