The map above shows Idaho and Maine side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Maine Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Maine has 30,845 square miles (79,888 km²). Idaho's land area is 2.7 times (168%) larger than Maine's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Maine: 35,380 square miles (91,634 km²), including inland and coastal water. Idaho's total area is 2.4 times (136%) larger than Maine's.
Length: Idaho is 483 miles (778 km) long from north to south; Maine is 311 miles (501 km). Idaho's north-south length is 1.6 times (55%) longer than Maine's.
Width: Idaho spans 352 miles (566 km) east to west; Maine spans 203 miles (327 km). Idaho's east-west width is 1.7 times (73%) wider than Maine's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Maine's is Mount Katahdin at 5,253 feet (1,601 m). Borah Peak is 7,378 feet higher than Mount Katahdin.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Maine's is Atlantic Ocean at 0 feet. Maine's lowest point is 718 feet lower.
Idaho vs Maine Population and History
Population: Idaho has a population of 2,001,619 (2024), while Maine has 1,405,012 (2024). Idaho's population is 1.4 times (42%) larger than Maine's.
Population density: Idaho: 24.2 people per square mile vs Maine: 45.6. Maine's population density is 1.9 times (88%) higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Maine's is Portland with 69,568. Boise's population is 3.4 times (242%) larger than Portland's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Maine's Portland-South Portland, ME metro area (571,534). Boise City, ID metro area's population is 1.5 times (48%) larger than Portland-South Portland, ME metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Maine: Admitted to the Union on March 15, 1820, as the 23rd state. In its current form, Maine is the older of the two by 70 years.
Idaho vs Maine Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Maine's $99.2 billion. Idaho's economic output is 1.3 times (30%) larger than Maine's.
GDP per capita: Idaho: $64,457 per person vs Maine: $70,586. Maine's GDP per capita is 1.1 times (10%) higher than Idaho's.
Average income: Idaho: $62,323 vs Maine: $68,932 average income per person (per capita personal income). Maine's average income is 1.1 times (11%) higher than Idaho's.
Idaho vs Maine Counties
Number of counties: Idaho has 44 counties, while Maine has 16. Idaho's county count is 2.8 times (175%) higher than Maine's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Maine's is Aroostook County at 6,671 square miles. Idaho County's land area is 1.3 times (27%) larger than Aroostook County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Maine: Sagadahoc County (254 sq mi). Payette County's land area is 1.6 times (60%) larger than Sagadahoc County's.
Most populous county: Idaho: Ada County (535,799 people) vs Maine: Cumberland County (313,809 people). Ada County's population is 1.7 times (71%) larger than Cumberland County's.
Least populous county: Idaho: Clark County (794 people) vs Maine: Piscataquis County (17,432 people). Piscataquis County's population is 22.0 times larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Maine: Cumberland County ($90,142). Blaine County's income is 2.2 times (125%) richer than Cumberland County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Maine: Franklin County ($52,725). Franklin County's income is 1.8 times (79%) richer than Madison County's.
Idaho vs Maine Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Maine has a top income tax rate of 7.15%. Maine's top rate is 1.85 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Maine: 0.91% of home value per year. Maine's rate is 0.48 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Maine: 5.5%. Idaho's combined rate is 0.53 percentage points higher.
Official Websites
Idaho official website · Maine official website
More Size Comparisons
All Idaho size comparisons · All Maine 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.