Omahas, a tribe of American Indians, of the Dakotah family, settled in northern Nebraska. They were found by Marquette (1673), by Carver (1766) and by Lewis and Clark (1805). They were constantly at war with the Sioux, but since 1855 have been at peace and have improved rapidly. They cultivate the ground, and have churches and schools. Their present number does not exceed 1,200.