Zip Code 27596 Description. Zip Code 27596 is located in the state of North Carolina in the Raleigh - Durham - Fayetteville metro area. Zip code 27596 is primarily located in Franklin County. Portions of 27596 are also located in Wake County. The official US Postal Service name for 27596 is YOUNGSVILLE, North Carolina. Portions of zip code 27596 are contained within or border the city limits of Youngsville, NC, .