“Westlake Village” is two different things, and the difference matters. The incorporated City of Westlake Village sits in Los Angeles County. But a large area with a Westlake Village mailing address sits across the county line in Ventura County, inside the City of Thousand Oaks. Same name on the envelope, different city, different county, different school district, different police and fire agency. This trips up more buyers than any other single thing in our market.
How this happened
Westlake was developed as a single master-planned community starting in the 1960s, and the developer laid it out across a county line that had been drawn long before and had nothing to do with the plan. When the community incorporated in the early 1980s, the new city took in the Los Angeles County portion. The Ventura County portion had already been annexed into Thousand Oaks.
The postal service, meanwhile, kept assigning “Westlake Village” as a mailing address on both sides, because mail routes follow post offices rather than city limits. So the name stuck to an area considerably larger than the city.
The boundary itself is the part that catches people out. It is not a street. It runs diagonally — roughly from just northeast of Lindero Canyon Road near Blackbird Avenue on the north, down toward South Westlake Boulevard — which means it slices through the middle of the community rather than around it. Two homes on the same street, sometimes two homes next door to each other, can be in different counties.
What actually changes when you cross the line
Your city
On the LA County side you are a resident of the City of Westlake Village — a small city with its own council, its own committees, its own capital projects and its own permitting. On the Ventura County side you are a resident of the City of Thousand Oaks, a much larger city with a different budget, different processes and different priorities. Planning approvals, code enforcement, tree ordinances and permit timelines all differ.
Your school district
This is the big one for families. The Los Angeles County side of Westlake Village is served by Las Virgenes Unified School District — the same district as Agoura Hills, Calabasas, Hidden Hills and Bell Canyon. The Ventura County side is served by Conejo Valley Unified School District, the same district as Thousand Oaks and Newbury Park.
Two consequences. First, a “Westlake Village” listing tells you nothing about the schools — you have to check the address. Second, district boundaries and city boundaries are not identical, so even knowing the county is not always enough. Confirm the specific attendance boundary in writing with the district before you make a housing decision around it. Not with a listing description, not with a school-rating website. I have seen this go wrong for real families.
Your public safety agencies
LA County side: Los Angeles County Fire Department and the Los Angeles County Sheriff’s Department out of the Lost Hills station. Ventura County side: Ventura County Fire and the Thousand Oaks police services provided by the Ventura County Sheriff. This shows up in response areas, in brush-clearance enforcement, and in the fire hazard severity zone mapping that insurers look at.
Your county services
Property tax administration, assessor’s office, recorder, voter registration, county elections, animal control, public health and superior court all follow the county. If you are used to dealing with Ventura County offices in Camarillo and you move a mile east, you are now dealing with Los Angeles County. Tax rates are set by a mix of the statewide base plus local voter-approved measures and district assessments, so they can differ across the line as well — which is why you check the actual tax bill for the actual parcel rather than assuming.
Water and other districts
Westlake Village’s water system is owned and operated by the Las Virgenes Municipal Water District, which sets all rates and policies for water service in the city. Special district boundaries are their own map again, and they do not necessarily follow either the city or the county line.
How to figure out which side a specific home is on
- Look at the parcel number. LA County APNs and Ventura County APNs are formatted differently, and the assessor’s record will tell you the jurisdiction outright.
- Check the actual tax bill for the property, not a national website’s estimate. It names the taxing agencies and any special assessments.
- Confirm the school attendance area with the district directly. Both LVUSD and CVUSD will confirm an address.
- Ask which city issues permits for the property. That single question resolves most confusion.
Any competent local agent should do all four of these for you without being asked. If you are working with someone from outside the area, they very often do not know the line exists.
Frequently asked questions
Is Westlake Village in Los Angeles County or Ventura County?
The incorporated City of Westlake Village is in Los Angeles County. However, a substantial area with a Westlake Village mailing address lies in Ventura County within the City of Thousand Oaks. The county line runs diagonally through the community.
What school district serves Westlake Village?
Both, depending on the address. Las Virgenes Unified serves the Los Angeles County side; Conejo Valley Unified serves the Ventura County side. A Westlake Village address alone does not determine the district.
Are the ZIP codes 91361 and 91362 different counties?
ZIP codes do not reliably map to city or county boundaries here — they were drawn for mail delivery, not jurisdiction. Do not use a ZIP code to determine county, city or school district. Use the parcel record.
Why does this matter when buying a home?
Because it determines your school district, your permitting city, your fire and law enforcement agencies, your county services, your voter registration, and the taxing agencies on your bill — all of which can differ between two homes a few minutes apart.
Which city do Ventura County “Westlake Village” residents actually live in?
The City of Thousand Oaks.
If you are looking at a home in Westlake Village, I will tell you which side of the line it is on, which district it feeds, and who issues its permits before you write an offer. Ask me.
More: Westlake Village area guide · Which school district am I actually in? · Thousand Oaks
