The map above shows Arizona and Idaho side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Arizona vs Idaho Geography
Land area
- Arizona has a land area of 113,655 square miles (294,366 km²), while Idaho has 82,645 square miles (214,051 km²).
- Arizona's land area is 1.4 times (38%) larger than Idaho's.
Total area
- Arizona: 113,985 square miles (295,220 km²) vs Idaho: 83,569 square miles (216,441 km²), including inland and coastal water.
- Arizona's total area is 1.4 times (36%) larger than Idaho's.
Length
- Arizona is 429 miles (690 km) long from north to south; Idaho is 483 miles (778 km).
- Idaho's north-south length is 1.1 times (13%) longer than Arizona's.
Width
- Arizona spans 452 miles (727 km) east to west; Idaho spans 352 miles (566 km).
- Arizona's east-west width is 1.3 times (28%) wider than Idaho's.
Highest point
- Arizona's highest point is Humphreys Peak at 12,620 feet (3,847 m); Idaho's is Borah Peak at 12,631 feet (3,850 m).
- Borah Peak is 11 feet higher than Humphreys Peak.
Lowest point
- Arizona's lowest point is Colorado River at 71 feet; Idaho's is Snake River at 718 feet.
- Arizona's lowest point is 647 feet lower.
Arizona vs Idaho Population and History
Population
- Arizona has a population of 7,582,384 (2024), while Idaho has 2,001,619 (2024).
- Arizona's population is 3.8 times (279%) larger than Idaho's.
Population density
- Arizona: 66.7 people per square mile vs Idaho: 24.2.
- Arizona's population density is 2.8 times (176%) higher than Idaho's.
Biggest city
- Arizona's biggest city is Phoenix with 1,673,164 people; Idaho's is Boise with 237,963.
- Phoenix's population is 7.0 times (603%) larger than Boise's.
Largest metro area
- Arizona's largest metropolitan area is Phoenix-Mesa-Chandler, AZ metro area (5,186,958 people) vs Idaho's Boise City, ID metro area (845,877).
- Phoenix-Mesa-Chandler, AZ metro area's population is 6.1 times (513%) larger than Boise City, ID metro area's.
History
- Arizona: Admitted to the Union on February 14, 1912, as the 48th state.
- Idaho: Admitted to the Union on July 3, 1890, as the 43rd state.
- In its current form, Idaho is the older of the two by 22 years.
Arizona vs Idaho Economy
GDP
- Arizona's GDP is $570.1 billion (2024) vs Idaho's $129.0 billion.
- Arizona's economic output is 4.4 times (342%) larger than Idaho's.
GDP per capita
- Arizona: $75,186 per person vs Idaho: $64,457.
- Arizona's GDP per capita is 1.2 times (17%) higher than Idaho's.
Average income
- Arizona: $65,798 vs Idaho: $62,323 average income per person (per capita personal income).
- Arizona's average income is 1.1 times (6%) higher than Idaho's.
Arizona vs Idaho Counties
Number of counties
- Arizona has 15 counties, while Idaho has 44.
- Idaho's county count is 2.9 times (193%) higher than Arizona's.
Biggest county by area
- Arizona's largest county is Coconino County at 18,616 square miles; Idaho's is Idaho County at 8,478 square miles.
- Coconino County's land area is 2.2 times (120%) larger than Idaho County's.
Smallest county by area
- Arizona: Santa Cruz County (1,236 sq mi) vs Idaho: Payette County (407 sq mi).
- Santa Cruz County's land area is 3.0 times (204%) larger than Payette County's.
Most populous county
- Arizona: Maricopa County (4,673,096 people) vs Idaho: Ada County (535,799 people).
- Maricopa County's population is 8.7 times (772%) larger than Ada County's.
Least populous county
- Arizona: Greenlee County (9,410 people) vs Idaho: Clark County (794 people).
- Greenlee County's population is 11.9 times larger than Clark County's.
Richest county
- Arizona: Maricopa County ($72,176 per capita income) vs Idaho: Blaine County ($202,612).
- Blaine County's income is 2.8 times (181%) richer than Maricopa County's.
Poorest county
- Arizona: Graham County ($44,164 per capita income) vs Idaho: Madison County ($29,485).
- Graham County's income is 1.5 times (50%) richer than Madison County's.
Arizona vs Idaho Taxes
State income tax
- Arizona has a top income tax rate of 2.5%, while Idaho has a top income tax rate of 5.3%.
- Idaho's top rate is 2.8 percentage points higher.
Property tax
- Arizona: 0.43% effective rate vs Idaho: 0.43% of home value per year.
- The two are essentially equal.
Sales tax
- Arizona: 8.54% combined state and average local rate vs Idaho: 6.03%.
- Arizona's combined rate is 2.51 percentage points higher.
Official Websites
Arizona official website · Idaho official website
Download the Arizona vs Idaho Size Comparison Map for free
To download the map, right-click the image above (or press and hold on a phone or tablet) and choose Save image as. The map is free to use anywhere, including on your own website or in print, as long as you credit it with a link back to this page or to BrilliantMaps.com.
More Size Comparisons
All Arizona 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.