Harper is a city in Harper County, Kansas, United States. As of the 2010 census, the city population was 1,473.
Harper is located at 37°17′07″N 98°01′36″W / 37.285252°N 98.026615°W / 37.285252; -98.026615 (37.285252, -98.026615). According to the United States Census Bureau, the city has a total area of 1.3 square miles (3.3 km2), all of it land.
As of the census of 2000, there were 1,567 people, 675 households, and 417 families residing in the city. The population density was 1,219.0 people per square mile (469.0/km2). There were 787 housing units at an average density of 612.2 per square mile (235.6/km2). The racial makeup of the city was 97.57% White, 0.13% African American, 0.64% Native American, 0.57% from other races, and 1.08% from two or more races. Hispanic or Latino of any race were 1.21% of the population.