The map above shows Connecticut and Massachusetts side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Connecticut vs Massachusetts Geography
Land area: Connecticut has a land area of 4,843 square miles (12,542 km²), while Massachusetts has 7,801 square miles (20,204 km²). Massachusetts' land area is 1.6 times (61%) larger than Connecticut's.
Total area: Connecticut: 5,544 square miles (14,358 km²) vs Massachusetts: 10,554 square miles (27,335 km²), including inland and coastal water. Massachusetts' total area is 1.9 times (90%) larger than Connecticut's.
Length: Connecticut is 73 miles (118 km) long from north to south; Massachusetts is 123 miles (198 km). Massachusetts' north-south length is 1.7 times (68%) longer than Connecticut's.
Width: Connecticut spans 104 miles (167 km) east to west; Massachusetts spans 185 miles (297 km). Massachusetts' east-west width is 1.8 times (78%) wider than Connecticut's.
Highest point: Connecticut's highest point is Mount Frissell (south slope) at 2,376 feet (724 m); Massachusetts's is Mount Greylock at 3,489 feet (1,063 m). Mount Greylock is 1,113 feet higher than Mount Frissell (south slope).
Lowest point: Connecticut's lowest point is Long Island Sound at 0 feet; Massachusetts's is Atlantic Ocean at 0 feet. Both lowest points are at or near sea level.
Connecticut vs Massachusetts Population and History
Population: Connecticut has a population of 3,675,069 (2024), while Massachusetts has 7,136,171 (2024). Massachusetts' population is 1.9 times (94%) larger than Connecticut's.
Population density: Connecticut: 758.9 people per square mile vs Massachusetts: 914.8. Massachusetts' population density is 1.2 times (21%) higher than Connecticut's.
Biggest city: Connecticut's biggest city is Bridgeport with 151,599 people; Massachusetts's is Boston with 673,458. Boston's population is 4.4 times (344%) larger than Bridgeport's.
Largest metro area: Connecticut's largest metropolitan area is Hartford-West Hartford-East Hartford, CT metro area (1,169,048 people) vs Massachusetts's Boston-Cambridge-Newton, MA-NH metro area (5,025,517). Boston-Cambridge-Newton, MA-NH metro area's population is 4.3 times (330%) larger than Hartford-West Hartford-East Hartford, CT metro area's.
History: Connecticut: Admitted to the Union on January 9, 1788, as the 5th state. Massachusetts: Admitted to the Union on February 6, 1788, as the 6th state.
Connecticut vs Massachusetts Economy
GDP: Connecticut's GDP is $356.8 billion (2024) vs Massachusetts's $778.5 billion. Massachusetts' economic output is 2.2 times (118%) larger than Connecticut's.
GDP per capita: Connecticut: $97,096 per person vs Massachusetts: $109,095. Massachusetts' GDP per capita is 1.1 times (12%) higher than Connecticut's.
Average income: Connecticut: $95,067 vs Massachusetts: $93,607 average income per person (per capita personal income). Connecticut and Massachusetts have about the same average income.
Connecticut vs Massachusetts Counties
Number of counties: Connecticut has 9 counties, while Massachusetts has 14. Massachusetts' county count is 1.6 times (56%) higher than Connecticut's.
Biggest county by area: Connecticut's largest county is Capitol Planning Region at 1,027 square miles; Massachusetts's is Worcester County at 1,511 square miles. Worcester County's land area is 1.5 times (47%) larger than Capitol Planning Region's.
Smallest county by area: Connecticut: Greater Bridgeport Planning Region (140 sq mi) vs Massachusetts: Nantucket County (46 sq mi). Greater Bridgeport Planning Region's land area is 3.0 times (203%) larger than Nantucket County's.
Most populous county: Connecticut: Capitol Planning Region (991,508 people) vs Massachusetts: Middlesex County (1,668,956 people). Middlesex County's population is 1.7 times (68%) larger than Capitol Planning Region's.
Least populous county: Connecticut: Northeastern Connecticut Planning Region (97,701 people) vs Massachusetts: Nantucket County (14,670 people). Northeastern Connecticut Planning Region's population is 6.7 times (566%) larger than Nantucket County's.
Richest county: Connecticut: Western Connecticut Planning Region ($165,513 per capita income) vs Massachusetts: Nantucket County ($129,250). Western Connecticut Planning Region's income is 1.3 times (28%) richer than Nantucket County's.
Poorest county: Connecticut: Southeastern Connecticut Planning Region ($64,845 per capita income) vs Massachusetts: Hampshire County ($65,432). Southeastern Connecticut Planning Region and Hampshire County have about the same income.
Connecticut vs Massachusetts Taxes
State income tax: Connecticut has a top income tax rate of 6.99%, while Massachusetts has a top income tax rate of 9%. Massachusetts's top rate is 2.01 percentage points higher.
Property tax: Connecticut: 1.66% effective rate vs Massachusetts: 1% of home value per year. Connecticut's rate is 0.66 percentage points higher.
Sales tax: Connecticut: 6.35% combined state and average local rate vs Massachusetts: 6.25%. Connecticut's combined rate is 0.1 percentage points higher.
Official Websites
Connecticut official website · Massachusetts official website
More Size Comparisons
All Connecticut size comparisons · All Massachusetts size comparisons
Area, elevation and boundary figures come from official national statistics and US Census Bureau and Natural Earth boundary data; US state population, economic, county and tax figures come from the US Census Bureau, the Bureau of Economic Analysis and the Tax Foundation. Figures are rounded and for general reference.