St. Joseph County is a county located in the U.S. state of Michigan, on the central southern border. As of the 2010 United States Census, the population was 61,295. The county seat is Centreville.
According to the U.S. Census Bureau, the county has a total area of 521 square miles (1,350 km), of which 501 square miles (1,300 km) is land and 20 square miles (52 km) (3.9%) is water. It is the fourth-smallest county in Michigan by total area. The entire county lies in the Saint Joseph River watershed.
The 2010 census indicates St. Joseph County had a 2010 population of 61,295. This decrease of -1,127 people from the 2000 United States Census represents a -1.8% population change (decrease) in that decade. In 2010 there were 23,244 households and 16,275 families in the county. The population density was 122.4 per square mile (47.3 square kilometers). There were 27,778 housing units at an average density of 55.5 per square mile (21.4 per km²). The racial and ethnic makeup of the county was 88.0% White, 2.5% Black or African American, 0.4% Native American, 0.7% Asian, 6.6% Hispanic or Latino, 0.1% from other races, and 1.8% from two or more races.
There were 23,244 households out of which 33.0% had children under the age of 18 living with them, 52.6% were husband and wife families, 11.7% had a female householder with no husband present, 30.0% were non-families, and 24.8% were made up of individuals. The average household size was 2.60 and the average family size was 3.08.
The county population contained 25.9% under age of 18, 8.1% from 18 to 24, 23.8% from 25 to 44, 27.4% from 45 to 64, and 14.9% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 97.9 males. For every 100 females age 18 and over, there were 95.9 males.
The 2010 American Community Survey 3-year estimate indicates the median income for a household in the county was $43,964 and the median income for a family was $52,600. Males had a median income of $30,517 versus $16,388 for females. The per capita income for the county was $19,737. About 1.8% of families and 16.3% of the population were below the poverty line, including 22.3% of those under the age 18 and 12.3% of those age 65 or over.
St Joseph County Michigan neighborhoods include: Bacon School Road, Bluffwood, Camelot, Downtown, Eagle Pointe, Edgewater Dunes, Fairways at Harbor Shores, Fox Crossing, Glen Haven/Green Acre, Island Pointe, Manor/Tanbark/Hillview, Marina, Marquette Woods, Pinebrook, Plum Creek Ln, Ridgeway, Royalton Heights, Royalton Township, Saint Joseph Scottsdale, Shoreham, South State Street, St. Joseph, The Valley Views, Trebor, Yellow Creek