Kansas.
Here, 1 of the federal campgrounds, 2%, still take walk-ups of the 58 whose booking the agencies publish. The other 1 publish nothing either way.
See Kansas on the mapFirst-come Reservable · every dot is a campground in its place
59 campgrounds
In 2 places, folded
Cimarron National Grassland2 campgrounds · 1 open›
Outside a named unit57 campgrounds›
Bloomington EastReservablefrom $1476 pull-through sites2 group sites323 sitesrigs to 100 ft910 fthookupsdrinking watertoilets
Cottonwood PointReservablefrom $1011 pull-through sites2 group sites169 sitesrigs to 70 ft1,370 ft360 ft to lakehookups
Curtis CreekReservablefrom $1471 sitesrigs to 80 ft1,200 fthookupstoiletsshowers
Lucas ParkReservablefrom $1228 pull-through sites1 group site96 sitesrigs to 148 ft1,730 fthookups
Michigan ValleyReservablefrom $1412 pull-through sites1 group site78 sitesrigs to 114 ft1,070 fthookupstoiletsshowers
Minooka ParkReservablefrom $817 pull-through sites1 group site146 sitesrigs to 107 ft1,560 fthookups
Mound ValleyReservablefrom $1411 pull-through sites2 group sites85 sitesrigs to 90 ft870 ft131 ft to Big Hill Lakehookupstoiletsshowers
Outlet(Melvern)Reservablefrom $2689 pull-through sites150 sitesrigs to 80 ft980 ft438 ft to Marais des Cygnes Riverhookupsdrinking watertoiletsshowers
Rock Creek (KS)Reservablefrom $1610 walk-in sites4 pull-through sites80 sitesrigs to 100 ft920 fthookupsdrinking water
Slough CreekReservablefrom $1610 pull-through sites3 group sites177 sitesrigs to 72 ft1,020 fthookups
Venango ParkReservablefrom $184 pull-through sites1 group site126 sitesrigs to 65 ft1,500 ft546 ft to Kanopolis Lakehookupsdrinking watertoiletsshowers
West Rolling HillsReservablefrom $143 pull-through sites65 sitesrigs to 165 ft1,200 fthookupstoiletsUnits in Kansas
1 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