Edgewood is a city in Clayton and Delaware counties in the U.S. state of Iowa. Highway 3, which runs through the center of town, is the dividing line between the two counties. The Edgewood post office was established in 1852 on the Clayton side of the town. Edgewood was formally incorporated in 1892 even though it had a functioning council for some time before that. The population was 864 at the 2010 census, down from 923 at the 2000 census.