Manufacturing and health care are major components of Mercer County’s economy, together accounting for a large share of local employment. The county is home to , an online manufacturer and retailer of customized promotional products headquartered in Coldwater; founded in 1993, the firm employed about 230 people as of 2023. Other employers headquartered or operating in Mercer County include Celina Insurance Group, based in the county seat of Celina; Celina Aluminum Precision Technology (CAPT), a Honda supplier in Celina that announced a $59.1 million investment in 2024 to support battery-electric vehicle parts; Fort Recovery Industries, a zinc and aluminum die-casting manufacturer in Fort Recovery; J&M Manufacturing, a producer of grain handling equipment in Fort Recovery; Celina Tent, a maker of engineered fabric structures and event equipment in Celina with past U.S. Department of Defense contracts; VAL-CO/Val-Co Pax, which manufactures poultry and swine production equipment in Coldwater; and Basic Grain Products, a snack-foods producer operating in Coldwater. Mercer Health operates the county’s primary hospital, Mercer County Community Hospital, in Coldwater, with additional campuses and clinics across the county.
2020 census 2010 census As of the
2010 United States census, there were 40,814 people, 15,532 households, and 11,172 families living in the county. The population density was . There were 17,633 housing units at an average density of . The racial makeup of the county was 97.4% white, 0.4% Asian, 0.2% Pacific islander, 0.2% American Indian, 0.2% black or African American, 0.6% from other races, and 0.9% from two or more races. Those of Hispanic or Latino origin made up 1.5% of the population. Of the 15,532 households, 32.6% had children under the age of 18 living with them, 60.1% were married couples living together, 7.6% had a female householder with no husband present, 28.1% were non-families, and 24.5% of all households were made up of individuals. The average household size was 2.60 and the average family size was 3.11. The median age was 39.4 years.
2000 census As of the
census of 2010, there were 40,814 people, 14,756 households, and 11,022 families living in the county. The population density was . There were 15,875 housing units at an average density of . The racial makeup of the county was 98.44%
White, 0.10%
Black or
African American, 0.26%
Native American, 0.29%
Asian, 0.02%
Pacific Islander, 0.34% from
other races, and 0.56% from two or more races. 1.15% of the population were
Hispanic or
Latino of any race. There were 14,756 households, out of which 37.10% had children under the age of 18 living with them, 64.10% were
married couples living together, 7.40% had a female householder with no husband present, and 25.30% were non-families. 22.70% of all households were made up of individuals, and 10.80% had someone living alone who was 65 years of age or older. The average household size was 2.74 and the average family size was 3.24. In the county, the population was spread out, with 29.60% under the age of 18, 7.90% from 18 to 24, 26.70% from 25 to 44, 21.20% from 45 to 64, and 14.50% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 99.80 males. For every 100 females age 18 and over, there were 96.20 males. The median income for a household in the county was $42,742, and the median income for a family was $50,157. Males had a median income of $35,508 versus $22,857 for females. The
per capita income for the county was $18,531. About 4.60% of families and 6.40% of the population were below the
poverty line, including 6.90% of those under age 18 and 7.80% of those age 65 or over. ==Politics==