where is delaware county
Welcome to Delaware County, PA! Your one-stop source for everything local in Delaware County  from photos to county history to the latest in Delaware County real estate, local businesses, entertainment, museums, shopping, guides, & much, much more... Named for the Delaware River, Delaware County is one of 67 counties in Pennsylvania. Delco, a fast-growing county located just southwest of the city of Philadelphia, has 49 unique municipalities with a total population of 558,979 (2010 census).