Putnam County is a county located in North Central Missouri. As of the 2010 census, the population was 4,979. Its county seat is Unionville. The county was organized February 28, 1845 and named for Israel Putnam, a hero in the French and Indian War and a general in the American Revolutionary War.
According to the U.S. Census Bureau, the county has a total area of 520 square miles (1,300 km), of which 517 square miles (1,340 km) is land and 2.3 square miles (6.0 km) (0.4%) is water.
As of the census of 2010, there were 4,979 people, 2,228 households, and 1,517 families residing in the county. The population density was 10 people per square mile (4/km²). There were 2,914 housing units at an average density of 6 per square mile (2/km²). The racial makeup of the county was 99.14% White, 0.06% Black or African American, 0.10% Native American, 0.13% Asian, 0.10% from other races, and 0.48% from two or more races. Approximately 0.61% of the population were Hispanic or Latino of any race.
There were 2,228 households out of which 27.90% had children under the age of 18 living with them, 57.20% were married couples living together, 7.20% had a female householder with no husband present, and 31.90% were non-families. 28.70% of all households were made up of individuals and 15.90% had someone living alone who was 65 years of age or older. The average household size was 2.32 and the average family size was 2.83.
In the county, the population was spread out with 24.00% under the age of 18, 6.20% from 18 to 24, 24.00% from 25 to 44, 25.10% from 45 to 64, and 20.70% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 96.10 males. For every 100 females age 18 and over, there were 91.90 males.
The median income for a household in the county was $26,282, and the median income for a family was $32,031. Males had a median income of $22,957 versus $18,884 for females. The per capita income for the county was $14,647. About 13.20% of families and 16.00% of the population were below the poverty line, including 20.60% of those under age 18 and 12.80% of those age 65 or over.