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The 100-Mile Map of New Jersey: Trenton Covers the Entire State, With Room to Spare

By SimpleMapLab·Published 13 May 2026·Rank #3 of 50 states·↑ All 50 states

Every resident of New Jersey lives within 100 miles of Trenton. New Jersey is one of the four US states physically small enough to be fully enclosed by a 100-mile circle drawn from its capital.

Map: 100-mile geodesic radius around Trenton, NJ, showing the share of New Jersey captured inside the circle.Dark forest-green stroke = the state boundary of New Jersey. Dashed forest-green ring = the 100-mile geodesic radius around the Trenton state capitol. The filled green dot marks the capitol location.Trenton
A 100-mile geodesic radius around the Trenton, NJ state capitol overlaid on New Jersey. 100.0% of New Jersey's population lives inside the dashed ring.
100.0%
of New Jersey’s population within 100 miles of Trenton
9.34 M
residents inside the radius (of 9.34 M statewide)
23 mi
from Trenton to New Jersey’s population centroid
#3
of 50 states ranked by capital-to-population centrality
Open this radius in the map → /tools/map-radius-tool · Trenton, NJ · 100 mi
The link opens the SimpleMapLab Map Radius Tool with the 100-mile circle already drawn around the Trenton capitol. Change the radius to 50, 250, or any value to compare different framings.

Why this happened

Trenton sits at the geographic and historical midpoint of New Jersey — chosen as the capital in 1790 specifically because it was equidistant from the New York metro (north) and the Philadelphia metro (south). The 100-mile circle from Trenton easily encompasses every New Jersey resident plus most of New York City, all of Philadelphia, and stretches into Connecticut and Maryland. New Jersey is small enough that the radius story is almost meaningless — but the historical placement is the cleanest "compromise capital" example in the US.

The biggest cities inside the 100-mile radius

The top 5 most-populous places (by aggregated ZIP code population) sitting inside the 100-mile circle around Trenton. Cities are listed by total population captured by ZIP centroids in the dataset.

#CityPopulation in radius
1Newark310,602
2Jersey City294,078
3Trenton218,493
4Paterson158,694
5Lakewood139,149

How New Jersey compares

The states ranked closest to New Jersey on this metric. Click any to compare the radius breakdown directly.

#2 Delaware
Dover · 100.0% pop. captured
#4 Rhode Island
Providence · 100.0% pop. captured
#1 Connecticut
Hartford · 100.0% pop. captured
#5 Vermont
Montpelier · 98.6% pop. captured
#6 Maryland
Annapolis · 98.4% pop. captured

Draw it yourself

Open the 100-mile circle around Trenton →

The Map Radius Tool lets you change the radius (try 50 mi for an urban-suburban question or 250 mi for “a day’s drive”), drag the centre to compare Trenton’s reach with that of Newark, or add a second circle for a side-by-side comparison.

Methodology (brief)

We took the lat/lng of the New Jersey state capitol building (40.2206°, -74.7597°) and drew a 100-mile geodesic radius. For every ZIP code in New Jersey, we tested whether the ZIP centroid falls inside; if so, its population counts. We then divide by New Jersey’s total population to produce the percentage. The full methodology for all 50 states is on the hub page.

Suggested citation: SimpleMapLab (2026). 100 Miles Around Trenton: How Much of New Jersey Is Inside? Part of the State Capital Radius study. Retrieved from https://www.simplemaplab.com/studies/state-capital-radius/new-jersey. Licensed under CC-BY 4.0.