Houses For Sale College Park Duplexes subdivision Ladson SC. MLS real estate listings for sale in College Park Duplexes Ladson SC by price, street, age, list date, bedrooms & more College Park Duplexes Ladson SC. Currently, College Park Duplexes in Ladson SC has a total of two listings on the local MLS for sale with an average price point of $230,000, the max being