Monroe County is a county in northeast Missouri. As of the 2010 census, the population was 8,840. Its county seat is Paris.
According to the U.S. Census Bureau, the county has a total area of 670 square miles (1,700 km), of which 648 square miles (1,680 km) is land and 23 square miles (60 km) (3.4%) is water.
As of the census of 2010, there were 8,840 people, 3,656 households, and 2,566 families residing in the county. The population density was 14 inhabitants per square mile (5.4/km). There were 4,565 housing units at an average density of 7 per square mile (2.7/km). The racial makeup of the county was 94.66% White, 3.83% Black or African American, 0.41% Native American, 0.12% Asian, 0.03% Pacific Islander, 0.16% from other races, and 0.78% from two or more races. Approximately 0.56% of the population were Hispanic or Latino of any race. 24.7% were of German, 23.2% American, 14.2% English and 11.8% Irish ancestry.
There were 3,656 households out of which 31.60% had children under the age of 18 living with them, 59.10% were married couples living together, 7.70% had a female householder with no husband present, and 29.80% were non-families. 26.50% of all households were made up of individuals and 12.90% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.02.
In the county, the population was spread out with 25.90% under the age of 18, 7.30% from 18 to 24, 25.00% from 25 to 44, 24.20% from 45 to 64, and 17.60% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 96.40 males. For every 100 females age 18 and over, there were 93.10 males.
The median income for a household in the county was $30,871, and the median income for a family was $36,895. Males had a median income of $26,534 versus $20,440 for females. The per capita income for the county was $14,695. About 8.30% of families and 11.90% of the population were below the poverty line, including 14.00% of those under age 18 and 10.30% of those age 65 or over.