Genesee County is a county in the U.S. state of Michigan. As of the 2010 census, the population was 425,790, making it the fifth-most populous county in Michigan. The county seat and population center is Flint (birthplace of General Motors). Genesee County is considered to be a part of the greater Mid Michigan area.
According to the U.S. Census Bureau, the county has a total area of 650 square miles (1,700 km), of which 637 square miles (1,650 km) is land and 13 square miles (34 km) (1.9%) is water.
Most of the land in the county is very flat, but the southern end is hilly and covered by several lakes.
The county is mostly drained by the Flint River, which is dammed into Mott Lake and the Holloway Reservoir in the northeast corner of the county. The southeast corner and southern end are drained by the Shiawassee River.
The 2010 United States Census indicates Genesee County had a 2010 population of 425,790. This is a decrease of -10,351 people from the 2000 United States Census. Overall, the county had a -2.4% growth rate during this ten-year period. In 2010 there were 169,202 households and 111,620 families in the county. The population density was 668.5 per square mile (258.1 square kilometers). There were 192,180 housing units at an average density of 301.7 per square mile (116.5 square kilometers). 74.5% of the population were White, 20.7% Black or African American, 0.9% Asian, 0.5% Native American, 0.7% of some other race and 2.6% of two or more races. 3.0% were Hispanic or Latino (of any race). 18.0% were of German, 11.0% Irish, 10.6% English, 5.5% Polish 5.4% American and 4.8% French ancestry.
There were 169,202 households out of which 32.6% had children under the age of 18 living with them, 43.3% were husband and wife families, 17.2% had a female householder with no husband present, 34.0% were non-families, and 28.4% were made up of individuals. The average household size was 2.48 and the average family size was 3.03.
In the county, the population was spread out with 25.0% under age of 18, 8.9% from 18 to 24, 24.7% from 25 to 44, 27.6% from 45 to 64, and 13.7% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 93.1 males. For every 100 females age 18 and over, there were 89.4 males.
The 2010 American Community Survey 1-year estimate indicates the median income for a household in the county was $38,819 and the median income for a family was $48,979. Males had a median income of $27,269 versus $18,082 for females. The per capita income for the county was $19,860. About 16.9% of families and 21.0% of the population were below the poverty line, including 31.0% of those under the age 18 and 6.3% of those age 65 or over.