Information and reservations for campgrounds located in the White Mountain National Forest provided by the United States Forest Service.
http://www.fs.fed.us/r9/forests/white_mountain/recreation/camping/
The NH Division of Parks and Recreation operates 43 state parks, 12 historic sites, 7 recreational trails, 39 islands, 4 state fishing piers and marinas, 14 natural areas and numerous wayside and miscellaneous areas.
http://www.nhparks.state.nh.us
The site operated by the NH Campground Owners Association, divides the state into seven regions and lists most of the private campgrounds in each region.