Zip Code 29456 is located in the state of South Carolina in the Charleston metro area. Zip code 29456 is primarily located in Charleston County. Portions of 29456 are also located in Berkeley County. The official US Postal Service name for 29456 is LADSON, South Carolina. Portions of zip code 29456 are contained within or border the city limits of Ladson, SC, North Charleston, SC, Summerville, SC, and Goose Creek, SC. The area code for zip code 29456 is 843.