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County · code 06059

Orange CountyCalifornia

Orange County is a California county with its seat in Santa Ana, formed in 1889.

  • Founded1889
  • County seatSanta Ana
  • Named fororange
  • Land area793 sq mi + 157 sq mi water
  • Population3,186,989 2020 Census
  • Parcels mapped702,987 checked 14 October 2026
Open the free map Click any parcel in Orange County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Los AngelesSan DiegoRiversideSan Bernardino Santa Ana Census outline · seat marked

Where it is

Orange 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 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 CountyVentura CountyYolo CountyYuba CountyOrange County Orange
Counties of California · Orange highlighted

History

Formed in 1889 from Los Angeles County

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

Orange County was created from Los Angeles County on June 4, 1889. The county was named after the orange fruit. Since its creation, Orange County has made small boundary adjustments with Los Angeles and Riverside Counties through 1999.

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

  1. 1889
    Orange County created Orange created from Los Angeles. Act passed 11 March 1889; referendum for or against creation of new county held 4 June 1889.
    from Los Angeles
    · Calif. Stats. 1889, 28th sess., ch. 110/pp. 123-129
  2. 1987
    Gained territory Orange gained small area in Cypress Memorial Park Cemetery from Los Angeles. Ordinance passed 29 July 1987; effective 1 September 1987.
    from Los Angeles
    · Minutes of the Board of Supervisors, Orange County, 29 July 1987, ordinance 3647
  3. 1988
    Exchanged territory Orange exchanged small areas with Riverside. Ordinance passed 27 September 1988; effective 8 November 1988.
    with Riverside
    · Minutes of the Board of Supervisors, Riverside County, 27 September 1988, ordinance 665
  4. 1992
    Changed Boundary between Orange and Riverside restated (no change). Ordinance passed 26 November 1991; effective 1 July 1992.
    Riverside
    · Minutes of the Board of Supervisors, Riverside County, 26 November 1991, ordinance 717
  5. 1993
    Boundary clarified Orange boundaries redefined (no change).
    no change
    · Calif. Stats. 1993-1994, reg. sess., ch. 1195, sec. 4/pp. 6855-6858
  6. 1999
    Gained territory Orange gained small area from Los Angeles.
    from Los Angeles
    · Minutes of the Board of Supervisors, Los Angeles County, 24 August 1999, ordinance 99-0077M
  7. 2000
    Boundary clarified Boundary between Orange and Los Angeles redefined to incorporate 1999 boundary change (no change).
    with Los Angelesno change
    · Calif. Stats. 2000, reg. sess., ch. 506, secs. 15-16 in Official California Legislative Information, http://www.leginfo.ca.gov/statute.html, 23 September 2002

Land and parcels

What the maps cover in Orange

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

Orange by the Census

Population
3,186,989 2020 Census count
Housing units
1,129,785 2020 Census count
Land area
793 square miles
Water area
157 square miles
People per sq mi
4,020 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

Orange 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

Open Orange County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Orange County

When was Orange County founded?
Orange County was founded in 1889, formed from Los Angeles County, and named after orange.
What is the county seat of Orange County?
The county seat of Orange County is Santa Ana.
Is there an online parcel map for Orange County?
Yes. A public source publishes a parcel map of 702,987 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Orange County's boundary or name changed?
Orange County was created in 1889 from Los Angeles County. Since then the Atlas of Historical County Boundaries records 3 later changes, most of them small boundary adjustments, chiefly involving Los Angeles County and Riverside County.
Is my lot in a flood zone?
We do not have flood maps for Orange 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