Miami County (county code MI) is a county located in east-central Kansas and is part of the Kansas City metropolitan area. As of the 2010 census, the county population was 32,787. Its county seat and most populous city is Paola.
According to the U.S. Census Bureau, the county has a total area of 590 square miles (1,500 km), of which 576 square miles (1,490 km) is land and 15 square miles (39 km) (2.5%) is water.
Miami County is included in the Kansas City, MO-KS Metropolitan Statistical Area.
As of the 2000 census, there were 28,351 people, 10,365 households, and 7,794 families residing in the county. The population density was 49 people per square mile (19/km²). There were 10,984 housing units at an average density of 19 per square mile (7/km²). The racial makeup of the county was 95.96% White, 1.54% Black or African American, 0.52% Native American, 0.17% Asian, 0.01% Pacific Islander, 0.44% from other races, and 1.36% from two or more races. Hispanic or Latino of any race were 1.59% of the population.
There were 10,365 households out of which 37.00% had children under the age of 18 living with them, 63.50% were married couples living together, 8.00% had a female householder with no husband present, and 24.80% were non-families. 21.00% of all households were made up of individuals and 8.80% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.09.
In the county, the population was spread out with 27.90% under the age of 18, 7.30% from 18 to 24, 29.70% from 25 to 44, 23.10% from 45 to 64, and 11.90% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 97.80 males. For every 100 females age 18 and over, there were 96.00 males.
The median income for a household in the county was $46,665, and the median income for a family was $55,830. Males had a median income of $37,441 versus $27,271 for females. The per capita income for the county was $21,408. About 3.60% of families and 5.50% of the population were below the poverty line, including 5.40% of those under age 18 and 8.40% of those age 65 or over.