Its name was given to it by its founder, Jim Butler, and it is thought to be a Shoshone Indian word, pronounced "tow-nu-paw". Although the town previously had a variety of names, including Butler City, Jim Butler's name remained. It is said to mean "hidden spring".
In the 2000 census the population was 2,627 and the CDP has a total area of 16.2 square miles (42 km2), all land.
-Wikipedia