The map above shows Idaho and Wisconsin side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Wisconsin Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Wisconsin has 54,168 square miles (140,294 km²). Idaho's land area is 1.5 times (53%) larger than Wisconsin's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Wisconsin: 65,497 square miles (169,636 km²), including inland and coastal water. Idaho's total area is 1.3 times (28%) larger than Wisconsin's.
Length: Idaho is 483 miles (778 km) long from north to south; Wisconsin is 368 miles (593 km). Idaho's north-south length is 1.3 times (31%) longer than Wisconsin's.
Width: Idaho spans 352 miles (566 km) east to west; Wisconsin spans 323 miles (521 km). Idaho's east-west width is 1.1 times (9%) wider than Wisconsin's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Wisconsin's is Timms Hill at 1,946 feet (593 m). Borah Peak is 10,685 feet higher than Timms Hill.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Wisconsin's is Lake Michigan at 577 feet. Wisconsin's lowest point is 141 feet lower.
Idaho vs Wisconsin Population and History
Population: Idaho has a population of 2,001,619 (2024), while Wisconsin has 5,960,975 (2024). Wisconsin's population is 3.0 times (198%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Wisconsin: 110.0. Wisconsin's population density is 4.5 times (355%) higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Wisconsin's is Milwaukee with 563,531. Milwaukee's population is 2.4 times (137%) larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Wisconsin's Minneapolis-St. Paul-Bloomington, MN-WI metro area (3,757,952). Minneapolis-St. Paul-Bloomington, MN-WI metro area's population is 4.4 times (344%) larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Wisconsin: Admitted to the Union on May 29, 1848, as the 30th state. In its current form, Wisconsin is the older of the two by 42 years.
Idaho vs Wisconsin Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Wisconsin's $453.3 billion. Wisconsin's economic output is 3.5 times (251%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Wisconsin: $76,044. Wisconsin's GDP per capita is 1.2 times (18%) higher than Idaho's.
Average income: Idaho: $62,323 vs Wisconsin: $67,755 average income per person (per capita personal income). Wisconsin's average income is 1.1 times (9%) higher than Idaho's.
Idaho vs Wisconsin Counties
Number of counties: Idaho has 44 counties, while Wisconsin has 72. Wisconsin's county count is 1.6 times (64%) higher than Idaho's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Wisconsin's is Marathon County at 1,545 square miles. Idaho County's land area is 5.5 times (449%) larger than Marathon County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Wisconsin: Pepin County (232 sq mi). Payette County's land area is 1.8 times (75%) larger than Pepin County's.
Most populous county: Idaho: Ada County (535,799 people) vs Wisconsin: Milwaukee County (924,740 people). Milwaukee County's population is 1.7 times (73%) larger than Ada County's.
Least populous county: Idaho: Clark County (794 people) vs Wisconsin: Menominee County (4,286 people). Menominee County's population is 5.4 times (440%) larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Wisconsin: Ozaukee County ($109,947). Blaine County's income is 1.8 times (84%) richer than Ozaukee County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Wisconsin: Menominee County ($43,696). Menominee County's income is 1.5 times (48%) richer than Madison County's.
Idaho vs Wisconsin Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Wisconsin has a top income tax rate of 7.65%. Wisconsin's top rate is 2.35 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Wisconsin: 1.25% of home value per year. Wisconsin's rate is 0.82 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Wisconsin: 5.72%. Idaho's combined rate is 0.31 percentage points higher.
Official Websites
Idaho official website · Wisconsin official website
More Size Comparisons
All Idaho size comparisons · All Wisconsin 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.