Passage: Afton is a city in Union County, in southwestern Iowa, United States. The population was 845 at the 2010 census. Its peak of population was in 1880, at 1,231 residents, when numerous European immigrants and migrants from the eastern United States settled here for the farmland. Mechanization of farming and consolidation of farms has reduced the population.

Question: The 2010 census recorded a population of 845 in what city in Union County, Iowa?
Afton