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98.4% of Maryland's Residents Live Within 100 Miles of Annapolis, Mapped

By SimpleMapLab·Published 13 May 2026·Rank #6 of 50 states·↑ All 50 states

98.4% of Maryland’s population — roughly 6.11 M of the state’s 6.21 M residents — lives within 100 miles of Annapolis. Maryland ranks #6 of 50 states for capital-to-population centrality.

Map: 100-mile geodesic radius around Annapolis, MD, showing the share of Maryland captured inside the circle.Dark forest-green stroke = the state boundary of Maryland. Dashed forest-green ring = the 100-mile geodesic radius around the Annapolis state capitol. The filled green dot marks the capitol location.Annapolis
A 100-mile geodesic radius around the Annapolis, MD state capitol overlaid on Maryland. 98.4% of Maryland's population lives inside the dashed ring.
98.4%
of Maryland’s population within 100 miles of Annapolis
6.11 M
residents inside the radius (of 6.21 M statewide)
20 mi
from Annapolis to Maryland’s population centroid
#6
of 50 states ranked by capital-to-population centrality
Open this radius in the map → /tools/map-radius-tool · Annapolis, MD · 100 mi
The link opens the SimpleMapLab Map Radius Tool with the 100-mile circle already drawn around the Annapolis 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 Annapolis encloses essentially all of Maryland's population centres — including Baltimore (the largest city inside, with roughly 592K residents) — and extends almost to the population centroid itself. Maryland ranks #6 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 Annapolis. Cities are listed by total population captured by ZIP centroids in the dataset.

#CityPopulation in radius
1Baltimore591,752
2Silver Spring309,699
3Hyattsville171,875
4Frederick154,625
5Rockville145,330

The largest city outside the radius

Maryland’s most-populous city outside the 100-mile circle is Cumberland, sitting 130 miles from Annapolis. The aggregated population of Cumberland’s ZIP codes alone — 41,015 residents — illustrates the gap between Maryland’s political seat and its population centre.

How Maryland compares

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

#5 Vermont
Montpelier · 98.6% pop. captured
#7 Massachusetts
Boston · 98.2% pop. captured
#4 Rhode Island
Providence · 100.0% pop. captured
#8 Maine
Augusta · 96.5% pop. captured
#3 New Jersey
Trenton · 100.0% pop. captured

Draw it yourself

Open the 100-mile circle around Annapolis →

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

Methodology (brief)

We took the lat/lng of the Maryland state capitol building (38.9784°, -76.4922°) and drew a 100-mile geodesic radius. For every ZIP code in Maryland, we tested whether the ZIP centroid falls inside; if so, its population counts. We then divide by Maryland’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 Annapolis: How Much of Maryland Is Inside? Part of the State Capital Radius study. Retrieved from https://www.simplemaplab.com/studies/state-capital-radius/maryland. Licensed under CC-BY 4.0.