DeWitt[a] is a city in Clinton County, Iowa, United States.

The population was 5,514 at the time of the 2020 census, which represented a 9.2% increase over that of 2000, making it the fastest growing city in Clinton County.

[6] Ralph Waldo Emerson gave a lyceum lecture at DeWitt in January 1866.

[8] According to the United States Census Bureau, the city has a total area of 5.98 square miles (15.49 km2), all land.

[13] DeWitt is served by the Union Pacific along the south side on tracks originally built by the Chicago and Northwestern railroad.

Until 1971, the Milwaukee Road entered DeWitt from the north and ran along 7th Avenue before crossing the tracks of the former Chicago & Northwestern into Scott County.

What had served as the Chicago & Northwestern's Depot was destroyed by fire circa 1969 and never rebuilt.

By 1980 both highways were moved to new alignments around the south and west sides of DeWitt, first suggested in a plan from the early 1960s.

In addition to DeWitt, the nearby cities of Grand Mound, Low Moor, and Welton are also a part the school district.

[15] It was previously known as the Central Clinton Community School District until July 1, 2014.

In addition to DeWitt, The Observer also serves much of rural eastern Clinton County.