Ventura County, CA zoning map, flood zone and property lines by address
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Towns in Ventura County: Oxnard, Thousand Oaks, Simi Valley.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's countywide study for Ventura County has 249 FIRM panels, the newest effective April 2024; coastal V zones, where waves add to the flood, are mapped along its shore.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Ventura house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the California county parcel layers (each county publishes its own), so a Ventura lot shows the same lines the county assessor draws. Ventura County covers about 1,178,099 acres of land and 234,099 acres of water.
Mapped lines are approximate. The Ventura County assessor keeps the parcel record (Ventura County website); a licensed surveyor sets the true corners.
Zoning
Ventura County zones its unincorporated land, and Oxnard, Thousand Oaks, Simi Valley each zone the land inside their limits. ParcelSheet shows the use the county assessor lists for the lot and links the county planning department for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under California's Planning and Zoning Law (Government Code Title 7, Division 1, starting at section 65000), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Ventura lot can add one depends on its district; the county planning department has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Setbacks
Setbacks in Ventura County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county zoning office gives them for the lot's district, and Oxnard, Thousand Oaks, Simi Valley for land inside their limits.
Hazards that apply
- Storm surge. Ventura County has coastal V zones on its FEMA map, so storm surge reaches its shore. The county's evacuation zones are on its emergency management site; ParcelSheet shows the FEMA zone and the 3 ft sea level rise map at the lot.
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Ventura lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Ventura County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's countywide flood map for Ventura County has 249 panels, the newest effective April 2024. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Ventura County?
Open the California map, type the address, and the parcel outline from the Ventura County assessor shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Ventura County?
Zoning in Ventura County is set by the county for unincorporated land and by each city (such as Oxnard, Thousand Oaks) inside its own limits. ParcelSheet shows the use code the county assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Ventura County?
Under California's Planning and Zoning Law (Government Code Title 7, Division 1, starting at section 65000), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Ventura County ask the zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
What can I build on 5 acres in Ventura County?
Zoning in Ventura County is set by the county for unincorporated land and each city inside its own limits (such as Oxnard, Thousand Oaks). The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the planning office has the district and its rules. See the Ventura County website.
What are the residential setbacks in Ventura County (2026)?
Setbacks in Ventura County come from the zoning code of the county, or of the city when the lot is inside city limits: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the zoning office gives them for the district. See the Ventura County website.
Next to Ventura County: Kern County, Los Angeles County, Santa Barbara County.
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