County outline
Where Cumberland County is located
Area breakdown
Land accounts for 71.3% of Cumberland County’s measured area and water for 28.7%. Its combined area converts to 1,755.6 square kilometers or approximately 433,821 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 483.38 | 1,251.948 | 309,363.2 |
| Water | 194.465 | 503.662 | 124,457.6 |
| Total | 677.845 | 1,755.61 | 433,820.8 |
How Cumberland County compares
By original Census land area, Cumberland County ranks #5 of 21 in New Jersey and #2141 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 1.501 times the New Jersey county-equivalent median of 322 square miles. It accounts for 6.6% of the combined county land area in the state.
See the complete New Jersey ranking · What counts as a county equivalent?
Population and density of Cumberland County
The Census Bureau estimates that 157,148 people lived in Cumberland County on July 1, 2025. That ranks #454 of 3,222 county equivalents nationally and #16 of 21 in New Jersey. Since the April 1, 2020 estimates base of 154,145, the population has grown by 3,003 (+1.9%), compared with +2.8% for New Jersey as a whole.
With 483.4 square miles of land, that is 325 people per square mile (126 per km²), placing Cumberland County #477 nationally for density and #17 in New Jersey. The median county equivalent has 47 people per square mile; the New Jersey median is 1,137. Put another way, there are about 2 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 153,733 | 152,124 | 152,025 | 154,497 | 156,407 | 157,148 |
| Change | — | −1,609 | −99 | +2,472 | +1,910 | +741 |
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 Cumberland County
Cumberland County is divided into 14 municipalities and townships. In New Jersey, county subdivisions are local governments, and together they cover all of the county’s land and residents.
The most populous is Vineland city, with 62,703 residents (39.9% of the county). The largest by land is Maurice River township, at 93.2 mi², or 19.3% of the county’s land. The county seat, Bridgeton city, has 28,307 residents. Among those with at least 1,000 residents in 2020, Upper Deerfield township grew fastest since then (+5.6%).
| County subdivision | Population 2025 | Since 2020 | Land mi² | Share of county land |
|---|---|---|---|---|
| Vineland city | 62,703 | +3.2% | 68.4 | 14.2% |
| Bridgeton cityCounty seat | 28,307 | +4% | 6.228 | 1.3% |
| Millville city | 28,098 | +2.2% | 42 | 8.7% |
| Upper Deerfield township | 8,111 | +5.6% | 31.2 | 6.5% |
| Fairfield township | 5,440 | −1.9% | 41.1 | 8.5% |
| Maurice River township | 4,780 | −23% | 93.2 | 19.3% |
| Commercial township | 4,767 | +2.1% | 31.9 | 6.6% |
| Hopewell township | 4,517 | +2.8% | 29.9 | 6.2% |
| Deerfield township | 3,251 | +3.5% | 16.8 | 3.5% |
| Lawrence township | 3,167 | +2.6% | 36.9 | 7.6% |
| Downe township | 1,416 | +1.1% | 48.4 | 10% |
| Stow Creek township | 1,356 | +3% | 18.3 | 3.8% |
| Greenwich township | 779 | +1.8% | 17.8 | 3.7% |
| Shiloh borough | 456 | +3.2% | 1.203 | 0.2% |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Cumberland County. Land: 2026 Census Gazetteer. How communities are listed.
Metropolitan area
Cumberland County is a central county of the Vineland, NJ Metropolitan Statistical Area. Cumberland County is the area’s only county equivalent, so the metro area has the same 483.4 square miles of land. By combined land it ranks #363 of 393 metropolitan areas, and #283 by population. It belongs to the Philadelphia-Reading-Camden, PA-NJ-DE-MD Combined Statistical Area.
ZIP codes
22 ZIP Code Tabulation Areas have land in Cumberland County; 19 of them have most of their land inside the county, and the others mainly cover neighboring areas.
08270083020831108314083160831808320083210832308324083270832908332083400834408345083480834908352083530836008361
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 Cumberland County
Cumberland County shares a land border with 4 county equivalents. It has more land than 3 of them. The largest neighbor is Atlantic County (555.6 mi²) and the smallest is Cape May County (251.5 mi²). Together with its neighbors, Cumberland County forms a block of 1,944.3 mi² of land, of which it holds 24.9%.
| Bordering county equivalent | Land mi² | Size vs. Cumberland | Compare |
|---|---|---|---|
| Atlantic County | 555.6 | 1.1× larger | Compare |
| Salem County | 331.9 | 1.5× smaller | Compare |
| Gloucester County | 322 | 1.5× smaller | Compare |
| Cape May County | 251.5 | 1.9× smaller | Compare |
How big is Cumberland County compared with U.S. states?
Cumberland County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 2.1 times as much. New Jersey’s county land could hold about 15 areas the size of Cumberland County.
Another way to picture it: the same land area would fill a square about 22 miles (35.4 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 Cumberland County?
Cumberland County has more land than 1,081 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 Cumberland County at #1,501 nationally by total area, 640 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 28.7%, compared with a national county-equivalent median of 1.2% — 27.5 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 Cumberland County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #2140 | Roane County, West Virginia | 483.6 | Compare |
| #2141 | Cumberland County, New Jersey | 483.4 | This county |
| #2142 | Columbia County, Pennsylvania | 483.3 | 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 39.328434, -75.121628. 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: 1,251,948,167 m²; AWATER: 503,663,247 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 Cumberland County?
Cumberland County, New Jersey has 483.4 square miles (1,251.9 km²) of land and 194.5 square miles of water, for a total area of 677.8 square miles. It ranks #2141 of 3,222 U.S. county equivalents by land area.
Is Cumberland County the largest county in New Jersey?
No. Cumberland County ranks #5 of 21 in New Jersey by land area. The largest is Burlington County, with 799.3 square miles of land.
What counties border Cumberland County?
Cumberland County shares a land border with Salem County, Atlantic County, Cape May County, and Gloucester County.
What is the population of Cumberland County?
The Census Bureau estimates Cumberland County had 157,148 residents on July 1, 2025, ranking #454 of 3,222 county equivalents. That is 325 people per square mile of land.
What is the county seat of Cumberland County?
The county seat of Cumberland County is Bridgeton.
What cities and towns are in Cumberland County?
Cumberland County has 14 county subdivisions (cities, towns and townships). The most populous five are Vineland city, Bridgeton city, Millville city, Upper Deerfield township, and Fairfield township.
Is Cumberland County part of a metropolitan area?
Yes. It is a central county of the Vineland, NJ Metropolitan Statistical Area.
How many ZIP codes are in Cumberland County?
22 ZIP Code Tabulation Areas have land in Cumberland County, and 19 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does Cumberland County compare with U.S. states?
It has less land than every state. Rhode Island, the smallest, has 2.1 times as much land.
How many acres of land are in Cumberland County?
The land measurement converts to approximately 309,363 acres. Including water, total area is approximately 433,821 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.