Yellowstone / Old Faithful area

Closes commercial is in West Yellowstone. We stay at Buffalo Crossing.

The NPS website says Fishing Bridge campground is closed for the 2019 season, and will be closed for the 2020 season until mid-September.

:):)

West Yellowstone. Several nice commercial campgrounds. Be ready for some long drives, Yellowstone is a big place and nothing is close to anything else. Carry your Infared thermometer.

Commercial CG? Old Faithful is a long way from any private land and hence commercial CGs. I am guessing that West Yellowstone is as close as any and Grizzly CG in W Yellowstone is great. If you mean FHU CGs then the only one in the park is Fishing Bridge, which is likely further away than W Yellowstone.
This place is huge and not a lot of roads that run through it.

Staying inside the park eliminates the long drive in and out and the waits at the entrance stations.

The best is Grizzly in West Yellowstone; there are other nice ones in West Yellowstone. It's about a 30 minute drive depending on what animals show up along the way.