Clark County was formed on 3 February 1801, with territory annexed from Knox county and was the first county formed in the Territory in 1790. This original area in Clark County was subsequently altered and reduced with the formation of other counties in time. The county was named after former General George Rogers Clark who was victorious in capturing various forts from the British. Jeffersonville (the county seat) has a total area of 376.5 square miles and also has a population count of 118,302 residents.