Capitol Planning Region, CT vs Hampden County, MA
Neighbouring counties across the Connecticut and Massachusetts state line, compared on population, size, income and housing. They share 41 mi of border.
Capitol Planning Region
Connecticut
Hampden County
Massachusetts
Both outlines are drawn at true relative size. Hampden County spans about 77.8 km at its widest.
Side by side
| Measure | Capitol Planning Region | Difference | Hampden County |
|---|---|---|---|
| Population | 994,115 | +114.1% | 464,338 |
| Change since 2020 | 3.1% | +3.0 pp | 0.1% |
| Land area | 1,027 sq mi | +66.5% | 617 sq mi |
| Population density | 968 per sq mi | +28.6% | 753 per sq mi |
| Median household income | $93,394 | +31.0% | $71,306 |
| Median home value | $323,700 | +8.3% | $298,800 |
| Median age | 40.0 | the same | 40.0 |
| Households | 391,113 | +112.0% | 184,471 |
| Housing units | 416,559 | +110.8% | 197,591 |
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; US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. The difference column is computed here: the first county's figure against the second, expressed as a percentage of the second. The change-since-2020 row is the exception: two growth rates differ in percentage points (pp), not percent. Retrieved 30 August 2026.
What the numbers say
- Capitol Planning Region holds about 2.1 times the population of Hampden County: 994,115 against 464,338.
- Capitol Planning Region covers more ground, at 1,027 square miles against 617.
- Capitol Planning Region is the more crowded of the two, at 968 people per square mile against 753.
- Median household income is higher in Capitol Planning Region, by 22,088 dollars a year.
- Since 2020, Capitol Planning Region has grown by 3.1% and Hampden County has grown by 0.1%.
- They share 41 mi of common border, which the Census Bureau publishes in its county adjacency file and which almost no other county reference presents.
Full pages
Want a different pair? Compare any two of the 3,144 US counties.
Rebuilt from source data 30 August 2026. How these figures are produced.