Oldham county is in the Outer Bluegrass region of Kentucky. The elevation in the county ranges from 420 to 920 feet above sea level.

It was formed in 1824 from Henry, Jefferson, and Shelby counties. Oldham county was a source of Trimble (1837) county. The county seat is La Grange.

In 2020 the county population was 67,607 in a land area of 187.22 square miles, an average of 361.1 people per square mile.

The equine population was 4,700 in the 2012 Kentucky Equine Survey.

Oldham county is in the Louisville/Jefferson County metro statistical area and the KIPDA Area Development District.

Oldham county was named for William Oldham, who served in the American Revolution and was an early settler in Kentucky.

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© 2025 David C. Elbon