Hartley is a city in O'Brien County, Iowa, United States. The population was 1,672 in the 2010 census, a decline from 1,733 in the 2000 census.
Hartley's longitude and latitude coordinates
in decimal form are 43.181847, -95.476328.
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.