Shannon City is a city in southern Union and northern Ringgold counties in the U.S. state of Iowa. The population was 73 at the time of the 2020 census.

Union County is a county located in the southern part of the U.S. state of Iowa. As of the 2020 Census, the population was 12,138. The county seat is Creston. Organized at a time of tensions before the Civil War, the county was named in 1853 for the union that people wanted to preserve. Union County peaked in population at the 1900 Census. Its economy is based on agriculture and related industries.