The Omaha (Omaha-Ponca: Umonhon) are a federally recognized Midwestern Native American tribe who reside on the Omaha Reservation in northeastern Nebraska and western Iowa, United States. There were 5,427 enrolled members as of 2012. The Omaha Reservation lies primarily in the southern part of Thurston County and northeastern Cuming County, Nebraska, but small parts extend into the northeast corner of Burt County and across the Missouri River into Monona County, Iowa. Its total land area is and the reservation population, including non-Native residents, was 4,526 in the 2020 census. Its largest community is Pender.
The Omaha people migrated to the upper Missouri area and the Plains by the late 17th century from earlier locations in the Ohio River Valley. The Omaha speak a Siouan language of the Dhegihan branch, which is very similar to that spoken by the Ponca. The latter were part of the Omaha before splitting off into a separate tribe in the mid-18th century. They were also related to the Siouan-speaking Osage, Quapaw, and Kansa peoples, who also migrated west under pressure from the Iroquois in the Ohio Valley. After pushing out other tribes, the Iroquois kept control of the area as a hunting ground.
About 1770, the Omaha became the first tribe on the Northern Plains to adopt equestrian culture. Developing "The Big Village" (Ton-wa-tonga) about 1775 in current-day Dakota County in northeast Nebraska, the Omaha developed an extensive trading network with early European explorers and French Canadian voyageurs. They controlled the fur trade and access to other tribes on the Upper Missouri River.
Omaha, Nebraska, the largest city in Nebraska, is named after them. Never known to take up arms against the U.S., the Omaha assisted the U.S. during the American Civil War.
The Omaha tribe began as a larger Eastern Woodlands tribe comprising both the Omaha, Ponca and Quapaw tribes. This tribe coalesced and inhabited the area near the Ohio and Wabash rivers around year 1600. As the tribe migrated west, it split into what became the Omaha and the Quapaw tribes.