Clackamas County, Oregon

Clackamas County, named after the Clackamas Indians, was one of four original districts created by the Provisional Legislature on July 5, 1843. At that time Clackamas County covered portions of four present-day states and one Canadian province. In 1844 the Columbia River was made the northern boundary of the county, and the United States-Great Britain Boundary Treaty of 1846 relocated the northern border of both the United States and Clackamas County at latitude 49 degrees. In 1853 an Act of Congress that created the Washington Territory enclosed Clackamas County within the present-day boundaries of Oregon. In 1854 Clackamas County acquired the boundaries it has today.