Cromwell is an unincorporated community in Pierce County, in the U.S. state of Washington. [1]
A post office called Cromwell was established in 1903, and remained in operation until 1931. [2] The community was named after J. B. Cromwell, a postal official. [3]
47°16′27″N 122°37′20″W / 47.27417°N 122.62222°W