Niobrara County is a county located in the U.S. state of Wyoming As of 2000, the population is 2,407, making it the state's least populous county.
Niobrara County is a county, the population is 2,407. This county is located in the U.S. state of Wyoming As of 2000. Niobrara County is a county, the population is making it the state's least populous county. This county is located in the U.S. state of Wyoming As of 2000.