what parish is youngsville in
Sponsored Topics. Youngsville is a city in Lafayette Parish, Louisiana, United States. The population was 5,289 as of the 2005 Census Bureau estimates. It is part of the Lafayette Metropolitan Statistical Area. Youngsville is located at 30Â°6â²2â³N 91Â°59â²27â³W / 30.10056Â°N 91.99083Â°W / 30.10056; -91.99083 (30.100595, -91.990707).