Open two browser tabs and search Cedar Mill home prices in each. In one, the median for a single-family home sits near $935,000, based on August 2026 listings. In the other, the median sale price for the same neighborhood name is $667,000, drawn from January 2026 closings. Neither number is wrong. That is the problem. Cedar Mill does not have one housing market with one median. It has at least three overlapping definitions of where "Cedar Mill" even starts and stops, and a monthly sales volume so thin that a single closing can swing the number by tens of thousands of dollars.
If you are comparing Cedar Mill to Bethany or Beaverton based on a headline median, you are comparing a number that depends more on which website you happened to open than on what a house actually costs.
The same name, three different footprints
Cedar Mill is an unincorporated community, not a city, which means its edges are drawn by whoever is doing the drawing. The U.S. Census Bureau defines a Cedar Mill census-designated place with fixed boundaries: Highway 26 to the south, west of the Willamette Stone, and stretching out toward 153rd on the west and West Union Road on the north, according to Cedar Mill News. But that boundary has moved before. In 1999, the section of the CDP containing Sunset High School was annexed into the City of Beaverton, meaning a piece of land that was Cedar Mill in the 1990 census count is legally Beaverton today, based on records cited in Cedar Mill's Wikipedia entry.
Real estate portals do not use the Census boundary. Each draws its own polygon, some including newer subdivisions like Bonny Slope Estates or Cedar Mill Heights, some excluding pockets that have since been annexed into Beaverton, some folding in enough of neighboring Cedar Hills or Oak Hills to shift the mix of home ages and sizes entering the median calculation. A neighborhood name that has no legal boundary is a name three different data teams can define three different ways in the same month.
Small sample, big swings
The boundary problem compounds with a volume problem. One national portal's Cedar Mill data for January 2026 was built on just 3 closed sales that month, down from 11 the January before. A median calculated from three transactions is not a market signal. It is closer to a coin flip weighted by whichever three sellers happened to close escrow that particular month. Compare that to the same portal's broader read on Portland proper, where June 2026 alone saw 2,327 home sales citywide. At city scale, a handful of unusual transactions barely moves the needle. At neighborhood scale, especially in a smaller unincorporated pocket like Cedar Mill, one high-end custom build or one distressed sale can swing the reported median by six figures.
This is why the same source that reported $667,000 in January also reported homes selling after just 25 days on market that month, a fast pace, but on a sample too small to tell you whether that speed reflects real demand or just reflects that three specific homes happened to be priced right. A separate August 2026 snapshot from a different portal showed 57 active single-family listings in Cedar Mill priced between $605,000 and $1,980,000, with a median of $934,500. Fifty-seven listings is a real enough sample to trust directionally. Three closings is not.
What the range actually tells you
Here is the useful part buried inside the confusing part. The $605,000 to $1,980,000 spread reported in August 2026 is not noise. It is the honest shape of Cedar Mill's housing stock, which runs from mid-century ranch homes built decades ago to new construction going up right now in subdivisions like Bonny Slope Estates, where builder listings this August marketed newly completed, move-in-ready homes, and a few streets over at Cedar Mill Heights, where a model home was open for weekend tours with grand-opening incentives. A single median flattens that range into one number. The range itself is the more honest description of what your money buys.
| What you're looking at | Reported figure | Time window | What it actually reflects |
|---|---|---|---|
| Single-family median, one portal | ~$934,500 | August 2026 listings | 57 active listings, wide price spread from older stock to new construction |
| Median sale price, another portal | $667,000 | January 2026 closings | Just 3 closed sales, down from 11 the year before |
| Average price, a regional moving guide | $824,000 | Early 2026 | Broader average across the CDP, taxed at roughly 1.05% |
None of these figures contradicts the others once you know what each one is measuring. They contradict each other only if you treat "Cedar Mill" as a single, stable market instead of a name stretched across very different pockets of housing stock and inconsistent map lines.
The tax line nobody mentions on the listing sheet
There is a second, quieter reason two homes with the same address style and the same square footage can carry different long-term costs. Most of Cedar Mill sits in what Washington County calls its urban unincorporated area, a designation shared with Bethany, Aloha, Cedar Hills, and Raleigh Hills, covering roughly 220,000 residents who receive county services rather than city services, according to Cedar Mill News. Beaverton has an agreement giving it the right to eventually annex parts of that area, but the same reporting notes the city has moved slowly, absorbing only a few pockets, like the Timberland area, in a brief round of annexation in the early 2000s.
That matters at the parcel level because annexation changes the taxing layer. Washington County has multiple tax code areas, and a home's combined levy rate depends on which county, school district, city, and special district charges apply to that specific parcel, according to a guide on Washington County property taxes. Two houses a few blocks apart, both carrying the Cedar Mill name, both zoned to the same Beaverton schools, can sit on opposite sides of an annexation line without either seller's listing sheet ever mentioning it. Oregon's Measure 50 caps how fast assessed value can climb regardless of what the home sells for, but the base layer of levies still depends on whether that specific tax lot has been pulled into city limits.
What to actually do with this
Stop treating the headline median as a starting offer number. Instead:
- Ask which boundary a listing source used before comparing its Cedar Mill figure to another site's Cedar Mill figure. They are rarely the same shape on a map.
- Pull the sales count behind any median you're quoted. A number built on 3 closings deserves far less weight than one built on dozens of active listings.
- Compare price per square foot within the specific micro-area or subdivision you're actually considering, not the CDP-wide figure. A mid-century ranch near the original Cedar Mill townsite and a new build in Bonny Slope Estates are not the same product wearing the same neighborhood name.
- Confirm whether the specific parcel sits inside Beaverton city limits or in unincorporated Washington County before assuming two similarly priced homes carry the same tax trajectory.
A few questions worth asking before you compare listings
Why did one source report a lower median than another for the same month? They almost never cover the same month or the same map. One figure above reflected August 2026 active listings, the other reflected January 2026 closings on a sample of three sales. Different time windows and different sample sizes produce different numbers even when both are calculated correctly.
Is Cedar Mill part of the City of Beaverton? Most of it is not. It remains unincorporated Washington County land, though small sections, including the area around Sunset High School, have been annexed into Beaverton over the past few decades. Annexation status can differ from one parcel to the next within what buyers still call Cedar Mill.
Does a lower reported median mean Cedar Mill is getting more affordable? Not necessarily. A median built on a handful of closings can drop simply because fewer higher-priced homes closed that particular month, not because pricing power across the neighborhood actually softened.
If you're weighing a specific Cedar Mill address against homes in Bethany, Beaverton, or elsewhere on the Westside, the number that matters is the one tied to that parcel, its tax jurisdiction, and its actual comparable sales, not the CDP-wide average someone else calculated for a different purpose. ELEETE Real Estate works these micro-areas block by block, with two brokers on every transaction and the local record-keeping to tell you which median actually applies to the house in front of you. Request a strategic consultation before you anchor to a number that may not describe the home you're buying.
