Beaver is a city in Beaver County, Utah, United States. The population was 2,454 at the 2000 census. It is the county seat of Beaver County. Settled by Mormon Pioneers in 1856, Beaver was one of a string of Mormon settlements extending the length of Utah. Beaver is the birthplace of two well-known, but very different, people: Philo T. Farnsworth and Butch Cassidy. Philo T. Farnsworth was the inventor of several critical electronic devices that made television possible, including the cathode ray tube. Butch Cassidy was a notorious western outlaw.