Parcel Chartplaces Open the free map

County · code 06077

San Joaquin CountyCalifornia

San Joaquin County is a county in California with its seat in Stockton. It was created on February 18, 1850, and is named after the San Joaquin River.

  • Founded1850
  • County seatStockton
  • Named forSan Joaquin River, California
  • Land area1,392 sq mi + 34 sq mi water
  • Population779,233 2020 Census
  • Parcels mapped217,055 checked 15 October 2026
Open the free map Click any parcel in San Joaquin County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

StanislausSacramentoContra CostaAlamedaCalaverasAmadorSanta Clara Stockton Census outline · seat marked

Where it is

San Joaquin 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 Luis Obispo CountySan Mateo CountySanta Barbara CountySanta Clara CountySanta Cruz CountyShasta CountySierra CountySiskiyou CountySolano CountySonoma CountyStanislaus CountySutter CountyTehama CountyTrinity CountyTulare CountyTuolumne CountyVentura CountyYolo CountyYuba CountySan Joaquin County San Joaquin
Counties of California · San Joaquin highlighted

History

Founded in 1850

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

San Joaquin was created from non-county area on February 18, 1850. In 1852, it gained territory from Contra Costa County, but in 1860 it lost territory to Stanislaus County. Territory was lost to Sacramento County in 1861 and then regained from Sacramento County in 1878.

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

  1. 1850
    San Joaquin County created San Joaquin created from non-county area. · Calif. Stats. 1849, 1st sess., ch. 15, sec. 26/p. 63; Tinkham, 64
  2. 1851
    Boundary clarified San Joaquin boundaries redefined (no change).
    no change
    · Calif. Stats. 1851, 2d sess., ch. 14, sec. 12/p. 175
  3. 1852
    Gained territory San Joaquin gained from Contra Costa.
    from Contra Costa
    · Calif. Stats. 1852, 3d sess., chs. 105-106/pp. 178-180; Purcell, 250
  4. 1860
    Lost territory San Joaquin lost to Stanislaus.
    to Stanislaus
    · Calif. Stats. 1860, 11th sess., ch. 62/pp. 34-35
  5. 1861
    Lost territory San Joaquin lost to Sacramento.
    to Sacramento
    · Calif. Stats. 1861, 12th sess., ch. 219/p. 221; Tinkham, 64-65
  6. 1878
    Gained territory San Joaquin gained from Sacramento.
    from Sacramento
    · Calif. Stats. 1877, 22d sess., Acts Amendatory of the Political Code, ch. 636/p. 70
  7. 1905
    Boundary clarified Boundary between San Joaquin and Sacramento redefined (no change).
    with Sacramentono change
    · Calif. Stats. 1905, 36th sess., ch. 167/p. 164

Land and parcels

What the maps cover in San Joaquin

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

San Joaquin by the Census

Population
779,233 2020 Census count
Housing units
251,453 2020 Census count
Land area
1,392 square miles
Water area
34 square miles
People per sq mi
560 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

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Records

Permits

Zoning and code

County government

See your own lot on these maps

Open San Joaquin 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.

Open the free map no sign-in Pro early access

Questions

Common questions about San Joaquin County

When was San Joaquin County founded?
San Joaquin County was founded in 1850, and named after San Joaquin River, California.
What is the county seat of San Joaquin County?
The county seat of San Joaquin County is Stockton.
Is there an online parcel map for San Joaquin County?
Yes. A public source publishes a parcel map of 217,055 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has San Joaquin County's boundary or name changed?
San Joaquin County was created in 1850. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Sacramento County, Contra Costa County and Stanislaus County.
Who issues building permits in San Joaquin County?
The county's page on building permits: Permits. Inside a city or town, ask that city first.
Is my lot in a flood zone?
We do not have flood maps for San Joaquin 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