Adjacent counties

• Holmes County (north)
• Tuscarawas County (east)
• Guernsey County (southeast)
• Muskingum County (south)
• Licking County (southwest)
• Knox County (west)

2000 census

As of the census^[11] of 2000, there were 36,655 people, 14,356 households, and 10,164 families living in the county. The population density was 65 inhabitants per square mile (25/km²). There were 16,107 housing units at an average density of 29 units per square mile (11/km²). The racial makeup of the county was 97.35% White, 1.09% Black or African American, 0.17% Native American, 0.32% Asian, 0.03% Pacific Islander, 0.20% from other races, and 0.84% from two or more races. 0.59% of the population were Hispanic or Latino of any race. 29.4% were of German, 23.4% American, 11.6% English and 9.3% Irish ancestry according to Census 2000. 93.9% spoke English, 2.4% German, 1.5% Pennsylvania Dutch, and 0.9% Dutch as their first language.^[12]

There were 14,356 households, out of which 32.60% had children under the age of 18 living with them, 57.80% were married couples living together, 9.20% had a female householder with no husband present, and 29.20% were non-families. 25.40% of all households were made up of individuals, and 11.90% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.01.

In the county, the population was spread out, with 26.20% under the age of 18, 7.80% from 18 to 24, 27.40% from 25 to 44, 24.00% from 45 to 64, and 14.70% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 95.50 males. For every 100 females age 18 and over, there were 92.70 males.

The median income for a household in the county was $34,701, and the median income for a family was $41,676. Males had a median income of $31,095 versus $21,276 for females. The per capita income for the county was $16,364. About 7.00% of families and 9.10% of the population were below the poverty line, including 10.40% of those under age 18 and 9.10% of those age 65 or over.

2010 census

As of the 2010 United States Census, there were 36,901 people, 14,658 households, and 10,089 families living in the county.^[13] The population density was 65.4 inhabitants per square mile (25.3/km²). There were 16,545 housing units at an average density of 29.3 units per square mile (11.3 units/km²).^[14] The racial makeup of the county was 97.0% white, 1.1% black or African American, 0.3% Asian, 0.2% American Indian, 0.2% from other races, and 1.2% from two or more races. Those of Hispanic or Latino origin made up 0.8% of the population.^[13] In terms of ancestry, 29.5% were German, 14.2% were Irish, 11.2% were English, and 10.3% were American.^[15]

Of the 14,658 households, 30.8% had children under the age of 18 living with them, 53.7% were married couples living together, 10.4% had a female householder with no husband present, 31.2% were non-families, and 26.3% of all households were made up of individuals. The average household size was 2.49 and the average family size was 2.98. The median age was 40.8 years.^[13]

The median income for a household in the county was $39,469 and the median income for a family was $47,931. Males had a median income of $39,701 versus $26,706 for females. The per capita income for the county was $19,635. About 12.4% of families and 17.0% of the population were below the poverty line, including 26.0% of those under age 18 and 8.3% of those age 65 or over.^[16]

Amish and Mennonite congregations

In 2020, the Amish and Mennonite population of the county was 2,724 or 7.4% of the total population.^[17]

City

• Coshocton (county seat)

Villages

• Conesville
• Nellie
• Plainfield
• Warsaw
• West Lafayette

Townships

Census-designated places

• Canal Lewisville
• Fresno

Unincorporated communities