Cumming is a city in Warren County, Iowa, United States. The population was 351 at the 2010 census. It is the hometown of Senator Tom Harkin.A part of the Des Moines–West Des Moines Metropolitan Statistical Area, Cumming is considered one of the smallest incorporated suburbs of the metro area. The smallest of all cities in the five-county metro area is Bevington, in Madison and Warren counties, which had a population of 58 in 2000.