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County · code 06111

Ventura CountyCalifornia

Ventura County is a county in California with its seat in Ventura. It was formed in 1873 from San Luis Obispo and Santa Barbara counties.

  • Founded1873
  • County seatVentura
  • Named forMission San Buenaventura, California
  • Land area1,841 sq mi + 366 sq mi water
  • Population843,843 2020 Census
  • Parcels mapped268,149 checked 16 October 2026
Open the free map Click any parcel in Ventura County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Los AngelesSanta BarbaraKern Ventura Census outline · seat marked

Where it is

Ventura on the map of California

California has 58 counties and county equivalents, each with its own records office. Shapes with a page are links.

Alameda CountyAlpine CountyAmador CountyButte CountyCalaveras CountyColusa CountyContra Costa CountyDel Norte CountyEl Dorado CountyFresno CountyGlenn CountyHumboldt CountyImperial CountyInyo CountyKern CountyKings CountyLake CountyLassen CountyLos Angeles CountyMadera CountyMarin CountyMariposa CountyMendocino CountyMerced CountyModoc CountyMono CountyMonterey CountyNapa CountyNevada CountyOrange CountyPlacer CountyPlumas CountyRiverside CountySacramento CountySan Benito CountySan Bernardino CountySan Diego CountySan Francisco CountySan Joaquin CountySan Luis Obispo CountySan Mateo CountySanta Barbara CountySanta Clara CountySanta Cruz CountyShasta CountySierra CountySiskiyou CountySolano CountySonoma CountyStanislaus CountySutter CountyTehama CountyTrinity CountyTulare CountyTuolumne CountyYolo CountyYuba CountyVentura County Ventura
Counties of California · Ventura highlighted

History

Formed in 1873 from San Luis Obispo County and Santa Barbara County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Ventura County was created from San Luis Obispo and Santa Barbara on 1 January 1873, under an act passed 22 March 1872. In July 1881, it gained territory from Los Angeles County following an official boundary survey. The county lost territory to Kern County in 1919 when boundaries were adjusted to run on public land survey lines, with additional small areas lost to Kern in 1986 and 1991.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1873
    Ventura County created Ventura created from San Luis Obispo and Santa Barbara. Act passed 22 March 1872; took effect 1 January 1873.
    from San Luis Obispofrom Santa Barbara
    · Calif. Stats. 1871, 19th sess., ch. 351/pp. 484-489; Political Code 1872, 1: secs. 3946-3947/pp. 142-143
  2. c. 1881
    Gained territory Ventura gained from Los Angeles as a result of an official boundary survey.
    from Los Angeles
    · Coy, 150-154, 292
  3. 1919
    Lost territory Ventura lost to Kern when boundary was adjusted to run on public land survey lines; legislature authorized Ventura to exchange with Los Angeles. The California Supreme Court declared this chapter of the 1919 Political Code unconstitutional on 19 February 1920, but the Ventura/Kern change appears to have remained in effect; change confirmed in 1923 by reenactment of the 1919 law.
    to Kernto Los Angeles
    · Calif. Stats. 1919, 43d sess., ch. 470, secs. 3923, 3964/pp. 870, 908-909; "Mundell v. Lyons," in Calif. Rpts., 182:289-293; Calif. Laws 1923, 45th sess., ch. 160, secs. 16, 57/pp. 336, 373
  4. 1923
    Boundary clarified Ventura boundaries redefined; see 23 July 1919 (no change).
    no change
    · Calif. Laws 1923, 45th sess., ch. 160, secs. 16, 57/pp. 336, 373
  5. 1986
    Lost territory Ventura lost small area to Kern.
    to Kern
    · Minutes of the Board of Supervisors, Kern County, 4 November 1986, ordinance G-4345
  6. 1991
    Lost territory Ventura lost to Kern.
    to Kern
    · Calif. Stats. 1991-1992, reg. sess., ch. 51/p. 150

Land and parcels

What the maps cover in Ventura

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Ventura by the Census

Population
843,843 2020 Census count
Housing units
293,080 2020 Census count
Land area
1,841 square miles
Water area
366 square miles
People per sq mi
458 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Ventura County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

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Questions

Common questions about Ventura County

When was Ventura County founded?
Ventura County was founded in 1873, formed from San Luis Obispo County and Santa Barbara County, and named after Mission San Buenaventura, California.
What is the county seat of Ventura County?
The county seat of Ventura County is Ventura.
Is there an online parcel map for Ventura County?
Yes. Ventura County publishes a parcel map of 268,149 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Ventura County's boundary or name changed?
Ventura County was created in 1873 from San Luis Obispo County and Santa Barbara County. Since then the Atlas of Historical County Boundaries records 4 later changes, most of them small boundary adjustments, chiefly involving Kern County and Los Angeles County.
Is my lot in a flood zone?
We do not have flood maps for Ventura County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door