Oldham county is in the Outer Bluegrass region of Kentucky. The elevation in the county ranges from 420 to 920 feet above sea level.
In 2010 the county population was 60,316 in a land area of 187.22 square miles, an average of 322.2 people per square mile.
The equine population was 4,700 in the 2012 Kentucky Equine Survey.
Oldham county was named for William Oldham, who served in the American Revolution and was an early settler in Kentucky.