Why is Del Haven this secret little place?

Del Haven / Philadelphia - Why is Del Haven this secret little place? There are no signs showing you how to get there. Nowhere will you find a sign pointing to Del Haven. If you look in the yellow pages under the U.S. Postal Zip Codes for Jersey, it isn't listed. It is not the Villas, even though it is the same zip code, as it is in a totally different township. What gives?