Bar Nunn is a town in Natrona County, Wyoming, United States.

It is a part of the Casper, Wyoming Metropolitan Statistical Area.

[8] According to the United States Census Bureau, the town has a total area of 2.10 square miles (5.44 km2), all land.

The racial makup of the town was 93.80% White, 0.53% African American, 1.18% Native American, 0.11% Asian, 0.53% Pacific Islander, 2.03% from other races, and 1.82% from two or more races.

[4] Of the 315 households 46.0% had children under the age of 18 living with them, 66.7% were married couples living together, 7.9% had a female householder with no husband present, and 20.0% were non-families.

Public education in the town of Bar Nunn is provided by Natrona County School District #1.

In 2006, Bar Nunn led the state of Wyoming in population growth.

[10] The large growth in Bar Nunn and Natrona County has been attributed to a boom in Wyoming's energy sector.