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County in the United States

Guernsey County is a county located in the U. S. state of Ohio. As of the 2020 census, the population was 38,438. Its county seat and largest city is Cambridge. It is named for the Isle of Guernsey in the English Channel, from which many of the county's early settlers emigrated. Guernsey County comprises the Cambridge, OH Micropolitan Statistical Area, which is also included in the Columbus Marion Zanesville, OH Combined Statistical Area.

Guernsey County, located in the Appalachian foothills, was first formed and organized on March 10, 1810, from portions of Muskingum and Belmont counties, after the Ohio Legislature acted. The first county commissioners were sworn in on April 23, 1810. It lost some land area during the formation of neighboring counties until it reached its present boundaries in 1851, after Buffalo, Beaver, Olive, and Seneca townships were gained by Noble county. After dispute whether the county seat should be established in Cambridge or Washington, it was established in Cambridge after two individuals proposed to donate the land and furnish the public buildings if built in Cambridge.

According to the U. S. Census Bureau, the county has a total area of 528 square miles (1,368 km2), of which 522 square miles (1,352 km2) is land and 6.0 square miles (16 km2) (1.1%) is water.

As of the census of 2000, there were 40,792 people, 16,094 households, and 11,233 families living in the county. The population density was There were 18,771 housing units at an average density of The racial makeup of the county was 96.28% White, 1.53% Black or African American, 0.31% Native American, 0.30% Asian, 0.22% from other races, and 1.36% from two or more races. 0.62% of the population were Hispanic or Latino of any race. 96.7% spoke English, 1.3% Spanish and 1.1% German as their first language. There were 16,094 households, out of which 32.40% had children under the age of 18 living with them, 53.90% were married couples living together, 11.40% had a female householder with no husband present, and 30.20% were non families. 26.10% of all households were made up of individuals, and 11.20% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.00. In the county, the population was spread out, with 26.20% under the age of 18, 7.90% from 18 to 24, 27.50% from 25 to 44, 24.00% from 45 to 64, and 14.50% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 94.50 males. For every 100 females age 18 and over, there were 91.40 males. The median income for a household in the county was $30,110, and the median income for a family was $35,660. Males had a median income of $30,142 versus $20,804 for females. The per capita income for the county was $15,542. About 12.90% of families and 16.00% of the population were below the poverty line, including 21.50% of those under age 18 and 12.30% of those age 65 or over.

As of the 2010 United States Census, there were 40,087 people, 16,210 households, and 10,949 families living in the county. The population density was There were 19,193 housing units at an average density of The racial makeup of the county was 96.0% white, 1.5% black or African American, 0.3% Asian, 0.2% American Indian, 0.2% from other races, and 1.8% from two or more races. Those of Hispanic or Latino origin made up 0.9% of the population. Of the 16,210 households, 31.1% had children under the age of 18 living with them, 49.8% were married couples living together, 12.3% had a female householder with no husband present, 32.5% were non families, and 27.7% of all households were made up of individuals. The average household size was 2.44 and the average family size was 2.95. The median age was 40.9 years.