Wyandotte County (/ˈwaɪ.əndɒt/; county code WY) is a county located in the U.S. state of Kansas. As of the 2010 census, the population was 157,505, making it the fourth-most populous county in Kansas. Its county seat and most populous city is Kansas City, with which it shares a unified government. Wyandotte County lies immediately north of Johnson County, Kansas and west of Kansas City, Missouri.
According to the U.S. Census Bureau, the county has a total area of 156 square miles (400 km), of which 152 square miles (390 km) is land and 4.6 square miles (12 km) (2.9%) is water. It is the smallest county by area in Kansas.
Wyandotte County is included in the Kansas City, MO-KS Metropolitan Statistical Area.
Wyandotte County’s population was estimated to be 163,369 in the year 2015, a increase of 5,864, or +3.0%, over the previous five years; it is the fourth largest county (in population) in the state of Kansas.
As of the 2000 census, there were 157,882 people, 59,700 households, and 39,163 families residing in the county. The population density was 1,043 people per square mile (403/km²). There were 65,892 housing units at an average density of 435 per square mile (168/km²). The racial makeup of the county was 58.18% White, 28.33% Black or African American, 1.63% Asian, 0.74% Native American, 0.04% Pacific Islander, 8.17% from other races, and 2.91% from two or more races. Hispanic or Latino of any race were 16.00% of the population.
By 2007, 48.1% of Wyandotte County’s population was non-Hispanic whites. 26.3% of the population was African-American. Native Americans made up 0.6% of the population. Asians were 1.8% of the population. Latinos made up 21.7% of the county’s population.
There were 59,700 households out of which 32.60% had children under the age of 18 living with them, 42.10% were married couples living together, 17.80% had a female householder with no husband present, and 34.40% were non-families. 28.90% of all households were made up of individuals and 10.00% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.24.
In the county, the population was spread out with 28.50% under the age of 18, 10.40% from 18 to 24, 29.50% from 25 to 44, 19.90% from 45 to 64, and 11.70% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 95.40 males. For every 100 females age 18 and over, there were 91.30 males.
The median income for a household in the county was $33,784, and the median income for a family was $40,333. Males had a median income of $31,335 versus $24,640 for females. The per capita income for the county was $16,005. About 12.50% of families and 16.50% of the population were below the poverty line, including 23.00% of those under age 18 and 11.10% of those age 65 or over.
Approximately 1.4 percent of the county’s residents use public transportation to get to work. This is the highest percentage in the state.