Yellowstone National Park Lodges operates the nine lodging facilities inside the park. If you choose to stay inside the park, make your reservations early! Reservations can be made online or by calling:
307-344-7311 for future reservations
307-344-7901 for same-day reservations
307-344-5395 for TDD service (Telecommunications Device for the Deaf)
They also offer great seasonal vacation packages that will help you get the most out of your national park experience.