The map above shows Idaho and Kentucky side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Kentucky Geography
Land area
- Idaho has a land area of 82,645 square miles (214,051 km²), while Kentucky has 39,485 square miles (102,267 km²).
- Idaho's land area is 2.1 times (109%) larger than Kentucky's.
Total area
- Idaho: 83,569 square miles (216,441 km²) vs Kentucky: 40,406 square miles (104,651 km²), including inland and coastal water.
- Idaho's total area is 2.1 times (107%) larger than Kentucky's.
Length
- Idaho is 483 miles (778 km) long from north to south; Kentucky is 257 miles (414 km).
- Idaho's north-south length is 1.9 times (88%) longer than Kentucky's.
Width
- Idaho spans 352 miles (566 km) east to west; Kentucky spans 418 miles (672 km).
- Kentucky's east-west width is 1.2 times (19%) wider than Idaho's.
Highest point
- Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Kentucky's is Black Mountain at 4,134 feet (1,260 m).
- Borah Peak is 8,497 feet higher than Black Mountain.
Lowest point
- Idaho's lowest point is Snake River at 718 feet; Kentucky's is Mississippi River at 270 feet.
- Kentucky's lowest point is 448 feet lower.
Idaho vs Kentucky Population and History
Population
- Idaho has a population of 2,001,619 (2024), while Kentucky has 4,588,372 (2024).
- Kentucky's population is 2.3 times (129%) larger than Idaho's.
Population density
- Idaho: 24.2 people per square mile vs Kentucky: 116.2.
- Kentucky's population density is 4.8 times (380%) higher than Idaho's.
Biggest city
- Idaho's biggest city is Boise with 237,963 people; Kentucky's is Louisville with 640,796.
- Louisville's population is 2.7 times (169%) larger than Boise's.
Largest metro area
- Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Kentucky's Cincinnati, OH-KY-IN metro area (2,302,815).
- Cincinnati, OH-KY-IN metro area's population is 2.7 times (172%) larger than Boise City, ID metro area's.
History
- Idaho: Admitted to the Union on July 3, 1890, as the 43rd state.
- Kentucky: Admitted to the Union on June 1, 1792, as the 15th state.
- In its current form, Kentucky is the older of the two by 98 years.
Idaho vs Kentucky Economy
GDP
- Idaho's GDP is $129.0 billion (2024) vs Kentucky's $295.4 billion.
- Kentucky's economic output is 2.3 times (129%) larger than Idaho's.
GDP per capita
- Idaho: $64,457 per person vs Kentucky: $64,375.
- Idaho and Kentucky have about the same GDP per capita.
Average income
- Idaho: $62,323 vs Kentucky: $58,256 average income per person (per capita personal income).
- Idaho's average income is 1.1 times (7%) higher than Kentucky's.
Idaho vs Kentucky Counties
Number of counties
- Idaho has 44 counties, while Kentucky has 120.
- Kentucky's county count is 2.7 times (173%) higher than Idaho's.
Biggest county by area
- Idaho's largest county is Idaho County at 8,478 square miles; Kentucky's is Pike County at 786 square miles.
- Idaho County's land area is 10.8 times larger than Pike County's.
Smallest county by area
- Idaho: Payette County (407 sq mi) vs Kentucky: Gallatin County (98 sq mi).
- Payette County's land area is 4.1 times (314%) larger than Gallatin County's.
Most populous county
- Idaho: Ada County (535,799 people) vs Kentucky: Jefferson County (793,881 people).
- Jefferson County's population is 1.5 times (48%) larger than Ada County's.
Least populous county
- Idaho: Clark County (794 people) vs Kentucky: Robertson County (2,382 people).
- Robertson County's population is 3.0 times (200%) larger than Clark County's.
Richest county
- Idaho: Blaine County ($202,612 per capita income) vs Kentucky: Oldham County ($87,137).
- Blaine County's income is 2.3 times (133%) richer than Oldham County's.
Poorest county
- Idaho: Madison County ($29,485 per capita income) vs Kentucky: Elliott County ($31,817).
- Elliott County's income is 1.1 times (8%) richer than Madison County's.
Idaho vs Kentucky Taxes
State income tax
- Idaho has a top income tax rate of 5.3%, while Kentucky has a top income tax rate of 3.5%.
- Idaho's top rate is 1.8 percentage points higher.
Property tax
- Idaho: 0.43% effective rate vs Kentucky: 0.71% of home value per year.
- Kentucky's rate is 0.28 percentage points higher.
Sales tax
- Idaho: 6.03% combined state and average local rate vs Kentucky: 6%.
- Idaho's combined rate is 0.03 percentage points higher.
Official Websites
Idaho official website · Kentucky official website
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More Size Comparisons
All Idaho size comparisons · All Kentucky 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.