Stanislaus County ( ; ) is a county located in the San Joaquin Valley of the U.S. state of California. As of 2025, its estimated population is 557,719. The county seat is Modesto.

Stanislaus County makes up the Modesto metropolitan statistical area. The county is located just east of the San Francisco Bay Area and serves as a bedroom community for those who work in the eastern part of the Bay Area.

History

The first European to see the area was Gabriel Moraga in 1806.

The county was named after the Estanislao River, which in turn was named for Estanislao, a mission-educated renegade Indian chief who led a band of local Indians in a series of raids, and then battles against Mexican troops until finally being defeated by General Mariano Vallejo in 1826. Estanislao was his baptismal name, the Spanish name version after Saint Stanislaus the Martyr.

Between 1843 and 1846, when California was a province of independent Mexico, five Mexican land grants totaling were granted in Stanislaus County. Rancho Orestimba y Las Garzas, Rancho Pescadero and Rancho Del Puerto were located on the west side of the San Joaquin River, and Rancho Del Rio Estanislao and Rancho Thompson were on the north side of the Stanislaus River. Additionally in 1844, Salomon Pico received a Mexican land grant of in the San Joaquin Valley, somewhere near the Stanislaus River and the San Joaquin River in what is now Stanislaus County. However, the grant was never confirmed by the land commission.

Stanislaus County was formed from part of Tuolumne County in 1854. The county seat was first situated at Adamsville, then moved to Empire in November, La Grange in December, and Knights Ferry in 1862, and was ultimately fixed at the present location in Modesto in 1871.

As the price of housing has increased in the San Francisco Bay Area, many people who work in the southern reaches of the Bay Area have opted for the longer commute and moved to Stanislaus County for the relatively affordable housing.

Geography

According to the U.S. Census Bureau, the county has a total area of , of which (1.3%) are covered by water.

Stanislaus County has historically been divided socially and economically by the north-flowing San Joaquin River, which provided a natural barrier to trade and travel for much of the county's history. Isolated from the main rail corridors through the county and the irrigation projects that generated much of the region's economic prosperity, the part of Stanislaus County west of the river (known to locals as the "West Side" of the county) has largely remained rural and economically dependent on agricultural activities. Because of its proximity to Interstate 5 and the California Aqueduct, some towns within this area, including Patterson and Newman, have experienced tremendous growth and are being transformed into bedroom communities for commuters from the nearby San Francisco Bay Area, while others (including Westley and Crows Landing) have been almost entirely overlooked by development and remain tiny farming communities.

Flora and fauna

A number of rare and endangered species are found in Stanislaus County. The beaked clarkia, (Clarkia rostrata), is listed as a candidate for the federal endangered species list. It has only been found in blue oak-gray pine associations in the foothills of the Sierra Nevada, a habitat that occurs at moderately high elevations. Colusa grass, (Neostapfsia colusana) is listed as endangered by the state. It is restricted to vernal pools.

National protected area

  • San Joaquin River National Wildlife Refuge (part)

Transportation

Major highways

  • 25px Interstate 5
  • 25px State Route 4
  • 25px State Route 33
  • 25px State Route 99
  • 25px State Route 108
  • 25px State Route 120
  • 25px State Route 132
  • 25px State Route 165
  • 25px State Route 219

Public transportation

  • Stanislaus Regional Transit Authority <!-- (StanRTA) --> operates local bus service and paratransit in Modesto, regional service in Stanislaus County, and commuter service connecting to Bay Area Rapid Transit and Altamont Corridor Express.
  • The cities of Ceres, Oakdale, Riverbank, and Turlock run small local bus systems.
  • Both Greyhound and Amtrak have stops in Modesto and Turlock. Amtrak for Turlock actually stops in Denair.

Airports

Modesto City-County Airport has previously had a number of scheduled passenger flights. Currently, its main air traffic is general aviation. Other (general aviation) airports around the county include Oakdale Airport, Patterson Airport, and Turlock Airpark.

Demographics

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In the United States House of Representatives, Stanislaus County is split between , , and .

In the California State Senate, Stanislaus is represented by:

  • the 4th Senate District, represented by Republican Marie Alvarado-Gil.

In the California State Assembly, Stanislaus is split between the 22nd Assembly District, represented by Republican Juan Alanis, and the 9th Assembly District, represented by Republican Heath Flora.

Economy

Agriculture is Stanislaus County's number one industry, with almonds being the primary agricultural product.

Education

Tertiary

The California State University, Stanislaus is a campus of the California State University located in Turlock.

The Yosemite Community College District covers a 4,500-sq-mi area and serves a population over 550,000, encompassing all of two counties (Stanislaus and Tuolumne) and parts of four others (Calaveras, Merced, San Joaquin, and Santa Clara). It is composed of two colleges: Modesto Junior College in Modesto and Columbia College in Sonora in Tuolumne County to the northeast.

Kaplan College has a campus in Modesto, ITT Technical Institute has campus in Lathrop in San Joaquin County to the northeast, and San Joaquin Valley College has campus in Modesto.

K-12 education

School districts include:

Unified:

  • Ceres Unified School District
  • Denair Unified School District
  • Hughson Unified School District - Serves some areas for PK-12 and some only for 9–12
  • Newman-Crows Landing Unified School District
  • Oakdale Joint Unified School District - Serves some areas for PK-12 and some only for 9–12
  • Patterson Joint Unified School District
  • Riverbank Unified School District
  • Turlock Unified School District - Serves some areas for PK-12 and some only for 9–12
  • Waterford Unified School District

Secondary:

  • Modesto City High School District

Elementary:

  • Chatom Union Elementary School District
  • Empire Union Elementary School District
  • Gratton Elementary School District
  • Hart-Ransom Union Elementary School District
  • Hickman Community Charter School District
  • Keyes Union Elementary School District
  • Knights Ferry Elementary School District
  • Modesto City Elementary School District
  • Paradise Elementary School District
  • Roberts Ferry Union Elementary School District
  • Salida Union Elementary School District
  • Shiloh Elementary School District
  • Stanislaus Union Elementary School District
  • Sylvan Union Elementary School District
  • Valley Home Joint Elementary School District

Media

Stanislaus County is in the Sacramento television market, thus receives Sacramento media.

The county also has media outlets that serve the local community:

  • The Modesto Press is the local online news site for Modesto and the surrounding areas of the Central Valley.
  • The Modesto Bee is a Modesto-based daily newspaper.

Communities

Incorporated cities

  • Ceres
  • Hughson
  • Modesto
  • Newman
  • Oakdale
  • Patterson
  • Riverbank
  • Turlock
  • Waterford

Census-designated places

  • Airport
  • Bret Harte
  • Bystrom
  • Cowan
  • Crows Landing
  • Del Rio
  • Denair
  • Diablo Grande
  • East Oakdale
  • Empire
  • Grayson
  • Hickman
  • Keyes
  • Knights Ferry
  • La Grange
  • Monterey Park Tract
  • Orange Blossom
  • Parklawn
  • Riverdale Park
  • Rouse
  • Salida
  • Shackelford (former)
  • Valley Home
  • West Modesto
  • Westley

Other unincorporated communities

  • Hills Ferry
  • Langworth
  • McHenry
  • Montpelier
  • Mountain View
  • Oso
  • Roberts Ferry
  • Timba (or Orestimba)
  • Tuolumne
  • Wood Colony
  • Eugene

Population ranking

The population ranking of the following table is based on the 2020 census of Stanislaus County.

† county seat

{| class="wikitable sortable"

|-

!Rank

!City/Town/etc.

!Municipal type

!Population (2020 census)

|- style="background:#fffacd;"

| 1

|† Modesto

| City

| 218,464

|- style="background:#fffacd;"

| 2

|Turlock

| City

| 72,740

|- style="background:#fffacd;"

| 3

|Ceres

| City

| 49,302

|- style="background:#fffacd;"

| 4

|Riverbank

| City

| 24,865

|- style="background:#fffacd;"

| 5

|Patterson

| City

| 23,781

|- style="background:#fffacd;"

| 6

|Oakdale

| City

| 23,181

|- style="background:honeyDew;"

| 7

|Salida

| CDP

| 13,886

|- style="background:#fffacd;"

| 8

|Newman

| City

| 12,351

|- style="background:#fffacd;"

| 9

|Waterford

| City

| 9,120

|- style="background:#fffacd;"

| 10

|Hughson

| City

| 7,481

|- style="background:honeyDew;"

| 11

|West Modesto

| CDP

| 5,965

|- style="background:honeyDew;"

| 12

|Keyes

| CDP

| 5,672

|- style="background:honeyDew;"

| 13

|Bret Harte

| CDP

| 5,135

|- style="background:honeyDew;"

| 14

|Denair

| CDP

| 4,865

|- style="background:honeyDew;"

| 15

|Empire

| CDP

| 4,202

|- style="background:honeyDew;"

| 16

|Bystrom

| CDP

| 3,957

|- style="background:honeyDew;"

| 17

|East Oakdale

| CDP

| 3,201

|- style="background:honeyDew;"

| 18

|Rouse

| CDP

| 1,913

|- style="background:honeyDew;"

| 19

|Diablo Grande

| CDP

| 1,669

|- style="background:honeyDew;"

| 20

|Del Rio

| CDP

| 1,399

|- style="background:honeyDew;"

| 21

|Airport

| CDP

| 1,389

|- style="background:honeyDew;"

| 22

|Parklawn

| CDP

| 1,249

|- style="background:honeyDew;"

| 23

|Orange Blossom

| CDP

| 1,068

|- style="background:honeyDew;"

| 24

|Riverdale Park

| CDP

| 1,053

|- style="background:honeyDew;"

| 25

|Grayson

| CDP

| 1,041

|- style="background:honeyDew;"

| 26

|Hickman

| CDP

| 604

|- style="background:honeyDew;"

| 27

|Westley

| CDP

| 575

|- style="background:honeyDew;"

| 28

|Cowan

| CDP

| 342

|- style="background:honeyDew;"

| 29

|Crows Landing

| CDP

| 322

|- style="background:honeyDew;"

| 30

|Valley Home

| CDP

| 284

|- style="background:honeyDew;"

| 31

|Monterey Park Tract

| CDP

| 164

|- style="background:honeyDew;"

| 32

|La Grange

| CDP

| 166

|- style="background:honeyDew;"

| 33

|Knights Ferry

| CDP

| 112

|}

See also

  • List of museums in the San Joaquin Valley
  • List of school districts in Stanislaus County, California
  • National Register of Historic Places listings in Stanislaus County, California

Notes

References

Further reading

  • John T. Bramhall, The Story of Stanislaus. Modesto, CA: Modesto Herald, 1914.
  • Sol P. Elias, Stories of Stanislaus: A Collection of Stories on the History and Achievement of Stanislaus County. Modesto, CA: Sol P. Elias, 1924.
  • A Memorial and Biographical History of the Counties of Merced, Stanislaus, Calaveras, Tuolumne and Mariposa, California. Chicago: Lewis Publishing Co., 1892.
  • Keith Highiet and David Seymour, "StaniStory: Change and Continuity in Stanislaus County (2nd Edition)." McHenry Museum & Historical Society, publisher, 2025.
  • Connecting Stanislaus
  • Visit Stanislaus
  • Stanislaus County Fair
  • California State University Stanislaus
  • Modesto Junior College
  • Stanislaus PRIDE Center
  • Stanislaus County Farm Bureau
  • Stanislaus County Free Library
  • Stanislaus County Law Library