If you have an ipad, the allstays app is well worth the $10.
Entering in Voyageurs NP, I got the following:
Arnold's Campground in International Falls Water, sewer, and Electric hookups.
Pine Aire CG overlooking Kabetogema Lake Water and Elec. hookups.
Red Pine Lodge and Resort near Kabetogema Lake
Ash River CG MN DNR (primitive, no hookups, etc)
Water's Edge CG near Crane Lake (no info)
Lake Jeanette CG US Forest Service - a bit farther away, but a very nice CG on Lake Jeanette. Water and vault toilet available, but no hookups.
And a Wallyworld just across the border from I-Falls where it appears overnight stays are allowed.