Two listings go up the same week, both addressed on streets a few blocks apart, both carrying the 91361 ZIP code, both marketed as Westlake Village. A buyer comparing them assumes they're shopping the same market. They aren't. One sits inside the incorporated City of Westlake Village, which is entirely in Los Angeles County. The other sits across an invisible line inside the City of Thousand Oaks, which is in Ventura County. Same name on the sign. Different county, different school district, and by the time escrow closes, a different tax bill.
This isn't a quirk you'll find flagged on a listing sheet. It's baked into how the community was built, and it changes what a "median price for Westlake Village" actually means depending on which data source drew the boundary.
One Name, Two Governments
Westlake Village started as a single master-planned community simply called Westlake, built around a private lake beginning in the 1960s. As the development grew, roughly two-thirds of it was annexed into the City of Thousand Oaks in two rounds, in 1968 and 1972. The remaining third incorporated on its own in 1981 as the City of Westlake Village. That's the entire origin of the split: one project, cut into pieces by annexation timing, decades before most current buyers were house hunting.
The boundary itself isn't tidy. It crosses the Westlake Golf Course roughly halfway between Lakeview Canyon and Lindero Canyon roads, and it cuts through half of Westlake Lake itself. Even the lake doesn't belong to one county. A common point of confusion locally is that Lake Sherwood, a few miles away, is sometimes assumed to be part of Westlake Village. It isn't. Lake Sherwood sits on the Thousand Oaks and Ventura County side, a separate body of water entirely.
What Actually Changes Depending on Which Side You're On
| Los Angeles County side (City of Westlake Village) | Ventura County side (within Thousand Oaks) | |
|---|---|---|
| School district | Las Virgenes Unified, feeding Lindero Canyon Middle and Agoura High | Conejo Valley Unified, feeding Colina Middle and Westlake High |
| Governing city | City of Westlake Village | City of Thousand Oaks |
| Assessment roll | Tracked as its own line item by the LA County Assessor | Folded into the countywide Ventura roll for Thousand Oaks |
| Effective property tax range | Commonly runs 1.15% to 1.35% once voter-approved bonds are added to the Prop 13 base | Commonly runs 1.05% to 1.45%, wider because Mello-Roos assessments show up in some newer tracts |
| Named subdivisions cited in this piece | The incorporated core surrounding the eastern half of the lake, home to Dole Food Company's headquarters | Foxmoor, Foxmoor Hills, and Whitehawk in North Ranch |
Both districts are considered strong. The point isn't that one side wins. The point is that a home's mailing address tells you nothing about which government actually taxes it or which school it feeds into.
Why the Median Price You See Depends on Whose Boundary Line Was Used
Here's where it gets consequential for a buyer running comps. Search "Westlake Village home prices" and you can pull two entirely different numbers depending on how the listing source draws the map. One approach treats Westlake Village as the incorporated city limits only, which is entirely on the Los Angeles County side. In the three months ending in May 2026, that boundary produced a median sale price around $1.8 million, up sharply from the same period a year earlier. A second approach treats "Westlake Village" as the informal community name, which pulls in the Thousand Oaks neighborhoods on the Ventura County side, places like Foxmoor. Pulled from that same window, the boundary produced a median closer to $1.41 million.
That's a gap of nearly $400,000 between two numbers that both claimed to describe "the Westlake Village median" earlier this year. Neither was wrong. They were measuring different footprints, and the gap illustrates the mechanism even if you're pulling fresh numbers today: whichever boundary a source uses will keep producing a different answer than the one next door. A buyer who pulls one figure and assumes it applies to every home carrying the Westlake Village name is comparing apples that grew on opposite sides of a fence.
The assessment records make the split even more explicit. The Los Angeles County Assessor tracks Westlake Village as its own entity, 3,630 parcels that rose 2.5% in value on the 2026-27 assessment roll, part of a Los Angeles County-wide increase of roughly 4.40%. The Ventura County side doesn't get a comparable standalone line. Because the Thousand Oaks neighborhoods that carry the Westlake Village name aren't a separate incorporated city, their parcels are simply part of the broader Ventura County roll, which topped $194 billion for 2026-27. One side of the community has its own scorecard. The other is a subset of a much bigger one.
The Tax Bill Splits Along the Same Line
Both counties start from the same place. Proposition 13 caps the base property tax at 1% of assessed value statewide, with annual increases limited to about 2% until a sale triggers reassessment. What diverges is everything layered on top. On the Los Angeles County side, voter-approved bonds typically push the effective rate to somewhere between 1.15% and 1.35%. On the Ventura County side, the range runs wider, roughly 1.05% to 1.45%, because some newer tracts carry Mello-Roos Community Facilities District assessments that older neighborhoods don't.
That last detail matters for anyone comparing an older Ventura-side home to a Los Angeles-side one. Foxmoor, one of the founding Thousand Oaks-side neighborhoods carrying the Westlake Village name, was built in the late 1960s through the early 1970s, well before Mello-Roos financing existed as a tool. Established tracts like it typically don't carry that special assessment at all. Newer construction elsewhere in Ventura County might. The rate spread isn't about which county is cheaper across the board. It's about whether the specific parcel sits inside a financing district, and that's a fact tied to the tract, not the ZIP code.
What This Means If You're Comparing Two "Westlake Village" Listings
If you're actively comparing homes that both carry the Westlake Village name, a few steps save you from a surprise later:
- Pull the parcel number and confirm the county with the assessor's office before you get attached to a comp.
- Run the exact address, not the neighborhood name, through the relevant school district's own boundary locator. LVUSD and CVUSD both maintain these, and the line can run between adjacent streets.
- Ask what boundary a quoted "median price" is built on. A number pulled from the incorporated city limits and a number pulled from the broader community name are not interchangeable.
- Check for a Mello-Roos or CFD line item on the property's actual tax bill rather than assuming based on the neighborhood's age. Verify with the county, not with a rule of thumb.
None of this determines which home is the better fit. It determines whether you're comparing them on equal footing.
A Few Questions Worth Settling Early
Does living on one side of the line affect resale value? Not by itself. Differences in list-to-sale performance across the two sides trace back to lot size, home age, and specific location within each area, not the county line as a standalone factor. What the line does affect is carrying cost, which is a separate conversation from resale value.
How do I find out which side a specific address falls on? The county assessor's parcel lookup is the most direct route. Local school districts also maintain their own address-based locators, which is the more reliable check if schools are part of your decision.
Is one school district considered stronger than the other? Both Las Virgenes Unified and Conejo Valley Unified are widely regarded as strong districts. The right one for your family comes down to specific schools and programs, not a general quality gap between the two.
If you're comparing homes across this line and want someone who can pull the actual parcel, confirm the district, and tell you which comps genuinely apply to the property in front of you, that's the kind of groundwork Aimee McKinley does before a client ever writes an offer. Request a free home valuation and get a straight answer on which side of Westlake Village your next home actually sits on.
