The map above shows Connecticut and South Dakota side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Connecticut vs South Dakota Geography
Land area
- Connecticut has a land area of 4,843 square miles (12,542 km²), while South Dakota has 75,808 square miles (196,342 km²).
- South Dakota's land area is 15.7 times larger than Connecticut's.
Total area
- Connecticut: 5,544 square miles (14,358 km²) vs South Dakota: 77,116 square miles (199,729 km²), including inland and coastal water.
- South Dakota's total area is 13.9 times larger than Connecticut's.
Length
- Connecticut is 73 miles (118 km) long from north to south; South Dakota is 443 miles (712 km).
- South Dakota's north-south length is 6.1 times (507%) longer than Connecticut's.
Width
- Connecticut spans 104 miles (167 km) east to west; South Dakota spans 371 miles (597 km).
- South Dakota's east-west width is 3.6 times (257%) wider than Connecticut's.
Highest point
- Connecticut's highest point is Mount Frissell (south slope) at 2,376 feet (724 m); South Dakota's is Black Elk Peak at 7,198 feet (2,194 m).
- Black Elk Peak is 4,822 feet higher than Mount Frissell (south slope).
Lowest point
- Connecticut's lowest point is Long Island Sound at 0 feet; South Dakota's is Big Stone Lake at 966 feet.
- Connecticut's lowest point is 966 feet lower.
Connecticut vs South Dakota Population and History
Population
- Connecticut has a population of 3,675,069 (2024), while South Dakota has 924,669 (2024).
- Connecticut's population is 4.0 times (297%) larger than South Dakota's.
Population density
- Connecticut: 758.9 people per square mile vs South Dakota: 12.2.
- Connecticut's population density is 62.2 times higher than South Dakota's.
Biggest city
- Connecticut's biggest city is Bridgeport with 151,599 people; South Dakota's is Sioux Falls with 209,289.
- Sioux Falls' population is 1.4 times (38%) 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 South Dakota's Sioux Falls, SD-MN metro area (308,266).
- Hartford-West Hartford-East Hartford, CT metro area's population is 3.8 times (279%) larger than Sioux Falls, SD-MN metro area's.
History
- Connecticut: Admitted to the Union on January 9, 1788, as the 5th state.
- South Dakota: Admitted to the Union on November 2, 1889, as the 40th state.
- In its current form, Connecticut is the older of the two by 101 years.
Connecticut vs South Dakota Economy
GDP
- Connecticut's GDP is $356.8 billion (2024) vs South Dakota's $76.8 billion.
- Connecticut's economic output is 4.6 times (365%) larger than South Dakota's.
GDP per capita
- Connecticut: $97,096 per person vs South Dakota: $83,052.
- Connecticut's GDP per capita is 1.2 times (17%) higher than South Dakota's.
Average income
- Connecticut: $95,067 vs South Dakota: $75,699 average income per person (per capita personal income).
- Connecticut's average income is 1.3 times (26%) higher than South Dakota's.
Connecticut vs South Dakota Counties
Number of counties
- Connecticut has 9 counties, while South Dakota has 66.
- South Dakota's county count is 7.3 times (633%) higher than Connecticut's.
Biggest county by area
- Connecticut's largest county is Capitol Planning Region at 1,027 square miles; South Dakota's is Meade County at 3,471 square miles.
- Meade County's land area is 3.4 times (238%) larger than Capitol Planning Region's.
Smallest county by area
- Connecticut: Greater Bridgeport Planning Region (140 sq mi) vs South Dakota: Clay County (412 sq mi).
- Clay County's land area is 2.9 times (194%) larger than Greater Bridgeport Planning Region's.
Most populous county
- Connecticut: Capitol Planning Region (991,508 people) vs South Dakota: Minnehaha County (208,639 people).
- Capitol Planning Region's population is 4.8 times (375%) larger than Minnehaha County's.
Least populous county
- Connecticut: Northeastern Connecticut Planning Region (97,701 people) vs South Dakota: Jones County (874 people).
- Northeastern Connecticut Planning Region's population is 111.8 times larger than Jones County's.
Richest county
- Connecticut: Western Connecticut Planning Region ($165,513 per capita income) vs South Dakota: Union County ($146,712).
- Western Connecticut Planning Region's income is 1.1 times (13%) richer than Union County's.
Poorest county
- Connecticut: Southeastern Connecticut Planning Region ($64,845 per capita income) vs South Dakota: Ziebach County ($32,778).
- Southeastern Connecticut Planning Region's income is 2.0 times (98%) richer than Ziebach County's.
Connecticut vs South Dakota Taxes
State income tax
- Connecticut has a top income tax rate of 6.99%, while South Dakota has no state income tax.
- Connecticut's top rate is 6.99 percentage points higher.
Property tax
- Connecticut: 1.66% effective rate vs South Dakota: 1.02% of home value per year.
- Connecticut's rate is 0.64 percentage points higher.
Sales tax
- Connecticut: 6.35% combined state and average local rate vs South Dakota: 6.11%.
- Connecticut's combined rate is 0.24 percentage points higher.
Official Websites
Connecticut official website · South Dakota official website
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More Size Comparisons
All Connecticut size comparisons · All South Dakota 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.