Near the mouth of the Naselles River, on the south bank, was the small development of Chetlo Harbor. It was close to or perhaps the 'port' of a ferry service operating in the early part of the 20th century. Shortly after the closure of this post office, postal service was opened at Mill Ranch, the north bank home of the ferry."Jetlo" is an Indian word for Oyster. Oystering and a processing plant still operate in the same area.