Portland, Oregon

Portland is the largest city in Oregon which had been the home of the parents of Walt Disney, Flora and Elias lived since Walt moved to Los Angeles. Disney composer George Bruns was also a teacher in the Lewis and Clark College in Portland, and he died in the very city on May 23, 1983. In the end of the Gravity Falls episode, Soos and the Real Girl, it's revealed that Melody lives in Portland and has to return their after the engagement party.