According to the U.S. Census Bureau, the county has a total area of, of which is land and is water. Morrow County is considered to be a part of "Mid Ohio."
Ossing Run is a tributary of Shaw Creek that flows through Morrow County, Ohio. Shaw Creek flows into Whetstone Creek which is located adjacent to Cardington, Ohio. The United States Geological Survey’s Geographic Names Information System classifies Ossing Run as a stream with an identification number of 2761345. The feature name was entered into the GNIS system in April 2014.
As of the census of 2000, there were 31,628 people, 11,499 households, and 8,854 families living in the county. The population density was 78 people per square mile. There were 12,132 housing units at an average density of 30 per square mile. The racial makeup of the county was 98.37% White, 0.27% Black or African American, 0.30% Native American, 0.15% Asian, 0.18% from other races, and 0.74% from two or more races. 0.58% of the population were Hispanic or Latino of any race. There were 11,499 households out of which 35.60% had children under the age of 18 living with them, 64.60% were married couples living together, 8.10% had a female householder with no husband present, and 23.00% were non-families. 19.00% of all households were made up of individuals and 7.90% had someone living alone who was 65 years of age or older. The average household size was 2.72 and the average family size was 3.09. In the county, the population was spread out with 27.30% under the age of 18, 7.60% from 18 to 24, 29.30% from 25 to 44, 24.30% from 45 to 64, and 11.50% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 99.40 males. For every 100 females age 18 and over, there were 98.00 males. The median income for a household in the county was $40,882, and the median income for a family was $45,747. Males had a median income of $33,129 versus $22,454 for females. The per capita income for the county was $17,830. About 6.60% of families and 9.00% of the population were below the poverty line, including 12.40% of those under age 18 and 7.10% of those age 65 or over.
2010 census
As of the 2010 United States Census, there were 34,827 people, 12,855 households, and 9,578 families living in the county. The population density was. There were 14,155 housing units at an average density of. The racial makeup of the county was 97.7% white, 0.3% black or African American, 0.3% Asian, 0.1% American Indian, 0.2% from other races, and 1.3% from two or more races. Those of Hispanic or Latino origin made up 1.1% of the population. In terms of ancestry, 30.8% were German, 16.1% were American, 14.4% were Irish, and 13.3% were English. Of the 12,855 households, 35.1% had children under the age of 18 living with them, 59.5% were married couples living together, 9.5% had a female householder with no husband present, 25.5% were non-families, and 20.7% of all households were made up of individuals. The average household size was 2.68 and the average family size was 3.08. The median age was 39.5 years. The median income for a household in the county was $49,891 and the median income for a family was $55,980. Males had a median income of $41,096 versus $32,911 for females. The per capita income for the county was $20,795. About 7.5% of families and 10.8% of the population were below the poverty line, including 13.9% of those under age 18 and 9.5% of those age 65 or over.
Politics
Morrow County is a Republican stronghold county. The last time it voted for a Democratic candidate was Lyndon B. Johnson in 1964.
