I found this website Free campsites to be extremely helpful as I travel. Just put in your location, whether by zip code or city-State, and it will show all the camping options. It will identify those where you can camp for free or others that require a fee. When you select one of the campsites, a brief description will pop-up. Then you can click on the description to actually drill down for information including the url for their website, fees, how many campsites, what kind of toilets, hookup options, showers, pictures and much more.