Their territory extended from near Yankton, South Dakota , south to Rulo, Nebraska, and up to 150 miles west, an area of 35,600,000 acres. They had villages at Homer and Bellevue, Nebraska and probably several other locations up and down the river. Every eight to fifteen years they moved their village of 50-100 lodges to clean ground and new hunting areas.  In the beginning, it was their custom to build bark lodges; however, this was replaced with idea of teepees borrowed from the Sioux and earthen lodges borrowed from their allies, the Pawnee. 

The tribe usually wore breech-cloths, buckskin dress, and moccasins.  The men wore their hair in a scalp-lock, usually having the rest of the hair braided and hanging down on each side of their head.  Polygamy was practiced, but the maximum number of wives that any one man could have was three.  They are also the originators of the picturesque Omaha dance which soon became common to most of the plains tribes.

The Omaha were thriving as hunters and farmers when they first encountered white fur traders around 1750 in the Bellevue area.  Buffalo served as their primary provision, providing food, clothing, blankets, rope, moccasins, fuel, shelter, and utensils.   To supplement their diet, the Omaha also planted gardens containing, corn, beans, squash and melons.

In 1780, the Omaha tribe had almost 3,000 members but by 1802 they had decline to a  mere 300 due to sickness and warfare.  The Omaha were settled in what is now Dakota County, Nebraska when Lewis and Clark came upon them in 1804. 

The Omaha lived under the protection of the powerful Pawnee, who claimed the whole Platte region. Since they occupied a subordinate position, they have never been as prominent in tribal history.