Tiffin is a city in Johnson County, Iowa, United States. It is part of the Iowa City, Iowa Metropolitan Statistical Area. The population was 1,947 at the 2010 census. F. W. Kent County Park is located just to the west of Tiffin, and is a popular site for outdoor recreation in Johnson County, being noted for its lake, camping facilities, resident whitetail deer herd and wild turkeys, and its cross-country ski trails through rolling acres of oak and hickory forest.
Tiffin was platted in 1867. The name was a transfer from Tiffin, Ohio, the former home of Rolla Johnson, who owned the town site.
Tiffin is located at 41°42′23″N 91°39′41″W (41.706432, -91.661471).
According to the United States Census Bureau, the city has a total area of 4.14 square miles (10.72 km2), of which 4.13 square miles (10.70 km2) is land and 0.01 square miles (0.03 km2) is water.
As of the census of 2010, there were 1,947 people, 800 households, and 488 families living in the city. The population density was 471.4 inhabitants per square mile (182.0/km2). There were 848 housing units at an average density of 205.3 per square mile (79.3/km2). The racial makeup of the city was 92.0% White, 2.5% African American, 0.3% Native American, 1.6% Asian, 0.1% Pacific Islander, 0.5% from other races, and 3.0% from two or more races. Hispanic or Latino of any race were 3.6% of the population.