Boondocking web site

And another, mentioned by someone here recently.

There's a nice review of the Ultimate Campground app here:

The Ultimate Campground app and campground list is updated monthly, mostly from people submitting corrections.  If you have any corrections, please use the contact page:

Not my job to correct their web site.  I would go there for info that helps me, not the other way around.  Inaccurate info is worse than no info.  Plus it's more fun to just go explore and figure it out yourself. 
Most of their shown State land camping icons in the Cody to Yellowstone to Montana area of NW Wy are wrong.  Some are illegal to even camp on like on the lower Clarks fork river, some aren't even State camping areas like Swamp lake on the Shoshone forest.  That's a guest ranch  and it's a USFS lease and you can't camp in their parking lot.  There is no Upper Clarks fork river Game and Fish camping area, that is on forest land and is a pull off along the highway where people camp.  The Sunlight Game and fish areas are wrong.  It's a mess.  It is mostly the State of Wyo areas that are wrong. 

Wyoming state trust owned lands are illegal to camp on statewide. 
Wyoming Game and Fish lands do offer opportunity, but you need to find out the details first. 
BOR and BLM are open unless noted otherwise. 
Forest Service lands in NW Wy have area specific restrictions. 
NPS lands are, well, they are their own country almost.  They do whatever they want to do, and mostly around Yellowstone they don't like people.  Camp there after reading all the small print.
The NW Wy camping areas are something you can get off of any forest service, NPS, or State lands web site.   Go to the source.
Ultimate boondocking is not a compelling or worthy link to me if I have to edit it to make it correct. 
Get a Moon handbook and then you've got something, and no, I have no financial connection or other oblique interest in moon guides. 

Very well said techntrek!!