Le Roy, or more commonly LeRoy, is a town in Genesee County, New York, United States. The population was 7,662 at the time of the 2020 census. The town is named after one of the original land owners, Herman Le Roy. The town lies on the southwestern edge of Monroe County. Within the town is a village of Le Roy. The Jell-O gelatin dessert was invent…Le Roy, or more commonly LeRoy, is a town in Genesee County, New York, United States. The population was 7,662 at the time of the 2020 census. The town is named after one of the original land owners, Herman Le Roy. The town lies on the southwestern edge of Monroe County. Within the town is a village of Le Roy. The Jell-O gelatin dessert was invented and first manufactured in Le Roy.