Westlake Village Sits on a County Line: What the LA vs Ventura Side Means for Buyers

Two neighbors on opposite shores of Westlake Lake can share the same mailing address, the same ZIP code and the same view, yet live in different counties, different cities, different school districts and different sales tax jurisdictions. That is the practical reality of the Westlake Village county line, and it is the single most misunderstood fact among buyers who start a search here. Only about one third of the community sits inside the City of Westlake Village; roughly two thirds is in Thousand Oaks. If you are comparing the two sides, this guide ranks what actually changes and what does not.

Where exactly does the Westlake Village county line run?

Westlake Village was built as a single master planned community on the old Russell ranch, then split by the existing Los Angeles and Ventura county line. The Ventura County portion, 8,544 acres, was annexed into the City of Thousand Oaks in two pieces in 1968 and 1972. The Los Angeles County portion, 3,456 acres, incorporated as the City of Westlake Village in 1981 and became the 82nd municipality in Los Angeles County, according to the city's own history. The city covers just 5.4 square miles at an average elevation of 900 feet, nine miles inland from the Pacific and 38 miles west of downtown Los Angeles, with the Simi Hills to the north and the Santa Monica Mountains to the south. The 2020 census counted 8,029 residents inside city limits, which excludes everyone on the Thousand Oaks side.

On the ground, the diagonal boundary starts just northeast of Lindero Canyon Road, south of Blackbird Avenue, and runs southwest to South Westlake Boulevard at Kirsten Lee Drive, as mapped by the Conejo Valley Guide. You cannot drive, bike or walk the line because it crosses the lake itself; the western half of Westlake Lake is in Ventura County. For a street by street sense of which neighborhoods fall where, see our neighborhood by neighborhood guide to Westlake Village.

Which school district serves each side of Westlake Village, LVUSD or CVUSD?

This is the biggest practical consequence of the line for most families. The Los Angeles County side is served by Las Virgenes Unified School District, the same district that covers Agoura Hills, Calabasas and Hidden Hills. The Ventura County side is served by Conejo Valley Unified School District, which also covers Thousand Oaks and Newbury Park and was formed in 1974 from the merger of three districts, including the eastern portion of the Oxnard Union High School District.

The naming trips people up. Westlake Elementary and Westlake Hills Elementary are both Conejo Valley Unified schools, meaning they serve the Thousand Oaks side, not the City of Westlake Village. A buyer who assumes a "Westlake" school belongs to the Las Virgenes district can end up on the wrong side of the line. Attendance boundaries and any interdistrict transfer options change over time, so confirm them with each district office for the specific address before you write an offer. It is one of the first things we check for clients, and one of the points covered in what I wish every buyer knew before starting a Westlake Village search.

How does sales tax differ between the LA and Ventura sides of Westlake Village?

Sales tax is the most visible day to day difference. The California Department of Tax and Fee Administration rate table effective July 1 through September 30, 2025 listed Westlake Village at 9.750 percent and Thousand Oaks at 7.250 percent, a 2.5 point gap. Local rates do change, so pull the live CDTFA rate for the exact address before relying on any figure.

Keep it in perspective. Sales tax matters for furniture, appliances and a vehicle registered to the address. It is not the number that moves a homeowner's annual budget; property tax is. Buyers routinely overweight the sales tax gap and underweight the school district and city permitting differences.

What does the county line mean for Westlake Village property tax and transfer tax?

Westlake Village property tax works the same way on both sides. Proposition 13 sets the base rate at 1 percent of assessed value, and local voter approved bonds and special assessments are added on top. A new buyer on either side should budget slightly above 1 percent of the purchase price, with the exact figure set by the tax rate area for that parcel. Confirm it through the Los Angeles County Assessor for the city side or the Ventura County Assessor for the Thousand Oaks side. Do not use a countywide "average effective rate" as a proxy; those averages are dragged down by long held properties and do not reflect what a new buyer pays.

On the Los Angeles County side, the documentary transfer tax is $0.55 per $500 of consideration, or $1.10 per $1,000, on conveyances over $100, per the Los Angeles County Registrar Recorder. Measure ULA, the so called mansion tax of 4 percent on sales over $5 million and 5.5 percent over $10 million, applies only within the City of Los Angeles. Los Angeles County's additional city transfer taxes apply only in Culver City, Los Angeles, Pomona, Redondo Beach and Santa Monica. Westlake Village is not on that list, which matters for the luxury tier in enclaves we compare in our North Ranch, Lake Sherwood and Westlake Island buyer's guide. For the Ventura County side, confirm the current transfer tax with the Ventura County Clerk Recorder.

How do you confirm which county a Westlake Village home is in?

Not by ZIP code. The City of Westlake Village shares ZIP codes 91361 and 91362 with Thousand Oaks, and ZIP 91361 is itself split, with Ventura County listed as its primary county. A "Westlake Village, CA 91361" address can be a Thousand Oaks home with Conejo Valley Unified schools and Thousand Oaks permitting rules. The reliable method is the assessor's parcel number: look up the APN with the county assessor, and the record tells you the county, the tax rate area and the jurisdiction. That one step settles the school district and the city hall you will deal with for an addition or ADU.

The split also distorts market statistics. A "Westlake Village" median price means something different depending on whether the boundary used is city limits, the shared ZIP codes or the broader community. When you read a number, ask which definition it uses. We cover the lifestyle and pricing differences in more depth in our broker's comparison of Westlake Village and Thousand Oaks, and sellers on either side should read how to position a Westlake Village home for sale in 2026.

Frequently Asked Questions About the Westlake Village County Line