County outline
Where Atlantic County is located
Area breakdown
Land accounts for 82.7% of Atlantic County’s measured area and water for 17.3%. Its combined area converts to 1,740 square kilometers or approximately 429,974 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 555.583 | 1,438.953 | 355,573.1 |
| Water | 116.252 | 301.091 | 74,401.3 |
| Total | 671.835 | 1,740.045 | 429,974.4 |
How Atlantic County compares
By original Census land area, Atlantic County ranks #3 of 21 in New Jersey and #1868 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 1.725 times the New Jersey county-equivalent median of 322 square miles. It accounts for 7.6% 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 Atlantic County
The Census Bureau estimates that 278,657 people lived in Atlantic County on July 1, 2025. That ranks #264 of 3,222 county equivalents nationally and #15 of 21 in New Jersey. Since the April 1, 2020 estimates base of 274,541, the population has grown by 4,116 (+1.5%), compared with +2.8% for New Jersey as a whole.
With 555.6 square miles of land, that is 502 people per square mile (194 per km²), placing Atlantic County #339 nationally for density and #15 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 1.3 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 274,192 | 274,909 | 275,872 | 276,643 | 278,467 | 278,657 |
| Change | — | +717 | +963 | +771 | +1,824 | +190 |
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 Atlantic County
Atlantic County is divided into 23 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 Egg Harbor township, with 48,435 residents (17.4% of the county). The largest by land is Hamilton township, at 110.9 mi², or 20% of the county’s land. Among those with at least 1,000 residents in 2020, Weymouth township grew fastest since then (+5.2%).
| County subdivision | Population 2025 | Since 2020 | Land mi² | Share of county land |
|---|---|---|---|---|
| Egg Harbor township | 48,435 | +1.2% | 67 | 12.1% |
| Atlantic City city | 38,787 | +0.8% | 10.8 | 1.9% |
| Galloway township | 38,380 | +1.4% | 88.7 | 16% |
| Hamilton township | 28,845 | +5% | 110.9 | 20% |
| Pleasantville city | 20,853 | +1.1% | 5.721 | 1% |
| Hammonton town | 15,060 | +2.4% | 40.7 | 7.3% |
| Somers Point city | 10,590 | +1.1% | 4.01 | 0.7% |
| Ventnor City city | 9,345 | +1.5% | 1.955 | 0.4% |
| Absecon city | 9,209 | +0.9% | 5.532 | 1% |
| Northfield city | 8,496 | +0.8% | 3.582 | 0.6% |
| Brigantine city | 7,658 | −0.8% | 6.523 | 1.2% |
| Buena Vista township | 7,175 | +2% | 41.1 | 7.4% |
| Linwood city | 7,051 | +1.3% | 3.811 | 0.7% |
| Mullica township | 5,853 | +0.7% | 56.4 | 10.1% |
| Margate City city | 5,194 | −2.2% | 1.422 | 0.3% |
Show the other 8 subdivisions
| Name | Population 2025 | Since 2020 | Land mi² |
|---|---|---|---|
| Buena borough | 4,529 | +0.3% | 7.573 |
| Egg Harbor City city | 4,426 | +0.8% | 10.9 |
| Weymouth township | 2,751 | +5.2% | 11.8 |
| Folsom borough | 1,834 | +1.5% | 8.264 |
| Estell Manor city | 1,696 | +2% | 53.4 |
| Port Republic city | 1,125 | +1.9% | 7.462 |
| Longport borough | 879 | −2% | 0.395 |
| Corbin City city | 486 | +2.7% | 7.697 |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Atlantic County. Land: 2026 Census Gazetteer. How communities are listed.
Metropolitan area
Atlantic County is a central county of the Atlantic City-Hammonton, NJ Metropolitan Statistical Area. Its 2 county equivalents have 372,047 residents on 807.1 square miles of land; Atlantic County accounts for 68.8% of the land and 74.9% of the residents. By combined land it ranks #303 of 393 metropolitan areas, and #153 by population. It belongs to the Philadelphia-Reading-Camden, PA-NJ-DE-MD Combined Statistical Area.
| County equivalent | Population 2025 | Land mi² |
|---|---|---|
| Atlantic County | 278,657 | 555.6 |
| Cape May County | 93,390 | 251.5 |
ZIP codes
30 ZIP Code Tabulation Areas have land in Atlantic County; 25 of them have most of their land inside the county, and the others mainly cover neighboring areas.
080370809408201082030820508215082170822108225082320823408240082410824408270083100831708319083260833008340083410834408346083500836008401084020840308406
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 Atlantic County
Atlantic County shares a land border with 6 county equivalents. It has more land than 4 of them. The largest neighbor is Burlington County (799.3 mi²) and the smallest is Camden County (221.4 mi²). Together with its neighbors, Atlantic County forms a block of 3,261.4 mi² of land, of which it holds 17%.
| Bordering county equivalent | Land mi² | Size vs. Atlantic | Compare |
|---|---|---|---|
| Burlington County | 799.3 | 1.4× larger | Compare |
| Ocean County | 628.3 | 1.1× larger | Compare |
| Cumberland County | 483.4 | 1.1× smaller | Compare |
| Gloucester County | 322 | 1.7× smaller | Compare |
| Cape May County | 251.5 | 2.2× smaller | Compare |
| Camden County | 221.4 | 2.5× smaller | Compare |
How big is Atlantic County compared with U.S. states?
Atlantic County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.9 times as much. New Jersey’s county land could hold about 13 areas the size of Atlantic County.
Another way to picture it: the same land area would fill a square about 23.6 miles (37.9 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 Atlantic County?
Atlantic County has more land than 1,354 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 Atlantic County at #1,517 nationally by total area, 351 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 17.3%, compared with a national county-equivalent median of 1.2% — 16.1 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 Atlantic County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #1867 | Richland Parish, Louisiana | 555.6 | Compare |
| #1868 | Atlantic County, New Jersey | 555.6 | This county |
| #1869 | Pointe Coupee Parish, Louisiana | 555.5 | 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 39.469355, -74.633759. 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: 1,438,954,306 m²; AWATER: 301,091,075 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 Atlantic County?
Atlantic County, New Jersey has 555.6 square miles (1,439 km²) of land and 116.3 square miles of water, for a total area of 671.8 square miles. It ranks #1868 of 3,222 U.S. county equivalents by land area.
Is Atlantic County the largest county in New Jersey?
No. Atlantic County ranks #3 of 21 in New Jersey by land area. The largest is Burlington County, with 799.3 square miles of land.
What counties border Atlantic County?
Atlantic County shares a land border with Burlington County, Cape May County, Cumberland County, Camden County, Gloucester County, and Ocean County.
What is the population of Atlantic County?
The Census Bureau estimates Atlantic County had 278,657 residents on July 1, 2025, ranking #264 of 3,222 county equivalents. That is 502 people per square mile of land.
What is the county seat of Atlantic County?
The county seat of Atlantic County is Mays Landing.
What cities and towns are in Atlantic County?
Atlantic County has 23 county subdivisions (cities, towns and townships). The most populous five are Egg Harbor township, Atlantic City city, Galloway township, Hamilton township, and Pleasantville city.
Is Atlantic County part of a metropolitan area?
Yes. It is a central county of the Atlantic City-Hammonton, NJ Metropolitan Statistical Area, which has 2 county equivalents and 372,047 residents.
How many ZIP codes are in Atlantic County?
30 ZIP Code Tabulation Areas have land in Atlantic County, and 25 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does Atlantic County compare with U.S. states?
It has less land than every state. Rhode Island, the smallest, has 1.9 times as much land.
How many acres of land are in Atlantic County?
The land measurement converts to approximately 355,573 acres. Including water, total area is approximately 429,974 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.