Logan is a city and county seat of Harrison County, Iowa, United States, along the Boyer River. The population was 1,534 at the 2010 census.
Logan was platted in 1867 when Chicago and North Western Railway was extended to that point. It was named for John A. Logan, a Union Army general.
Logan's longitude and latitude coordinates in decimal form are 41.644614, -95.789931. According to the United States Census Bureau, the city has a total area of 1.00 square mile (2.59 km2), all of it land.
As of the census of 2010, there were 1,534 people, 595 households, and 397 families living in the city. The population density was 1,534.0 inhabitants per square mile (592.3/km2). There were 649 housing units at an average density of 649.0 per square mile (250.6/km2). The racial makeup of the city was 98.6% White, 0.1% African American, 0.1% Native American, 0.4% Asian, and 0.8% from two or more races. Hispanic or Latino of any race were 0.8% of the population.
There were 595 households, of which 35.0% had children under the age of 18 living with them, 54.1% were married couples living together, 9.1% had a female householder with no husband present, 3.5% had a male householder with no wife present, and 33.3% were non-families.