Hawaii.
Here, 2 of the federal campgrounds, one in four, still take walk-ups.
See Hawaii on the mapFirst-come Reservable · every dot is a campground in its place
8 campgrounds
Wilderness Tent SitesReservableOpen10 sites7,040 ftdrinking watertoilets
Hosmer Grove CampgroundReservableOpenfrom $206 sites6,180 ftdrinking watertoilets
Wilderness CabinsReservableOpen3 sites6,390 ftdrinking watertoilets
Kipahulu CampgroundReservablefrom $2021 sites6,180 fttoilets
NāmakanipaioMixedfrom $1516 sites3,920 ftdrinking watertoilets
Haleakalā National Park (Wilderness Tent Permit)Reservablefrom $2010 hike-in sites2 group sites10 sites7,030 fttoilets
KulanaokuaikiFirst-comefrom $109 sites3,180 fttoilets
Haleakalā National Park (Cabin Permits)ReservableSites from $753 sites6,700 fttoiletsUnits in Hawaii
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