Indigenous peoples of Arizona are the Native American people of the state of Arizona. These include people that have lived in the region since time immemorial; tribes who entered the region centuries ago, such as the Southern Athabascan peoples; and the Pascua Yaqui who settled Arizona in mass in the early 20th century, though small communities had been in the region for hundreds of years prior. Arizona has the third largest Native American population of any U.S. state. Almost a quarter of Arizona is reservation land. The Navajo Nation has the largest reservation in the United States, and the Tohono O'odham Nation in southeast Arizona has the second-largest reservation. There are 17 federally recognized tribes completely within the borders of Arizona, and 5 more in Arizona whose territory spans multiple states. Of these, 20 tribes are members of the Inter-Tribal Council of Arizona (ITCA). Native American tribes in Arizona today [[File:Sacaton-Marker-Gila River Indian Reservation-2.jpg|200px|thumb|Historic Marker which reads: <small>'Gila River Indian Reservation (established 1859) Here the first Indian school was established by the government for the Pimas and Maricopas</small>.]] Ak Chin Indian Community of the Maricopa (Ak Chin) Indian Reservation, Arizona Cocopah Tribe of Arizona Fort McDowell Yavapai Nation, Arizona(formerly the Fort McDowell Mohave-Apache Community of the Fort McDowell Indian Reservation) Gila River Indian Community of the Gila River Indian Reservation, Arizona Havasupai Tribe of the Havasupai Reservation, Arizona Hopi Tribe of Arizona Hualapai Indian Tribe of the Hualapai Indian Reservation, Arizona Kaibab Band of Paiute Indians of the Kaibab Indian Reservation, Arizona Pascua Yaqui Tribe of Arizona Salt River Pima-Maricopa Indian Community of the Salt River Reservation, Arizona San Carlos Apache Tribe of the San Carlos Reservation, Arizona San Juan Southern Paiute Tribe of Arizona Tohono O'odham Nation of Arizona(formerly Papago Indian Tribe'') Tonto Apache Tribe of Arizona White Mountain Apache Tribe of the Fort Apache Reservation, Arizona Yavapai-Apache Nation of the Camp Verde Indian Reservation, Arizona Yavapai-Prescott Tribe of the Yavapai Reservation, Arizona Multiple states: Colorado River Indian Tribes of the Colorado River Indian Reservation, Arizona and California (These include Chemehuevi, Mojave, Hopi, and Navajo people) Fort Mojave Indian Tribe of Arizona, California & Nevada Navajo Nation, Arizona, New Mexico & Utah Quechan Tribe of the Fort Yuma Indian Reservation, California & Arizona Zuni Tribe of the Zuni Reservation, New Mexico Indigenous ethnic groups who lived in Arizona Several of the Colorado River tribes are headquartered across the state