Indiana.
Here, 1 of the federal campgrounds, 6%, still take walk-ups of the 16 whose booking the agencies publish. The other 7 publish nothing either way.
See Indiana on the mapFirst-come Reservable · every dot is a campground in its place
23 campgrounds
Dunewood CampgroundReservableOpenfrom $2513 hike-in sites4 pull-through sites66 sites620 ft534 ft to streamdrinking watertoilets
Dunbar Group SiteReservableOpenfrom $1001 hike-in site1 siterigs to 20 ft670 ft519 ft to streamtoilets
Hardin RidgeReservablefrom $2436 walk-in sites190 with a tent pad201 sitesrigs to 60 ft790 fthookupstoiletsshowers
Indian Celina LakeReservablefrom $2461 with a tent pad63 sitesrigs to 35 ft750 ft439 ft to streamhookupsdrinking watertoilets
Tipsaw LakeReservablefrom $244 walk-in sites35 with a tent pad48 sitesrigs to 102 ft520 ft430 ft to Tipsaw Lakehookupsdrinking watertoilets
Blackwell CampgroundReservableFree28 sites790 fttoilets
German Ridge CampgroundReservablefrom $82 pull-through sites20 sites680 fttoilets
Shirley Creek CampgroundReservableFree17 sites740 fttoilets
Youngs Creek CampgroundReservableFree14 sites840 ft501 ft to pondtoilets
Saddle Lake CampgroundReservablefrom $52 hike-in sites13 sites630 fttoilets
Hickory Ridge CampgroundReservableFree10 sites870 fttoilets
Buzzard Roost CampgroundReservableFree5 sites620 ft652 ft to Ohio Rivertoilets
Central Avenue Walk-in SitesReservablefrom $255 hike-in sites5 sites620 fttoilets
Chellberg Farm Picnic SheltersReservableSites from $25640 ft390 ft to East Arm Little Calumet Rivertoilets
West Beach Picnic SheltersReservableSites from $25590 ft44 ft to streamdrinking watertoiletsshowersCatbrier LoopOpen600 ftNorth Face LoopOpenfrom $10740 fttoiletsDogwood LoopSeasonal600 fttoiletsshowersGoldenrod LoopSeasonal600 fttoiletsshowersJackpine LoopSeasonal580 fttoiletsshowersPrimrose LoopSeasonal600 fttoiletsshowersQuakertown CampgroundFirst-come990 ftSouth Slope Loop710 fttoiletsshowersUnits in Indiana
2 with campgroundsSource: USGS Protected Areas Database of the United States (PAD-US) land units
Source: campground records from RIDB, NPS, USFS EDW and BLM, unified by CAMPANAC, refreshed nightly