The Dunthorpe and Riverdale neighborhoods sit just south of Portland in unincorporated Multnomah County. Located east of Highway 43 along the Willamette River, this area is known for its large, private properties and beautiful tree-lined streets. The community is exclusively residential, with no commercial zoning, maintaining its quiet, secluded atmosphere. Lake Oswego borders to the south.
Dunthorpe features elegant homes with spacious lots, manicured gardens, and wooded surroundings. Many homes have riverfront access, while others are set back within forested areas. The neighborhood offers a mix of historic estates and modern architectural designs, providing a variety of luxury living options.
About this data. Market statistics on this page are compiled from sold and active residential listings reported to Regional Multiple Listing Service (RMLS) over the trailing 12 months. Refreshed twice daily; last refresh Sep 9, 2026 at 11:46 PM Pacific. Data deemed reliable but not guaranteed; statistics reflect listing activity reported to RMLS and may not include private, off-market, or new construction sales. © RMLS. Equal Housing Opportunity. Presented by Lovejoy Real Estate.
Turnover in Dunthorpe and Riverdale is genuinely low, often only a handful of public transactions in a year. If it is your target, work with a broker who is actively covering that area rather than relying on a search alert. The RMLS block above draws from the Arnold Creek polygon, which is the one south-metro polygon in this footprint with meaningful trailing-12-month activity; read the numbers as an Arnold Creek reference point rather than a Dunthorpe or Riverdale median.
The Dunthorpe and Riverdale area is served by the Riverdale School District, an independent district founded in 1888. Unlike most Portland-area addresses, Dunthorpe does not fall under Portland Public Schools.
The district operates two schools:
Enrollment for non-residents: Students who live outside the Riverdale School District may apply through an annual lottery. Successful applicants can enroll by obtaining an inter-district transfer from their home district or by paying tuition. The application window typically runs from September through mid-February for the following school year. See the Riverdale School District enrollment page for current details.
For independent school data:
Dunthorpe is a short drive from downtown Portland and Lake Oswego. Public transit is bus service along Highway 43 (SW Macadam Ave./OR-43). The Portland Streetcar does not extend into Dunthorpe. Lewis and Clark College sits on the west edge of the neighborhood along SW Terwilliger Boulevard, the other main artery in and out.
Dunthorpe is known for mature trees, expansive properties, and river-adjacent parks. Nearby outdoor space includes:
The market block on this page shows Arnold Creek, the one south-metro polygon here with a meaningful RMLS sample over the trailing 12 months. Dunthorpe and Riverdale sit next door but see very few recorded transactions in any given year, so RMLS medians for those polygons on their own would be volatile and are not published above. If you are shopping either community, the useful conversation is a broker’s read on what is actually available or expected to come available, not a headline median.
Dunthorpe is an unincorporated Multnomah County urban pocket that carries City of Portland zoning administered under an intergovernmental agreement. For a specific parcel, check PortlandMaps rather than the County map.