According to the United States Census Bureau, the town has a total area of 0.4 square miles (1.0 km2), all land.

In the year 1892, additional businesses included a saw and grist mill, general store, and a blacksmith shop.

[5] An undated advertisement for Omaha indicated the town was along the Missouri Pacific Railroad and "State Highway 65".

The advertisement described churches of every main denomination, that the town had electric and telephone service, a bank, canning factory, feed stores, a machine shop, mill, a modern garage, lumber yards and various types of stores.

[6] In the 1930s, the town attempted to qualify as a border city due to its proximity to the Arkansas/Missouri state line.

Although the new U.S. Route 65, opened in late 1999, was judged to be safer and reduced travel time, it completely bypassed Omaha.

Businesses deriving revenue from the tourist trade felt the impact on the first day of the new road opening.

[7] Former University of Arkansas football All-American Brandon Burlsworth is buried at Gass Cemetery in Omaha.

The racial makeup of the town was 95.76% White, 0.61% Black or African American, and 3.64% from two or more races.