Wellington is a home rule-class city in metro Louisville, Jefferson County, Kentucky, United States. It is considered to be part of the Upper Highlands section of Louisville. It was incorporated in 1946. The population was 565 at the 2010 census.

Jefferson County is located in the north central portion of the U.S. state of Kentucky. As of the 2020 census, the population was 782,969. It is the most populous county in the commonwealth.