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Dunlap is an unincorporated census-designated place (CDP) in Colerain Township, Hamilton County, about 15 miles north of downtown Cincinnati.

Dunlap's ground saw the Siege of Dunlap's Station, a battle fought near the Great Miami River in 1791 during the Northwest Indian War.

The community was first laid out around 1849-1850 and was originally named Georgetown in honor of early settler George Struble, who built some of its first houses and kept its first hotel.

The village took the name Dunlap after the Dunlap post office, previously operated out of a cotton factory elsewhere in Colerain Township, was moved into the village.

By 1894 Dunlap had grown to include two churches, a schoolhouse, and several stores and industries, with a blacksmith shop as its first business.

The 2020 census counted 1,658 people in Dunlap living in 559 households, with a notably high median age of 55.8 years.

According to Census Bureau survey estimates for 2016-2020, Dunlap's median household income was about $95,125 and roughly 39% of residents held a bachelor's degree or higher.

Dunlap spreads across about 6.7 square miles of northwestern Hamilton County, with U.S. Route 27 and Colerain Avenue as its main roads and ZIP code 45251.