Lorimor is a city in Union County, Iowa, United States. The population was 360 at the 2010 census. Lorimor was founded by J.S. Lorimor, who was given the honor of renaming the city, when the town grew after he gave land to the railroads as they traveled through town, in return for the railroad placing a water stop in the town. With the business from the railroads, and his 2,000-acre (8.1 km2) farm of bluegrass seed, the town was quite successful in its early years.
Lorimor is located at 41°07′35″N 94°03′21″W (41.126514, -94.055902).
According to the United States Census Bureau, the city has a total area of 0.38 square miles (0.98 km2), all land.
As of the census of 2010, there were 360 people, 160 households, and 104 families residing in the city. The population density was 947.4 inhabitants per square mile (365.8/km2). There were 211 housing units at an average density of 555.3 per square mile (214.4/km2). The racial makeup of the city was 98.1% White, 0.3% African American, 0.8% Native American, and 0.8% from two or more races. Hispanic or Latino of any race were 0.8% of the population.
There were 160 households, of which 28.8% had children under the age of 18 living with them, 43.8% were married couples living together, 13.8% had a female householder with no husband present, 7.5% had a male householder with no wife present, and 35.0% were non-families.