Jackson County is located in the western portion of the U.S. state of Missouri. As of the 2010 census, the population was 674,158. making it the second-most populous county in the state (after St. Louis County). Although Independence retains its status as the original county seat, Kansas City serves as a second county seat and the center of county government. The county was organized December 15, 1826, and named for President Andrew Jackson (elected 1828). Jackson County is the most populated county in the Kansas City metropolitan area.
According to the U.S. Census Bureau, the county has a total area of 616 square miles (1,600 km), of which 604 square miles (1,560 km) is land and 12 square miles (31 km) (1.9%) is water.
The Missouri River comprises Jackson County’s northern border (with the exception of one small portion north of the river around the intersection of Highways 210 and 291 as well as all of the 291 bridge). The county has historically been a major traveling point for American river travel.
As of the 2010 census Jackson County had a population of 674,158. The racial and ethnic makeup of the population was 63.3% non-Hispanic white, 23.7% non-Hispanic black, 0.5% Native American, 1.6% Asian, 0.4% Pacific Islander alone or in combination with one or more other races, 0.1% non-Hispanic from some other race, 3.8% reporting two or more races and 8.4% Hispanic or Latino.
As of the census of 2000, there were 654,880 people, 266,294 households, and 166,167 families residing in the county. The population density was 1,083 people per square mile (418/km²). There were 288,231 housing units at an average density of 476 per square mile (184/km²). The racial makeup of the county was 70.10% White, 23.27% Black or African American, 0.48% Native American, 1.28% Asian, 0.18% Pacific Islander, 2.43% from other races, and 2.25% from two or more races. 5.37% of the population were Hispanic or Latino of any race. 16.7% were of German, 9.1% American, 8.9% Irish and 8.8% English ancestry.
There were 266,294 households out of which 29.90% had children under the age of 18 living with them, 43.40% were married couples living together, 14.70% had a female householder with no husband present, and 37.60% were non-families. 31.20% of all households were made up of individuals and 9.90% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 3.05.
In the county, the population was spread out with 25.80% under the age of 18, 9.10% from 18 to 24, 31.10% from 25 to 44, 21.50% from 45 to 64, and 12.50% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 92.90 males. For every 100 females age 18 and over, there were 89.00 males.
The median income for a household in the county was $39,277, and the median income for a family was $48,435. Males had a median income of $35,798 versus $27,403 for females. The per capita income for the county was $20,788. About 9.00% of families and 11.90% of the population were below the poverty line, including 16.40% of those under age 18 and 8.70% of those age 65 or over.
According to the Association of Religion Data Archives County Membership Report (2010), Jackson County is sometimes regarded as being on the northern edge of the Bible Belt, with evangelical Protestantism being the most predominant religion. The most predominant denominations among residents in Jackson County who adhere to a religion are Roman Catholics (19.51%), Southern Baptists (17.96%), and non-denominational evangelical Christians (11.52%).