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County in Minnesota, United States

Renville County is a county in the U. S. state of Minnesota. As of the 2020 census the population was 14,723. Its county seat is Olivia.

The Minnesota Territory legislature created the county on February 20, 1855. It was named for Joseph Renville, a fur trapper, trader, British officer in the War of 1812, and interlocutor with local Native American groups. Organization of the county's governing structure was completed on November 8, 1866, with Beaver Falls as county seat. Beginning in 1885, citizens in and around Olivia began pressing for the seat to be moved to Olivia, which happened in 1900.

Renville County, located directly across the Minnesota River from the Lower Sioux Agency, was the site of extensive combat during the Dakota War of 1862. The U. S. army's defeats at the Battle of Redwood Ferry and the Battle of Birch Coulee at the hands of the Dakota both occurred in Birch Cooley Township, in addition to numerous Dakota raids on white homesteads in the county. The burned out Joseph Brown House Ruins still stand, and various monuments throughout the County memorialize settlers killed in the conflict.

The Minnesota River flows southeast along the county's southwestern border. Hawk Creek flows south through the county's western end, discharging into the Minnesota. Beaver Creek drains the central part of the county, flowing southeast before turning southwest to discharge into the Minnesota. The county terrain consists of rolling hills etched by drainages and sprinkled with lakes and ponds. The area is devoted to agriculture. The county terrain slopes to the south, with its highest point near the midpoint of the northern border, at 1,122 feet (342 m) ASL. The county has a total area of 987 square miles (2,556 km2), of which 983 square miles (2,546 km2) is land and 4.2 square miles (11 km2) (0.4%) is water.

As of the census of 2000, there were 17,154 people, 6,779 households, and 4,623 families in the county. The population density was There were 7,413 housing units at an average density of The racial makeup of the county was 95.72% White, 0.06% Black or African American, 0.51% Native American, 0.20% Asian, 0.02% Pacific Islander, 2.77% from other races, and 0.73% from two or more races. 5.11% of the population were Hispanic or Latino of any race. 50.9% were of German, 16.3% Norwegian and 5.1% Swedish ancestry. There were 6,779 households, out of which 31.50% had children under the age of 18 living with them, 59.10% were married couples living together, 5.60% had a female householder with no husband present, and 31.80% were non families. 28.50% of all households were made up of individuals, and 15.10% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 3.05. The county population contained 26.50% under the age of 18, 6.60% from 18 to 24, 25.30% from 25 to 44, 21.70% from 45 to 64, and 19.80% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 99.30 males. For every 100 females age 18 and over, there were 98.50 males. The median income for a household in the county was $37,652, and the median income for a family was $45,065. Males had a median income of $30,473 versus $22,179 for females. The per capita income for the county was $17,770. About 6.30% of families and 8.80% of the population were below the poverty line, including 10.80% of those under age 18 and 8.10% of those age 65 or over.