Happy Valley is an unincorporated community in Blount County, Tennessee, United States, near the Great Smoky Mountains National Park. Although it is not a census-designated place, the ZIP Code Tabulation Area for the ZIP Code (37878) that serves Happy Valley had a population of 529 as of the 2000 U.S. Census.
Happy Valley is situated in a narrow valley of the same name on the northwestern fringe of the Great Smoky Mountains. Chilhowee Mountain- an elongate Ridge stretching for roughly 35 miles (56 km) between the Little Tennessee River and the Little Pigeon River watersheds- spans Happy Valley to the north. The valley is walled off to the south by several low ridges-namely Pine Mountain to the southwest and Hatcher Mountain to the southeast- which run roughly parallel to Chilhowee Mountain. Cades Cove is located opposite Hatcher and Pine Mountain to the south. Happy Valley Ridge provides the valley's eastern barrier, splitting it off from Lake-in-the-Sky and the Top of the World community. Gregory Bald and the main crest of the western Smokies rises beyond Pine Mountain approximately 3 miles (4.8 km) to the southwest.