The map above shows Connecticut and Idaho side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Connecticut vs Idaho Geography
Land area: Connecticut has a land area of 4,843 square miles (12,542 km²), while Idaho has 82,645 square miles (214,051 km²). Idaho's land area is 17.1 times larger than Connecticut's.
Total area: Connecticut: 5,544 square miles (14,358 km²) vs Idaho: 83,569 square miles (216,441 km²), including inland and coastal water. Idaho's total area is 15.1 times larger than Connecticut's.
Length: Connecticut is 73 miles (118 km) long from north to south; Idaho is 483 miles (778 km). Idaho's north-south length is 6.6 times (562%) longer than Connecticut's.
Width: Connecticut spans 104 miles (167 km) east to west; Idaho spans 352 miles (566 km). Idaho's east-west width is 3.4 times (238%) wider than Connecticut's.
Highest point: Connecticut's highest point is Mount Frissell (south slope) at 2,376 feet (724 m); Idaho's is Borah Peak at 12,631 feet (3,850 m). Borah Peak is 10,255 feet higher than Mount Frissell (south slope).
Lowest point: Connecticut's lowest point is Long Island Sound at 0 feet; Idaho's is Snake River at 718 feet. Connecticut's lowest point is 718 feet lower.
Connecticut vs Idaho Population and History
Population: Connecticut has a population of 3,675,069 (2024), while Idaho has 2,001,619 (2024). Connecticut's population is 1.8 times (84%) larger than Idaho's.
Population density: Connecticut: 758.9 people per square mile vs Idaho: 24.2. Connecticut's population density is 31.4 times higher than Idaho's.
Biggest city: Connecticut's biggest city is Bridgeport with 151,599 people; Idaho's is Boise with 237,963. Boise's population is 1.6 times (57%) 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 Idaho's Boise City, ID metro area (845,877). Hartford-West Hartford-East Hartford, CT metro area's population is 1.4 times (38%) larger than Boise City, ID metro area's.
History: Connecticut: Admitted to the Union on January 9, 1788, as the 5th state. Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. In its current form, Connecticut is the older of the two by 102 years.
Connecticut vs Idaho Economy
GDP: Connecticut's GDP is $356.8 billion (2024) vs Idaho's $129.0 billion. Connecticut's economic output is 2.8 times (177%) larger than Idaho's.
GDP per capita: Connecticut: $97,096 per person vs Idaho: $64,457. Connecticut's GDP per capita is 1.5 times (51%) higher than Idaho's.
Average income: Connecticut: $95,067 vs Idaho: $62,323 average income per person (per capita personal income). Connecticut's average income is 1.5 times (53%) higher than Idaho's.
Connecticut vs Idaho Counties
Number of counties: Connecticut has 9 counties, while Idaho has 44. Idaho's county count is 4.9 times (389%) higher than Connecticut's.
Biggest county by area: Connecticut's largest county is Capitol Planning Region at 1,027 square miles; Idaho's is Idaho County at 8,478 square miles. Idaho County's land area is 8.3 times (725%) larger than Capitol Planning Region's.
Smallest county by area: Connecticut: Greater Bridgeport Planning Region (140 sq mi) vs Idaho: Payette County (407 sq mi). Payette County's land area is 2.9 times (190%) larger than Greater Bridgeport Planning Region's.
Most populous county: Connecticut: Capitol Planning Region (991,508 people) vs Idaho: Ada County (535,799 people). Capitol Planning Region's population is 1.9 times (85%) larger than Ada County's.
Least populous county: Connecticut: Northeastern Connecticut Planning Region (97,701 people) vs Idaho: Clark County (794 people). Northeastern Connecticut Planning Region's population is 123.0 times larger than Clark County's.
Richest county: Connecticut: Western Connecticut Planning Region ($165,513 per capita income) vs Idaho: Blaine County ($202,612). Blaine County's income is 1.2 times (22%) richer than Western Connecticut Planning Region's.
Poorest county: Connecticut: Southeastern Connecticut Planning Region ($64,845 per capita income) vs Idaho: Madison County ($29,485). Southeastern Connecticut Planning Region's income is 2.2 times (120%) richer than Madison County's.
Connecticut vs Idaho Taxes
State income tax: Connecticut has a top income tax rate of 6.99%, while Idaho has a top income tax rate of 5.3%. Connecticut's top rate is 1.69 percentage points higher.
Property tax: Connecticut: 1.66% effective rate vs Idaho: 0.43% of home value per year. Connecticut's rate is 1.23 percentage points higher.
Sales tax: Connecticut: 6.35% combined state and average local rate vs Idaho: 6.03%. Connecticut's combined rate is 0.32 percentage points higher.
Official Websites
Connecticut official website · Idaho official website
More Size Comparisons
All Connecticut size comparisons · All Idaho 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.