Two houses, half a mile apart, same builder-era finishes, same three-car garage, same territorial view toward Mount Hood on a clear day. One buyer closes and gets a property tax bill from the City of Tigard. The other buyer, on a street that looks identical from the curb, gets a bill from Washington County only. Neither agent mentioned it during the showing, because from the driveway there is nothing to mention. The line that decides which bill you get runs through the middle of the hill, and it does not show up on a listing photo.
Most buyers comparing Westside neighborhoods have already found the median price on a portal. What they have not found is that Bull Mountain, as a place, is not one governed jurisdiction. It is a patchwork of incorporated Tigard and unincorporated Washington County, stitched together over two decades of annexation fights that never fully resolved. That patchwork changes your tax bill, your school assignment, and which agency answers the phone if you call for a police report. None of it shows up in the median.
Where the boundary came from
The split is not new and it was not quiet. In 2004, Tigard put a ballot measure to voters asking to annex the entire unincorporated Bull Mountain area. City voters favored it. Unincorporated Bull Mountain voters rejected it by a wide margin, and a resident group called Friends of Bull Mountain formed specifically to fight the city's proposed voting method in court. Two years later, Bull Mountain residents tried the opposite move: incorporating as their own city to avoid annexation altogether. That referendum failed too, by a margin of 1,734 votes to 1,887.
Since then, Tigard has annexed the hill in pieces rather than all at once, which is how you end up with what city planners call "islands," parcels of unincorporated county land completely surrounded by city limits. In 2017, the city identified 77 homes sitting in these islands, including 53 in a single pocket south of Bull Mountain Road, according to reporting in the Portland Tribune. At an open house on the annexation, longtime unincorporated resident Nate Schmitz summed up the resistance plainly:
"I don't need more services, right?"
The city council eventually approved annexing several of those islands, effective June 2020, but a state law called HB 2760 requires a three-year delay before annexed residents see their tax and utility bills change. That is a detail worth knowing if you are buying a property that shows as recently annexed. The lower bill you see in a seller's disclosure may not be the bill you get.
The school district split you cannot see on a map
Address alone will not tell you which school district a Bull Mountain property is assigned to, and that surprises people who assume the whole hill feeds one system. The majority of Bull Mountain sits in the Tigard-Tualatin School District 23J, which also serves Tualatin, Durham, and King City. A northern portion of the hill, however, is assigned to the Beaverton School District 48J instead, a different district entirely with its own boundaries, calendar, and enrollment process.
This is not a quality judgment. It is a boundary fact. If you are comparing two Bull Mountain listings that look interchangeable on paper, confirm the assigned district for each specific address before you assume they match. A few streets can be the entire difference.
One hill, two tax bills
Property tax is where the boundary shows up as a real number, and the numbers vary more than most buyers expect within what feels like one neighborhood. Current Washington County assessment data puts Tigard's citywide median effective property tax rate at 0.80 percent, but that figure is not uniform across the city. The 97224 zip code, which covers part of the Bull Mountain area, carries a median effective rate of 1.18 percent, the highest of any zip code in Tigard, with a median tax bill of $9,766. That gap traces back to differing school district levies and local assessment districts layered on top of the base county rate.
| Jurisdiction | Current median effective property tax rate |
|---|---|
| Washington County overall | 0.84 percent |
| Tigard citywide | 0.80 percent |
| Tigard's 97224 zip (partial Bull Mountain) | 1.18 percent |
Unincorporated Bull Mountain properties, by contrast, pay the county base levy without the added city and local assessment layers that come with incorporation. That means a property still outside Tigard limits and a nearly identical property that has been annexed can carry noticeably different annual tax bills for the life of the ownership, not just at closing. Worth adding: the zip code split (97223 in the north, 97224 in the south, per Tigard's own boundary description) does not track the city and county line cleanly either. Some unincorporated Bull Mountain addresses use 97223, and city limits cut across both zips. Zip code is a mailing convenience, not a jurisdiction map. Do not use it as a shortcut.
What the price data is actually telling you
Here is where the boundary story connects to what buyers actually feel in a transaction. Citywide, Tigard's housing market softened over the past year. Redfin's data for the three months ending April 2026 puts the median sale price at $575,000, down 8.0 percent from the same period a year earlier, with homes selling in a median of 36 days. Movoto's August 2026 figures show Tigard's citywide median list price at $651,000, down roughly 4 percent from a year earlier.
The Bull Mountain hillside itself has not moved with that trend. Redfin's most recently published figures for the East Bull Mountain sub-market, covering February 2026, show a median sale price of $823,000, up 17.8 percent from a year earlier. But days on market nearly doubled over the same period, from 66 days to 101 days, on a much smaller pool of transactions.
Read those two numbers together rather than separately. Price rising while time-to-sale nearly doubles usually means one of two things: sellers are testing higher numbers than the pool of qualified buyers at that price point can absorb quickly, or the properties trading are a genuinely different, higher-end slice of the hill than sold the year before. Either way, it tells a buyer that the sticker price on a Bull Mountain listing right now deserves a harder look at how long it has actually sat, not just what it is asking.
Before you write an offer
If you are seriously comparing a Bull Mountain property, a few minutes of verification up front saves a surprise at closing:
- Confirm whether the specific address sits inside Tigard city limits or in unincorporated Washington County. The seller's disclosure or a title report will show this.
- Ask which school district the property is assigned to. Do not assume based on a neighboring street.
- Pull the current property tax statement and check whether the effective rate looks closer to the citywide median or the higher 97224 figure. If the property was recently annexed, ask whether the HB 2760 delay period is still in effect.
- Confirm which agency provides police service to the address. Fire and EMS coverage is unified across the hill through Tualatin Valley Fire & Rescue regardless of jurisdiction, but police response is not.
- If you are buying in an unincorporated pocket, ask whether it sits within an island fully surrounded by city limits. Those parcels have historically been annexed over time, and it changes the long-term cost picture even if nothing changes on closing day.
Frequently asked questions
How do I find out if a specific Bull Mountain address is inside city limits? The county assessor's parcel record and a preliminary title report will both state the jurisdiction plainly. Your agent or title company can pull this before you write an offer.
Does being in an unincorporated island affect resale value? It affects carrying cost and service access more directly than it affects the sale price itself. Buyers researching the property later will find the same jurisdiction information you did, so it is not a hidden liability, just a detail worth having answered rather than assumed.
Why did the annexation votes fail twice if incorporation would have given residents more control? Turnout and tax exposure were the deciding factors both times. Voters in 2004 and 2006 were weighing added services against added tax liability, and in each case a majority preferred the status quo of county governance to either alternative.
Bull Mountain rewards buyers who ask about the boundary before they fall for the view. If you are comparing properties on the hill and want the jurisdiction, tax, and school assignment sorted out before you write an offer, Julie Williams can walk you through the specific parcel records for any address you are considering. Schedule a consultation.
