Leavenworth is a city in Chelan County, Washington. The population was 2,263 at the 2020 census. Packed with charm, lively festivals, delicious food, unique tours, and year-round fun, Leavenworth, Washington is your unforgettable mountain escape. Nestled in the Cascade Mountains, it offers endless adventures in every season—an experience that’ll have you saying, Holy Schnitzel!