Try ultimate campground guide this is a program that shows city, state, federal , military and county campgrounds on a map. Click on the park to see costs and what features it offers. The program has a cost of about $6.00 but I have been using it for free on both my laptop and tablet. The county park feature is nice because they run less most of the time and some of them are gems. Ultimate Campground Guide.
"Not all those who wander are lost."
(J.R.R. Tolkein from Lord of the Rings..."Strider's Poem")