There are Post Offices at the following locations:
Mammoth Hot Springs - Open year-around excluding holidays from 8:30 a.m. to 5:00 p.m. weekdays. Closed Saturday and Sunday.
Old Faithful - Open from early-May to late-October
Grant Village - Open from mid-May to mid-September
Lake Village - Open from mid-May to mid-October
Canyon Village - Open from late-May to mid-September
Did You Know?
There are more people hurt by bison than by bears each year in Yellowstone. Park regulations state that visitors must stay at least 25 yards away from bison or elk and 100 yards away from bears.