Yolo County area

Population and density of Yolo County

The Census Bureau estimates that 224,410 people lived in Yolo County on July 1, 2025. That ranks #322 of 3,222 county equivalents nationally and #27 of 58 in California. Since the April 1, 2020 estimates base of 217,871, the population has grown by 6,539 (+3%), compared with −0.5% for California as a whole.

With 1,013 square miles of land, that is 222 people per square mile (86 per km²), placing Yolo County #608 nationally for density and #19 in California. The median county equivalent has 47 people per square mile; the California median is 112. Put another way, there are about 2.9 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Yolo County

4 incorporated places lie at least partly in Yolo County. Together they are home to 193,053 people (86%); the other 31,357 (14%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Davis city, with 66,110 residents in the county. The county seat, Woodland city, has 62,513 residents. By land, West Sacramento city is the largest at 21.5 mi². Among places with at least 1,000 residents in 2020, Winters city grew fastest since then (+15.6%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Yolo County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Yolo County is an outlying county of the Sacramento-Roseville-Folsom, CA Metropolitan Statistical Area. Its 4 county equivalents have 2,477,274 residents on 5,093.6 square miles of land; Yolo County accounts for 19.9% of the land and 9.1% of the residents. By combined land it ranks #50 of 393 metropolitan areas, and #27 by population. It belongs to the Sacramento-Roseville, CA Combined Statistical Area.

ZIP codes

19 ZIP Code Tabulation Areas have land in Yolo County; 17 of them have most of their land inside the county, and the others mainly cover neighboring areas.

95605956069560795612956169561895620956279563795645956539567995691956949569595697956989577695937

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Yolo County

Yolo County shares a land border with 6 county equivalents. It has more land than 4 of them. The largest neighbor is Lake County (1,255.1 mi²) and the smallest is Sutter County (602.7 mi²). Together with its neighbors, Yolo County forms a block of 6,560.5 mi² of land, of which it holds 15.4%.

How big is Yolo County compared with U.S. states?

Yolo County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1 times as much. California’s county land could hold about 154 areas the size of Yolo County.

Another way to picture it: the same land area would fill a square about 31.8 miles (51.2 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Yolo County?

Yolo County has more land than 2,557 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Yolo County at #747 nationally by total area, 82 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 0.9%, compared with a national county-equivalent median of 1.2% — 0.3 percentage points lower. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Yolo County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.