The name Glenwood was first used for this locale around 1880. Glenwood post office was established in 1886, though it was not always in the same location. In the 1920s, the Gales Creek and Wilson River Railroad had a terminal station there named "Aagard" (or "Aagaard") after Olaf Aagard, owner of the Aagard Lumber Company. The name of the station was soon changed to Glenwood to match the post office.
Glenwood has a Forest Grove mailing address, but the Postal Service will deliver mail addressed to Glenwood, Oregon. The ZIP code is 97116.