Bullitt County was formed in 1797. The elevation in the county ranges from 385 to 998 feet above sea level. The land area is 299.08 square miles. The county seat is Shepherdsville.
Jefferson County was formed in 1780. The elevation in the county ranges from 383 to 902 feet above sea level. The land area is 385.09 square miles. The county seat is Louisville. Jefferson County was one of the original counties in the Kentucky territory of Virginia. It is the most populous county and the most densely populated county in the state.
Oldham County was formed in 1824. The elevation in the county ranges from 420 to 920 feet above sea level. The land area is 89.19 square miles. The county seat is La Grange.
Shelby County was formed in 1792. The elevation in the county ranges from 550 to 1188 feet above sea level. The land area is 384.19 square miles. The county seat is Shelbyville.
