County outline
Where Santa Cruz County is located
Area breakdown
Land accounts for 73.3% of Santa Cruz County’s measured area and water for 26.7%. Its combined area converts to 1,572.5 square kilometers or approximately 388,583 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 445.106 | 1,152.819 | 284,867.8 |
| Water | 162.055 | 419.721 | 103,715.2 |
| Total | 607.161 | 1,572.54 | 388,583 |
How Santa Cruz County compares
By original Census land area, Santa Cruz County ranks #57 of 58 in California and #2286 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 0.29 times the California county-equivalent median of 1,535.7 square miles. It accounts for 0.3% of the combined county land area in the state.
See the complete California ranking · What counts as a county equivalent?
Population and density of Santa Cruz County
The Census Bureau estimates that 258,852 people lived in Santa Cruz County on July 1, 2025. That ranks #286 of 3,222 county equivalents nationally and #25 of 58 in California. Since the April 1, 2020 estimates base of 272,163, the population has declined by 13,311 (−4.9%), compared with −0.5% for California as a whole.
With 445.1 square miles of land, that is 582 people per square mile (225 per km²), placing Santa Cruz County #303 nationally for density and #11 in California. The median county equivalent has 47 people per square mile; the California median is 112. Put another way, there are about 1.1 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 271,758 | 261,109 | 265,786 | 263,322 | 261,417 | 258,852 |
| Change | — | −10,649 | +4,677 | −2,464 | −1,905 | −2,565 |
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 Santa Cruz County
4 incorporated places lie at least partly in Santa Cruz County. Together they are home to 133,505 people (51.6%); the other 125,347 (48.4%) live outside any incorporated place, in unincorporated communities and rural areas.
The largest is Santa Cruz city, with 61,797 residents in the county.
| Incorporated place | Population 2025 | Since 2020 | Land mi² |
|---|---|---|---|
| Santa Cruz cityCounty seat | 61,797 | −3.8% | 12.7 |
| Watsonville city | 50,716 | −3.5% | 6.786 |
| Scotts Valley city | 11,652 | −4.7% | 4.618 |
| Capitola city | 9,340 | −6% | 1.594 |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Santa Cruz County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.
Metropolitan area
Santa Cruz County is a central county of the Santa Cruz-Watsonville, CA Metropolitan Statistical Area. Santa Cruz County is the area’s only county equivalent, so the metro area has the same 445.1 square miles of land. By combined land it ranks #368 of 393 metropolitan areas, and #196 by population. It belongs to the San Jose-San Francisco-Oakland, CA Combined Statistical Area.
ZIP codes
17 ZIP Code Tabulation Areas have land in Santa Cruz County, and each lies mostly inside the county.
9500395005950069500795010950179501895019950339504195060950629506495065950669507395076
ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Post-office-box and single-address ZIP Codes have no tabulation area.
Counties bordering Santa Cruz County
Santa Cruz County shares a land border with 4 county equivalents. Each of them has more land than Santa Cruz County. The largest neighbor is Monterey County (3,281.7 mi²) and the smallest is San Mateo County (448.6 mi²). Together with its neighbors, Santa Cruz County forms a block of 6,855.2 mi² of land, of which it holds 6.5%.
| Bordering county equivalent | Land mi² | Size vs. Santa Cruz | Compare |
|---|---|---|---|
| Monterey County | 3,281.7 | 7.4× larger | Compare |
| San Benito County | 1,388.7 | 3.1× larger | Compare |
| Santa Clara County | 1,291.1 | 2.9× larger | Compare |
| San Mateo County | 448.6 | about the same | Compare |
How big is Santa Cruz County compared with U.S. states?
Santa Cruz County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 2.3 times as much. California’s county land could hold about 350 areas the size of Santa Cruz County.
Another way to picture it: the same land area would fill a square about 21.1 miles (34 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 Santa Cruz County?
Santa Cruz County has more land than 936 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 Santa Cruz County at #1,718 nationally by total area, 568 places closer to the top than its land rank. The water assigned to this geography moves it ahead of some county equivalents with more land.
Its water share is 26.7%, compared with a national county-equivalent median of 1.2% — 25.5 percentage points higher. 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 Santa Cruz County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #2285 | Carroll County, Illinois | 445.4 | Compare |
| #2286 | Santa Cruz County, California | 445.1 | This county |
| #2287 | Parke County, Indiana | 444.7 | Compare |
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.
Representative coordinates
The Census internal point is 37.012188, -122.007688. It represents a location inside the geography; it is not necessarily the centroid or the address of a courthouse.
Source and precision
U.S. Census Bureau, 2026 Gazetteer Files, Counties. Original ALAND: 1,152,818,024 m²; AWATER: 419,720,239 m². Rankings use ALAND; exact ties use ascending GEOID. Tables preserve Census-published square miles to three decimals, with conversions based on those values.
Common questions
How big is Santa Cruz County?
Santa Cruz County, California has 445.1 square miles (1,152.8 km²) of land and 162.1 square miles of water, for a total area of 607.2 square miles. It ranks #2286 of 3,222 U.S. county equivalents by land area.
Is Santa Cruz County the largest county in California?
No. Santa Cruz County ranks #57 of 58 in California by land area. The largest is San Bernardino County, with 20,068.4 square miles of land.
What counties border Santa Cruz County?
Santa Cruz County shares a land border with Santa Clara County, San Mateo County, Monterey County, and San Benito County.
What is the population of Santa Cruz County?
The Census Bureau estimates Santa Cruz County had 258,852 residents on July 1, 2025, ranking #286 of 3,222 county equivalents. That is 582 people per square mile of land.
What is the county seat of Santa Cruz County?
The county seat of Santa Cruz County is Santa Cruz.
What cities and towns are in Santa Cruz County?
Santa Cruz County has 4 incorporated places. The most populous are Santa Cruz city, Watsonville city, Scotts Valley city, and Capitola city; 125,347 residents live outside any incorporated place.
Is Santa Cruz County part of a metropolitan area?
Yes. It is a central county of the Santa Cruz-Watsonville, CA Metropolitan Statistical Area.
How many ZIP codes are in Santa Cruz County?
17 ZIP Code Tabulation Areas have land in Santa Cruz County, and 17 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does Santa Cruz County compare with U.S. states?
It has less land than every state. Rhode Island, the smallest, has 2.3 times as much land.
How many acres of land are in Santa Cruz County?
The land measurement converts to approximately 284,868 acres. Including water, total area is approximately 388,583 acres. One square mile equals 640 acres.
Why might another source show a different area?
Check whether it reports land or total area, its Census vintage, and its rounding. Our guide explains how to reconcile county area figures.
Can this establish a property boundary?
No. Statistical measurements and generalized maps do not establish property lines. Consult the relevant local surveying or land-records authority.