Two buyers are shopping the same price bracket in Bothell this month, both eyeing homes just under $1 million, both assuming they're comparing apples to apples because the address says the same city. One of them can finance the purchase with a standard conventional loan. The other, buying a house four blocks away, gets quoted jumbo rates because their file crosses a threshold the first buyer never touches. Nothing about the house changed. The county did.
Bothell is one of the few cities in the Puget Sound region that sits inside two counties at once, and the boundary between them runs through the middle of town, not around its edges. That single fact reshapes property taxes, mortgage financing, and even how much a buyer pays for what looks, on paper, like an identical home. Most market write-ups treat Bothell as one number. It behaves like two.
The line running through the middle of town
The King-Snohomish county line cuts across Bothell roughly along 240th Street SE, close to the University of Washington Bothell campus. South of that line, you're in King County. North of it, you're in Snohomish County. The split maps cleanly onto ZIP codes: 98011 sits in King County and covers Canyon Park, Norway Hill, and most of south Bothell. ZIP codes 98012 and 98021 sit in Snohomish County and cover North Bothell, Canyon Creek, and Thrashers Corner.
Both sides share a city government, a downtown, and for most addresses, the Northshore School District. What they do not share is a county assessor, a treasurer, or the underlying rules that determine how much a given loan will cost.
A buyer near the $1 million mark can find their file treated as conventional financing on one side of Bothell and jumbo financing on the other, without the house itself changing at all.
That's the detail that gets lost in every citywide market report.
What the median is actually blending together
Over the three months ending in May 2026, the median sale price across Bothell was $999,000, down 13.1 percent from the same period a year earlier, according to Redfin. Homes were selling in an average of 10 days, up from 6 days the year before, and the average sale price per square foot had fallen to $472, also down from last year.
That number is real, but it's an average of two submarkets that don't behave the same way. A King County listing in Canyon Park and a Snohomish County listing in Thrashers Corner both get folded into that $999,000 figure, even though one carries a different tax bill, a different financing ceiling, and, as we'll get to, a different price tag for the same square footage.
Here's what actually splits along the county line in 2026:
| King County side (98011) | Snohomish County side (98012, 98021) | |
|---|---|---|
| Neighborhoods | Canyon Park, Norway Hill | North Bothell, Canyon Creek, Thrashers Corner |
| Effective property tax rate | Roughly 0.82% | Roughly 0.80% |
| 2026 conforming loan limit | $977,500 | $833,750 |
| Local REET add-on | 0.50% | 0.50% |
| Where documents record | King County Recorder, Seattle | Snohomish County Auditor, Everett |
Two rows on that table look almost identical. One does not, and it's the one most buyers never think to check before they fall in love with a house.
The conforming loan limit is the part buyers miss
Conventional mortgages are priced against a ceiling set annually by the Federal Housing Finance Agency, and that ceiling is set county by county, not city by city. For 2026, King County's conforming loan limit is $977,500. Snohomish County's is $833,750. That's not a small gap. It's a $143,750 difference in how much a buyer can borrow before their loan gets reclassified as jumbo, which typically means a higher rate, larger reserve requirements, and a more demanding underwriting file.
For a buyer shopping in the $850,000 to $1 million range in Bothell, which describes a large share of the current market given that median sale price, the county line isn't a footnote. It's the difference between a loan that prices like every other conventional mortgage in the region and one that gets shopped to a smaller pool of jumbo lenders. Two houses at the same price point, on the same street grid, in the same school district, can require two entirely different conversations with a lender depending on which side of 240th Street SE they sit on.
This is worth confirming before you fall for a specific listing, not after. A quick address lookup with the King County Assessor or the Snohomish County Assessor tells you which set of rules applies, and it's worth doing before you get attached to a floor plan.
The address premium: what King County actually buys you
Property tax and loan limits explain part of the county line's effect. Buyer psychology explains the rest. Listings on the King County side, particularly in Norway Hill and Canyon Park, consistently trade at a premium of roughly 3 to 5 percent over comparable Snohomish County inventory in North Bothell or Thrashers Corner. The homes aren't meaningfully different in construction era, lot size, or finish level. The premium tracks the ZIP code's proximity to Kirkland's real estate identity more than anything about the structure itself.
That's a real cost for buyers chasing the King County side on reputation alone, and it's a real opportunity for buyers willing to look one ZIP code north. A Snohomish County property in Canyon Creek or Thrashers Corner buys more house, and often more land, for the same monthly payment, once you also factor in the slightly lower effective tax rate.
What does not change when you cross the line
It would be easy to assume the county line touches everything, and it's worth being precise about what it leaves untouched. Washington's Real Estate Excise Tax is a state-level graduated tax, and both King and Snohomish counties add the identical 0.50 percent local rate on top of it. A seller closing a $900,000 sale pays the same combined REET rate whether the property sits in Canyon Park or Canyon Creek. The paperwork itself does route differently, King County filings go through the King County Recorder in Seattle, Snohomish County filings through the Snohomish County Auditor in Everett, but that's a logistics difference for your escrow officer to manage, not a cost difference for you.
That distinction matters because it keeps the story honest. The county line changes financing and annual carrying costs in ways buyers should actually plan around. It does not change what you owe the state when you sell.
If you're selling, which side are you pricing from?
Sellers on the Snohomish County side sometimes underprice against King County comparables that don't actually apply to their buyer pool, and sellers on the King County side occasionally assume the premium is automatic rather than earned by presentation. Pricing a Bothell listing well means knowing which comparables genuinely apply, which requires knowing which side of 240th Street SE you're building your comp set from in the first place.
Frequently asked questions
How do I find out which county my Bothell address is in? Check your ZIP code first. Addresses in 98011 are King County. Addresses in 98012 and 98021 are Snohomish County. For confirmation on a specific parcel, both the King County Assessor and the Snohomish County Assessor offer free address lookups.
Does the county line affect which schools my kids attend? Not usually. Northshore School District boundaries cross the county line and include homes on both sides, so most Bothell addresses stay in the same district regardless of which county collects the tax bill. Always confirm boundary assignment for a specific address before you buy.
Does the county line change what I pay in excise tax when I sell? No. Washington's state Real Estate Excise Tax is graduated by sale price, and both King and Snohomish counties currently add the same 0.50 percent local rate on top of it. The county line changes your recorder's office, not your excise tax bill.
Bothell's citywide numbers tell you where the market has been. They don't tell you which side of an invisible line your next mortgage payment, tax bill, or offer strategy should be built around. That's a conversation worth having before you write an offer, not after your lender flags it. Team NSRG works both sides of the county line every week and can walk you through what it actually means for your specific address. Schedule a consultation and we'll pull the numbers for the exact parcel you're considering.
