Question: KGVA serves residents of an Indian reservation with how many enrolled members in 2010

Context paragraphs:
Turtle Mountain Band of Chippewa Indians: The Turtle Mountain Band of Chippewa Indians (Ojibwe language: Mikinaakwajiw-ininiwag) is a Native American tribe of Ojibwa and Métis peoples, based on the Turtle Mountain Indian Reservation in Belcourt, North Dakota.  The tribe has 30,000 enrolled members.  A population of 5,815 reside on the main reservation and another 2,516 reside on off-reservation trust land (as of the 2000 census).  It is federally recognized and Wayne L. Keplin is the current Tribal Chairman elected for 2016 to 2018 term.

Colorado River Indian Tribes: The Colorado River Indian Tribes is a federally recognized tribe consisting of the four distinct ethnic groups associated with the Colorado River Indian Reservation: Chemehuevi, the Mohave, Hopi, and Navajo.  The tribe has about 4,277 enrolled members.

United States v. Quiver: United States v. Quiver, 241 U.S. 602 (1916) is a case decided by the United States Supreme Court after first appearing in United States District Court for the District of South Dakota.  The case argued on February 28, 1916 and decided on June 12, 1916 concerned adultery committed on the Pine Ridge Indian Reservation in South Dakota between two enrolled members of the Oglala Sioux Tribe.  The district court had held that adultery committed by an Indian with another Indian on an Indian reservation was not punishable under the act of March 3, 1887, c. 397, 24 Stat.  635, now § 316 of the Penal Code.  This decision was made because the offense occurred on a Sioux Indian reservation which is not said to be under jurisdiction of the district court.  The United States Supreme Court affirmed the judgment of the district court saying that the adultery was not punishable as it had occurred between two American Indians on an American Indian reservation.

Hualapai: The Hualapai (pronounced Wa-la-pie) is a federally recognized Indian tribe in Arizona with over 2300 enrolled members.  Approximately 1353 enrolled members reside on the Hualapai Indian reservation, which spans over three counties in Northern Arizona (Coconino, Yavapai, and Mohave).

Iron Crow v. Oglala Sioux Tribe: Iron Crow v. Oglala Sioux Tribe of Pine Ridge Reservation, 231 F.2d 89 (8th Cir.1956), was a case where the plaintiffs challenged the authority of Indian tribal courts; the matter involving both adultery and tax assessment was heard by the United States Court of Appeals for the Eighth Circuit.  Two of the plaintiffs, both enrolled members of the Oglala Sioux Tribe, Marie Little Finger and David Black Cat were tried and convicted in the Oglala Sioux Tribal court of the crime of adultery, under the Revised Code of the Oglala Sioux Tribe.  The third plaintiff in the case Thomas Iron Crow, also an enrolled member of the Oglala Sioux Tribe challenged the jurisdiction of the tribal court to enforce the collection of a tax assessed against parties who were none-members of the tribe who leased grazing rights from him on his allocated land on the reservation.

Gros Ventre: The Gros Ventre ( ; from French: "big belly"), also known as the A'ani, A'aninin, Haaninin, and Atsina, are a historically Algonquian-speaking Native American tribe located in north central Montana.  Today the Gros Ventre people are enrolled in the Fort Belknap Indian Community of the Fort Belknap Reservation of Montana, a federally recognized tribe with 3,682 enrolled members, that also includes Assiniboine people or Nakoda people, the Gros Ventre's historical enemies.  The Fort Belknap Indian Reservation is in the northernmost part of Montana, just south of the small town of Harlem, Montana.

Wind River Tribal College: WRTC is a Tribally charted college located in Fort Washakie, Wyoming.  The campus is on the Wind River Indian Reservation in central Wyoming.  WRTC serves residents of the Wind River Indian Reservation and surrounding communities.  WRTC’s enrollment consists of mostly Northern Arapaho and Eastern Shoshone students.

Fort Belknap Indian Reservation: The Fort Belknap Indian Reservation is shared by two Native American tribes, the A'aninin ("Gros Ventre") and the Nakota ("Assiniboine").  The reservation covers 1,014.064 sqmi , and is located in north central Montana.  The total area includes the main portion of their homeland, as well as off-reservation trust land.  The tribes reported a total of 2,851 enrolled members in 2010.  The largest city on the reservation is Fort Belknap Agency, at the reservation's north end.  This is just south of the city of Harlem across the Milk River.

Rocky Boy's Indian Reservation: Rocky Boy's Indian Reservation is one of seven American Indian reservations in the U.S. state of Montana.  Established by an act of Congress in 1916, it was originally intended for landless Chippewa (Ojibwe) Indians in the American West, but has grown to include many Cree (Nēhiyaw) and Métis over the years.  The reservation is located in Hill and Chouteau counties in northeastern Montana, about 40 mi from the Canada–U.S. border.  It has a total land area of 171.4 sqmi , which includes extensive off-reservation trust lands.  The reservation is reported to have 6,177 enrolled members.

KGVA: KGVA (88.1 FM), is a public radio station in Fort Belknap Agency, Montana, serving residents of the Fort Belknap Indian Reservation.  Programming on KGVA consists of local programming (including native, oldies, Top 40 and Adult Contemporary music), plus programs from National Public Radio and Native Voice One.

Supporting paragraphs: KGVA Fort Belknap Indian Reservation
Answer: 2,851