Four Nice neighborhood lots in Interlachen Lake Estates Florida. Build now or buy for investment. Interlachen is located in Putnam County. Putnam County is a county located in the state of Florida. Putnam offers a relaxed area between the waterfront and the historic commercial district, several vintage buildings have been restored while sleek waterfront condos have been added. With a wide sidewalk, oak trees, terraced seating, benches, and a lush green lawn, a riverfront park is a popular place for picnics, fishing, a stroll, or simply stopping awhile and settling down with a book. Closing costs: Approx $500 All properties come with a warranty deed and close through title company with title insurance.