Concord Reaches 95.5% of New Hampshire — Among America's Most Centralised State Capitals

By SimpleMapLab·Published 13 May 2026·Rank #9 of 50 states·↑ All 50 states

95.5% of New Hampshire’s population — roughly 1.39 M of the state’s 1.45 M residents — lives within 100 miles of Concord. New Hampshire ranks #9 of 50 states for capital-to-population centrality.

A 100-mile geodesic radius around the Concord, NH state capitol overlaid on New Hampshire. 95.5% of New Hampshire's population lives inside the dashed ring.

95.5%

of New Hampshire’s population within 100 miles of Concord

1.39 M

residents inside the radius (of 1.45 M statewide)

6 mi

from Concord to New Hampshire’s population centroid

of 50 states ranked by capital-to-population centrality

Open this radius in the map → /tools/map-radius-tool · Concord, NH · 100 mi
The link opens the SimpleMapLab Map Radius Tool with the 100-mile circle already drawn around the Concord capitol. Change the radius to 50, 250, or any value to compare different framings.

Why this happened

Few US states keep this share of their residents inside their capital's reach. The 100-mile radius around Concord encloses essentially all of New Hampshire's population centres — including Manchester (the largest city inside, with roughly 120K residents) — and extends almost to the population centroid itself. New Hampshire ranks #9 of 50 states for capital-to-population centrality.

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 Concord. Cities are listed by total population captured by ZIP centroids in the dataset.

#	City	Population in radius
1	Manchester	120,101
2	Nashua	91,294
3	Concord	50,566
4	Derry	34,474
5	Dover	33,440

The largest city outside the radius

New Hampshire’s most-populous city outside the 100-mile circle is Colebrook, sitting 117 miles from Concord. The aggregated population of Colebrook’s ZIP codes alone — 2,764 residents — illustrates the gap between New Hampshire’s political seat and its population centre.

How New Hampshire compares

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

#8 Maine

Augusta · 96.5% pop. captured

#10 Utah

Salt Lake City · 88.5% pop. captured

#7 Massachusetts

Boston · 98.2% pop. captured

#11 Michigan

Lansing · 88.0% pop. captured

#6 Maryland

Annapolis · 98.4% pop. captured

Draw it yourself

Open the 100-mile circle around Concord →

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 Concord’s reach with that of Manchester, or add a second circle for a side-by-side comparison.

Methodology (brief)

We took the lat/lng of the New Hampshire state capitol building (43.2081°, -71.5376°) and drew a 100-mile geodesic radius. For every ZIP code in New Hampshire, we tested whether the ZIP centroid falls inside; if so, its population counts. We then divide by New Hampshire’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 Concord: How Much of New Hampshire Is Inside? Part of the State Capital Radius study. Retrieved from https://www.simplemaplab.com/studies/state-capital-radius/new-hampshire. Licensed under CC-BY 4.0.