O'Neill is a city in Holt County, Nebraska, United States.

[1] According to the United States Census Bureau, the city has a total area of 2.38 square miles (6.16 km2), all land.

[10] Cattle, potatoes, tomatoes, soybeans and corn are the major products produced near this town.

[citation needed] O'Neill was the venue for one of the first boundary layer experiments, Project Prairie Grass.

[13] It was conducted during the summer of 1956 and funded by the Geophysics Directorate of the Air Force Cambridge Research Center.

The experiment measured the diffusion of a tracer and the state of turbulence in the lower boundary layer of the atmosphere.

[14] Teams from Massachusetts Institute of Technology, University of Wisconsin, Texas A and M, and the Air Force Cambridge lab were involved.

Saint Patrick's Day and the Summerfest in July are the town's main celebrations.

The FM band plays country music along with all the local news from the surrounding towns, while the AM band plays classic rock with a polka ("milking music") hour in the morning.

Until 1992, O'Neill was served by the Chicago and North Western Transportation Company.

[19] O'Neill is also served by a former Chicago, Burlington & Quincy branch line from the Sioux City, Iowa vicinity.