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County · code 06113

Yolo CountyCalifornia

Yolo County is a county in California, with its seat in Woodland, formed on February 18, 1850.

  • Founded1850
  • County seatWoodland
  • Land area1,015 sq mi + 8.8 sq mi water
  • Population216,403 2020 Census
  • Parcels mapped66,143 checked 14 October 2026
Open the free map Click any parcel in Yolo County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

SutterSolanoNapaColusaSacramentoLake Woodland Census outline · seat marked

Where it is

Yolo 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 CountyVentura CountyYuba CountyYolo County Yolo
Counties of California · Yolo highlighted

History

Formed in 1850 from Yola County

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

Yolo County was originally named Yola in the act that created it from non-county area in 1850; the current spelling came into use by April 1850. The county underwent several boundary changes over its first decades, losing territory to Colusa County in 1851 and 1856, gaining from Solano County in 1857, and losing to Lake County in 1868 and Sacramento County in 1870.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1850
    Yolo County created Yolo created from non-county area. County was named "Yola" in this act; by April 1850 the current spelling was in use.
    from Yola
    · Calif. Stats. 1849, 1st sess., ch. 15, sec. 14/p. 61
  2. 1851
    Lost territory Yolo lost to Colusi (now Colusa).
    to Colusito Colusa
    · Calif. Stats. 1851, 2d sess., ch. 14, sec. 28/p. 179
  3. 1856
    Lost territory Yolo lost to Colusi (now Colusa).
    to Colusito Colusa
    · Calif. Stats. 1856, 7th sess., ch. 105/p. 124
  4. 1857
    Gained territory Yolo gained from Solano.
    from Solano
    · Calif. Stats. 1857, 8th sess., ch. 104/p. 108
  5. 1868
    Lost territory Yolo lost to Lake.
    to Lake
    · Calif. Stats. 1867, 17th sess., ch. 257/p. 269
Show all 10 changes (5 more, mostly small adjustments)
  1. 1850
    Yolo County created Yolo created from non-county area. County was named "Yola" in this act; by April 1850 the current spelling was in use.
    from Yola
    · Calif. Stats. 1849, 1st sess., ch. 15, sec. 14/p. 61
  2. 1850
    Boundary clarified Yolo boundaries clarified (no change).
    no change
    · Calif. Stats. 1849, 1st sess., ch. 61, sec. 5/p. 156
  3. 1851
    Lost territory Yolo lost to Colusi (now Colusa).
    to Colusito Colusa
    · Calif. Stats. 1851, 2d sess., ch. 14, sec. 28/p. 179
  4. 1856
    Lost territory Yolo lost to Colusi (now Colusa).
    to Colusito Colusa
    · Calif. Stats. 1856, 7th sess., ch. 105/p. 124
  5. 1857
    Gained territory Yolo gained from Solano.
    from Solano
    · Calif. Stats. 1857, 8th sess., ch. 104/p. 108
  6. 1866
    Boundary clarified Yolo boundaries clarified (no change).
    no change
    · Calif. Stats. 1865, 16th sess., ch. 181/p. 162; "Waters v. Pool," in Calif. Rpts., 130:136-139
  7. 1868
    Lost territory Yolo lost to Lake.
    to Lake
    · Calif. Stats. 1867, 17th sess., ch. 257/p. 269
  8. 1870
    Lost territory Yolo lost small area to Sacramento.
    to Sacramento
    · Calif. Stats. 1869, 18th sess., ch. 191/p. 294
  9. 1980
    Gained territory Yolo gained small area from Solano. Ordinance passed 20 November 1979; effective 1 January 1980.
    from Solano
    · Minutes of the Board of Supervisors, Solano County, 20 November 1979, ordinance 1085; Minutes of the Board of Supervisors, Yolo County, 20 November 1979, ordinance 861
  10. 1992
    Gained territory Yolo gained small area from Solano.
    from Solano
    · Minutes of the Board of Supervisors, Solano County, 8 December 1992, ordinance 1460; Minutes of the Board of Supervisors, Yolo County, 24 November 1992, ordinance 1153

Land and parcels

What the maps cover in Yolo

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

Yolo by the Census

Population
216,403 2020 Census count
Housing units
80,188 2020 Census count
Land area
1,015 square miles
Water area
8.8 square miles
People per sq mi
213 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

Yolo 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 Yolo County

When was Yolo County founded?
Yolo County was founded in 1850, formed from Yola County.
What is the county seat of Yolo County?
The county seat of Yolo County is Woodland.
Is there an online parcel map for Yolo County?
Yes. Yolo County publishes a parcel map of 66,143 parcels, rated official here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Yolo County's boundary or name changed?
Yolo County was created in 1850 from Yola County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Solano County, Colusa County and Colusi County.
Is my lot in a flood zone?
We do not have flood maps for Yolo 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