Originally Posted by TexAirS
Try Boysen SP on the Wind River or Buffalo Bill SP.
Both are great. And on the eastern half of the state?
I agree with John about these being wonderful campgrounds. Boysen State Park is more toward the center of the state. After we left Yellowstone and the Tetons on our trip out west in 2015 we planned to spend some time in Thermopolis. We wanted to explore the Hot Springs State Park there. We camped at a private campground in Thermopolis, but after leaving there and continuing on our journey we drove down the Wind River Valley toward Shoshoni, WY. What a spectacular drive. https://travelwyoming.com/listing/sh...n-scenic-byway
We saw the campgrounds of Boysen State Park (BSP) there, right on the river as we drove through. They were beautiful and we wished we had stayed there. Thermopolis is an easy drive from BSP campgrounds and the mineral Hot Spring is worth seeing. However, camping is prettier and better in the Wind River Canyon, Boysen State Park.
We stayed on some friends property near Yellowstone in Powell, Wyoming. On our day trips into the east entrance of Yellowstone we passed by Buffalo Bill State Park although a more western location than BSP. It is beautiful too! Some sites overlook the Shoshone River. The Buffalo Bill Cody Dam is there closer into Cody, WY. and a must see.
If you just need a place to overnight, there is a city park in Powell, Wy. which is not too far from, Yellowstone and Thermopolis and very close to Cody, Wy. It is Homesteader City Park - 1049 E Coulter Ave Powell, WY 82435.
They allow 48 hour stay parking. It is first come first serve. There is a little museum with nice restroom facilities, picnic tables and grilling areas, and a dump station with potable water for refilling fresh water tanks. It is free.