County Maps US

Sussex County, New Jersey

A county in New Jersey, ranked 17 of 21 by population.

CountyFIPS 34037

Within New Jersey
Sussex County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Newton, the county seat, located via the 2025 Census Gazetteer.

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Population
148,063
+4,186 (+2.9%) since 2020
Land area
518.5
square miles. A further 3.2% of the total area is water
Population density
286
people per square mile, computed rather than published
County seat
Newton
Seat of county government.
Established
1753
272 years ago
Largest city
Hopatcong borough
Population 14,824.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Sussex County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Sussex County, New Jersey from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 782 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Sussex County ranks

Position among the 21 counties of New Jersey, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn New JerseyNationally
Population148,06317th of 21468th of 3,144
Land area518.5 sq mi4th of 212,014th of 3,144
Population density286 per sq mi20th of 21455th of 3,144
Median household income$116,1866th of 2166th of 3,143

Full data for Sussex County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population148,063Vintage 2025 Population Estimates
Population in 2020143,877Vintage 2025 Population Estimates
2020 estimates base?144,235Vintage 2025 Population Estimates
Land area518.5 sq mi2025 Gazetteer Files
Water area16.9 sq mi2025 Gazetteer Files
Total area535.4 sq mi2025 Gazetteer Files
Population density?286 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$116,186American Community Survey 2020-2024 5-Year Estimates
Median home value$369,400American Community Survey 2020-2024 5-Year Estimates
Median age43.8American Community Survey 2020-2024 5-Year Estimates
Households57,767American Community Survey 2020-2024 5-Year Estimates
Housing units62,865American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+107
1,423 births, 1,316 deaths
Net migration
+511
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Sussex County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Pike CountyPennsylvania27 mi62,808
Morris CountyNew Jersey23 mi524,251
Orange CountyNew York20 mi417,669
Warren CountyNew Jersey16 mi112,953
Passaic CountyNew Jersey11 mi531,624
Monroe CountyPennsylvania1.8 mi167,179

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 21 counties of New Jersey

Open the interactive New Jersey county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.