The following list presents the full set of National Register of Historic Places listings in Multnomah County, Oregon. However, please see separate articles for listings in each of Portland's six quadrants.
Willamette Mission State Park is a state park in the U.S. state of Oregon, located about four miles (6 km) north of Keizer adjacent to the Wheatland Ferry and east of the Willamette River. It includes Willamette Station Site, Methodist Mission in Oregon, which is listed by the National Register of Historic Places.
The Isaac Neuberger House is a house located in northwest Portland, Oregon listed on the National Register of Historic Places.
The Isaac Watson House is the headquarters of the New Jersey State Society of the National Society of the Daughters of the American Revolution (DAR). It is located just outside the state capital of Trenton in Hamilton Township, Mercer County, New Jersey. It is situated on a bluff overlooking Watson's Creek and the Abbott Farm National Historic Landmark in John A. Roebling Park, a 257-acre nature preserve.
The Isaac King House and Barn, located near Philomath, Oregon, is listed on the National Register of Historic Places. The house was designed and built by William Pitman in c.1855. It is about 25 by 45 feet in plan. It has a steep, gabled roof with a boxed cornice and returns.
