Pateros pə-TARR-əs is a city in Okanogan County, Washington, United States. The population at the 2020 census was 593. Pateros was ori…Pateros pə-TARR-əs is a city in Okanogan County, Washington, United States. The population at the 2020 census was 593. Pateros was originally established as Ive's Landing in around 1886 by Lee Ives. Ives began farming the area near the confluence of the Methow and Columbia Rivers, which was populated by a small band of Native Americans and around 20 Chinese miners. Ives also built an 18-room hotel at the town site and operated a ferry crossing. The first post office was built in 1895.