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Yolo County, California
County of Yolo
UC Davis Mondavi Center.jpg
Smaller canada-geese-and-skyline.jpg
Images, from top down, left to right: The former Yolo County Courthouse in Woodland, The Ziggurat in West Sacramento, Mondavi Center on the UC Davis campus, Downtown Winters, Canada Geese at the Yolo Bypass Wildlife Area
Flag of Yolo County, California
Official seal of Yolo County, California
Location in the state of California
Location in the state of California
Coordinates: 38°33′14″N 121°44′17″W / 38.55389°N 121.73806°W / 38.55389; -121.73806Coordinates: 38°33′14″N 121°44′17″W / 38.55389°N 121.73806°W / 38.55389; -121.73806
Country United States
State California
Region Sacramento Valley
CSA Greater Sacramento
Incorporated February 18, 1850
County seat Woodland
Largest city Davis (population)
West Sacramento (area)
 • Total 1,024 sq mi (2,650 km2)
 • Land 1,015 sq mi (2,630 km2)
 • Water 8.9 sq mi (23 km2)
Highest elevation
3,123 ft (952 m)
 • Total 200,849
 • Estimate 
 • Density 196.14/sq mi (75.73/km2)
Time zone UTC-8 (Pacific Time Zone)
 • Summer (DST) UTC-7 (Pacific Daylight Time)
Area codes 530, 916, 279
FIPS code 06-113
GNIS feature ID 277321

Yolo County (Wintun: Yo-loy), officially the County of Yolo, is a county located in the northern portion of the U.S. state of California. As of the 2010 census, the population was 200,849. Its county seat is Woodland.

Yolo County is included in the Greater Sacramento metropolitan area and is located in the Sacramento Valley.

The majority of Yolo County remains a relatively rural agricultural region.


In the original act of 1850 the name was spelled "Yola." Yolo is a Native American name variously believed to be a corruption of a tribal name Yo-loy meaning "a place abounding in rushes" or of the name of the chief, Yodo, or of the village of Yodoi.


Yolo County was one of the original counties of California, created in 1850 at the time of statehood.


Aerial view of Watts-Woodland Airport and surrounding area
Aerial view of Watts Woodland Airport and surrounding area

According to the U.S. Census Bureau, the county has a total area of 1,024 square miles (2,650 km2), of which 1,015 square miles (2,630 km2) is land and 8.9 square miles (23 km2) (0.9%) is water.


Major highways

  • I-5 (CA).svg Interstate 5
  • I-80 (CA).svg Interstate 80
  • I-505 (CA).svg Interstate 505
  • California 16.svg State Route 16
  • California 45.svg State Route 45
  • California 84.svg California State Route 84
  • California 113.svg State Route 113
  • California 128.svg State Route 128

County roads

Transportation in Yolo County is based on a system of numbered county roads. The numbering system works in the following way:

  1. North–south roads have numbers from 41 to 117 and increase from west to east.
  2. East–west roads have numbers from 1 to 38A, and then from 151 to 161, and increase from north to south.

Each integer road number is generally one mile (1.6 km) apart, with letters designating occasional roads less than one mile (1.6 km) apart. County roads entering urban areas generally are named once they cross the city boundary. Some examples include County Road 101 in Woodland being renamed Pioneer Ave and County Road 102 (also known as County Route E8) in Davis being named Pole Line Road.

Public transportation

  • Yolobus (Yolo County Transportation District) runs buses throughout Yolo County and into Sacramento, and Sacramento International Airport.
  • The University of California, Davis and the city of Davis jointly run Unitrans, a combination local city bus and campus shuttle.
  • Fairfield-Suisun Transit Line 30 also stops in Davis on its runs between Fairfield (Solano County) and Sacramento.
  • Amtrak has a station in Davis.


  • Yolo County Airport
  • University Airport
  • Borges-Clarksburg Airport
  • Watts-Woodland Airport


The Port of Sacramento, now known as the Port of West Sacramento, is an inland port in West Sacramento, California, in the Sacramento metropolitan area. It is 79 nautical miles (146 km) northeast of San Francisco, and is centered in the California Central Valley, one of the richest agricultural regions in the world.



Places by population, race, and income


The 2010 United States Census reported that Yolo County had a population of 200,849. The ethnic makeup of Yolo County was 126,883 (63.2%) White, 5,208 (2.6%) African American, 2,214 (1.1%) Native American, 26,052 (13.0%) Asian, 910 (0.5%) Pacific Islander, 27,882 (13.9%) from other races, and 11,700 (5.8%) from two or more races. Hispanic or Latino of any race were 60,953 persons (30.3%).


Historical population
Census Pop.
1850 1,086
1860 4,716 334.3%
1870 9,899 109.9%
1880 11,772 18.9%
1890 12,684 7.7%
1900 13,618 7.4%
1910 13,926 2.3%
1920 17,105 22.8%
1930 23,644 38.2%
1940 27,243 15.2%
1950 40,640 49.2%
1960 65,727 61.7%
1970 91,788 39.7%
1980 113,374 23.5%
1990 141,092 24.4%
2000 168,660 19.5%
2010 200,849 19.1%
2019 (est.) 220,500 9.8%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010–2015

As of the census of 2000, there were 168,660 people, 59,375 households, and 37,465 families residing in the county. The population density was 166 people per square mile (64/km2). There were 61,587 housing units at an average density of 61 per square mile (23/km2). The ethnic makeup of the county was 67.7% White, 2.0% Black or African American, 1.2% Native American, 9.9% Asian, 0.3% Pacific Islander, 13.8% from other races, and 5.2% from two or more races. 25.9% of the population were Hispanic or Latino of any race. 10.0% were of German, 6.6% English and 6.4% Irish ancestry according to Census 2000. 68.5% spoke English, 19.5% Spanish, 2.1% Chinese or Mandarin and 1.8% Russian as their first language.

There were 59,375 households, out of which 33.6% had children under the age of 18 living with them, 47.6% were married couples living together, 11.1% had a female householder with no husband present, and 36.9% were non-families. 23.3% of all households were made up of individuals, and 7.3% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.25.

In the county, the population was spread out, with 25.2% under the age of 18, 18.3% from 18 to 24, 28.2% from 25 to 44, 18.9% from 45 to 64, and 9.4% who were 65 years of age or older. The median age was 30 years. For every 100 females, there were 95.6 males. For every 100 females age 18 and over, there were 92.2 males.

The median income for a household in the county was $40,769, and the median income for a family was $51,623. Males had a median income of $38,022 versus $30,687 for females. The per capita income for the county was $19,365. About 9.5% of families and 18.4% of the population were below the poverty line, including 16.0% of those under age 18 and 7.4% of those age 65 or over.


Water Tower, UC Davis(cropped)
Water tower at University of California, Davis


Census-designated places

Other unincorporated communities

Population ranking

The population ranking of the following table is based on the 2010 census of Yolo County.

county seat

Rank City/Town/etc. Municipal type Population (2010 Census)
1 Davis City 65,622
2 Woodland City 55,468
3 West Sacramento City 48,744
4 Winters City 6,624
5 University of California Davis CDP 5,786
6 Esparto CDP 3,108
7 Monument Hills CDP 1,542
8 Dunnigan CDP 1,416
9 Knights Landing CDP 995
10 Madison CDP 503
11 Yolo CDP 450
12 Clarksburg CDP 418
13 Guinda CDP 254
14 Rumsey Indian Rancheria AIAN 77


Public schools

The county's public schools are managed by the Yolo County Office of Education.

Colleges and universities

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