Yellowstone National Park Service GovernmentCampingFishingOutdoor RecreationTourism Attractions Yellowstone National Park Service Visit Website PO Box 168 Yellowstone National Park, WY 82190 (307) 344-7381 (307) 344-2014 (fax) Hours: North Entrance open year round. All other entrances are seasonal. About Map About The world's first national park. Explore mountains, forests, and lakes to watch wildlife and witness the drama of the natural world unfold. “For the benefit and enjoyment of the people.” What's Nearby? Distance: 5 10 15 20 25 50 mi.