Shawnee people used the area for hunting purposes before white settlers arrived in the early 19th century.

Morrow County is included in the Columbus, OH Metropolitan Statistical Area.

In 2010, the center of population of Ohio was located in Morrow County, near the village of Marengo.

[4] Morrow County's historic World War I Victory Shaft, unique in the United States, is located in the center of downtown Mount Gilead.

Other areas interesting to the tourist include: Mount Gilead State Park; Amish farms and businesses near Johnsville and Chesterville; the Mid-Ohio Sports Car Course near Steam Corners; the rolling Allegheny foothills of eastern Morrow County; the site of the birthplace of President Warren G. Harding near Blooming Grove; the site of the former Ohio Central College in Iberia; the early 19th-century architecture of buildings in Chesterville, Ohio; the Revolutionary War Soldiers' Memorial in Mount Gilead; the Civil War monument in Cardington; and the mid-19th-century architecture of the Morrow County Courthouse and Old Jail in Mount Gilead.

Ossing Run is a tributary of Shaw Creek that flows through Morrow County, Ohio.

The United States Geological Survey’s Geographic Names Information System (GNIS) classifies Ossing Run as a stream with an identification number of 2761345.

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.

As of the 2010 United States Census, there were 34,827 people, 12,855 households, and 9,578 families living in the county.