Leavenworth is a city in Chelan County, Washington, United States. It is part of the Wenatchee–East Wenatchee Metropolitan Statistical Area. The population was 1,965 at the 2010 census. The entire town center is modelled on a Bavarian village.
The first route across Stevens Pass was built by the Great Northern Railway in 1892. The townsite was across the Wenatchee River from Icicle and was named Leavenworth the same year the rail construction began. Captain Charles Leavenworth, president of the Okanogan Investment Company, purchased the land in the present-day downtown and laid the streets parallel to the new railroad tracks.
The railroad construction was completed during the winter of 1893. Lafayette Lamb and his brother, Chauncery Lamb arrived in 1903 from Iowa to build the second largest sawmill in Washington state.