Magnetic Springs is a village in Leesburg Township, Union County, Ohio, United States. The population was 267 at the 2020 census. The village has a post office with the ZIP Code of 43036. Magnetic Springs was platted in 1879 when underground springs were discovered there. The community earned its name from the mineral waters used for healing …Magnetic Springs is a village in Leesburg Township, Union County, Ohio, United States. The population was 267 at the 2020 census. The village has a post office with the ZIP Code of 43036. Magnetic Springs was platted in 1879 when underground springs were discovered there. The community earned its name from the mineral waters used for healing processes. Word spread across the country of these springs, and tourists began visiting from locations nationwide; even foreigners appeared occasionally. Hotel resorts sprang up, and the village boomed. Following the discovery of modern medicinal cures, including the vaccine for polio, the interest in natural healing remedies faded, and the city's tourism industry collapsed. By the early 1980s, the hotel resorts had been torn down.