Monterey County area

Population and density of Monterey County

The Census Bureau estimates that 433,729 people lived in Monterey County on July 1, 2025. That ranks #175 of 3,222 county equivalents nationally and #22 of 58 in California. Since the April 1, 2020 estimates base of 441,022, the population has declined by 7,293 (−1.7%), compared with −0.5% for California as a whole.

With 3,281.7 square miles of land, that is 132 people per square mile (51 per km²), placing Monterey County #832 nationally for density and #26 in California. The median county equivalent has 47 people per square mile; the California median is 112. Put another way, there are about 4.8 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 Monterey County

12 incorporated places lie at least partly in Monterey County. Together they are home to 332,412 people (76.6%); the other 101,317 (23.4%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Salinas city, with 159,134 residents in the county. Among places with at least 1,000 residents in 2020, Greenfield city grew fastest since then (+11.5%).

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

Metropolitan area

Monterey County is a central county of the Salinas, CA Metropolitan Statistical Area. Monterey County is the area’s only county equivalent, so the metro area has the same 3,281.7 square miles of land. By combined land it ranks #92 of 393 metropolitan areas, and #129 by population.

ZIP codes

33 ZIP Code Tabulation Areas have land in Monterey County; 31 of them have most of their land inside the county, and the others mainly cover neighboring areas.

932109342693450934519390193905939069390793908939209392193923939249392593926939279392893930939329393393940939439394493950939539395493955939609396295004950129503995076

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 Monterey County

Monterey County shares a land border with 5 county equivalents. It has more land than 3 of them. The largest neighbor is Fresno County (5,958.6 mi²) and the smallest is Santa Cruz County (445.1 mi²). Together with its neighbors, Monterey County forms a block of 15,765.9 mi² of land, of which it holds 20.8%.

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

Monterey County has more land than 2 of the 50 states. It is about 1.7 times the land area of Delaware (1,948.6 mi²), while Connecticut, the next larger state, has 1.5 times as much land (4,842.5 mi²). California’s county land could hold about 47 areas the size of Monterey County.

Another way to picture it: the same land area would fill a square about 57.3 miles (92.2 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 Monterey County?

Monterey County has more land than 3,066 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 Monterey County at #143 nationally by total area, 13 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 13%, compared with a national county-equivalent median of 1.2% — 11.8 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 Monterey 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.