Harrington is a city in Kent County, Delaware, United States. It is part of the Dover, Delaware Metropolitan Statistical Area. Harrington hosts the annual Delaware State Fair each July. The population was 3,562 at the 2010 census.
Harrington is located at 38°55′28″N 75°34′29″W / 38.92444°N 75.57472°W / 38.92444; -75.57472 (38.924446, -75.574720).
According to the United States Census Bureau, the city has a total area of 2.0 square miles (5.3 km²), of which, 2.0 square miles (5.2 km²) of it is land and 0.04 square miles (0.1 km²) of it (1.48%) is water.