Chaplin is an unincorporated community and census-designated place in Nelson County, Kentucky, United States. Its population was 418 as of the 2010 census. Chaplin has a post office with ZIP code 40012, which opened on January 4, 1832. U.S. Route 62 passes through the community.According to the U.S. Census Bureau, the community has an area of 1.400 square miles; 1.383 square miles of its area is land, and 0.017 square miles is water.