Farmersburg is a city in Clayton County, Iowa, United States. The population was 271 at the time of the 2020 census, down from 300 i…Farmersburg is a city in Clayton County, Iowa, United States. The population was 271 at the time of the 2020 census, down from 300 in 2000. The current mayor is Glenn Radloff, a cross-country truck driver.