Spring Mill is a home rule-class city in Jefferson County, Kentucky, United States.

Spring Mill is located in southern Jefferson County and is 12 miles (19 km) southeast of downtown Louisville.

According to the United States Census Bureau, the city has a total area of 0.054 square miles (0.14 km2), all land.

There were 130 housing units at an average density of 2,155.4 per square mile (832.2/km2).

6.2% of all households were made up of individuals, and 4.6% had someone living alone who was 65 years of age or older.