Franklinton is a town in, and the parish seat of Washington Parish, Louisiana, United States. The population was 3,857 at the 2010 census. The elevation is an average of 155 feet above sea level. Franklinton is located 61 miles north of New Orleans. A Franklinton physician, Jerry Thomas, represented Washington Parish in the Louisiana House of Representatives from 1988 to 1999. He was elected to the District 12 seat in the state senate, serving from 1999 to 2004.