The map above shows Arizona and Montana side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Arizona vs Montana Geography
Land area: Arizona has a land area of 113,655 square miles (294,366 km²), while Montana has 145,550 square miles (376,973 km²). Montana's land area is 1.3 times (28%) larger than Arizona's.
Total area: Arizona: 113,985 square miles (295,220 km²) vs Montana: 147,043 square miles (380,840 km²), including inland and coastal water. Montana's total area is 1.3 times (29%) larger than Arizona's.
Length: Arizona is 429 miles (690 km) long from north to south; Montana is 319 miles (514 km). Arizona's north-south length is 1.3 times (34%) longer than Montana's.
Width: Arizona spans 452 miles (727 km) east to west; Montana spans 607 miles (976 km). Montana's east-west width is 1.3 times (34%) wider than Arizona's.
Highest point: Arizona's highest point is Humphreys Peak at 12,620 feet (3,847 m); Montana's is Granite Peak at 12,767 feet (3,891 m). Granite Peak is 147 feet higher than Humphreys Peak.
Lowest point: Arizona's lowest point is Colorado River at 71 feet; Montana's is Kootenai River at 1,805 feet. Arizona's lowest point is 1,734 feet lower.
Arizona vs Montana Population and History
Population: Arizona has a population of 7,582,384 (2024), while Montana has 1,137,233 (2024). Arizona's population is 6.7 times (567%) larger than Montana's.
Population density: Arizona: 66.7 people per square mile vs Montana: 7.8. Arizona's population density is 8.6 times (755%) higher than Montana's.
Biggest city: Arizona's biggest city is Phoenix with 1,673,164 people; Montana's is Billings with 121,483. Phoenix's population is 13.8 times larger than Billings'.
Largest metro area: Arizona's largest metropolitan area is Phoenix-Mesa-Chandler, AZ metro area (5,186,958 people) vs Montana's Billings, MT metro area (192,531). Phoenix-Mesa-Chandler, AZ metro area's population is 26.9 times larger than Billings, MT metro area's.
History: Arizona: Admitted to the Union on February 14, 1912, as the 48th state. Montana: Admitted to the Union on November 8, 1889, as the 41st state. In its current form, Montana is the older of the two by 23 years.
Arizona vs Montana Economy
GDP: Arizona's GDP is $570.1 billion (2024) vs Montana's $78.4 billion. Arizona's economic output is 7.3 times (627%) larger than Montana's.
GDP per capita: Arizona: $75,186 per person vs Montana: $68,975. Arizona's GDP per capita is 1.1 times (9%) higher than Montana's.
Average income: Arizona: $65,798 vs Montana: $69,240 average income per person (per capita personal income). Montana's average income is 1.1 times (5%) higher than Arizona's.
Arizona vs Montana Counties
Number of counties: Arizona has 15 counties, while Montana has 56. Montana's county count is 3.7 times (273%) higher than Arizona's.
Biggest county by area: Arizona's largest county is Coconino County at 18,616 square miles; Montana's is Beaverhead County at 5,543 square miles. Coconino County's land area is 3.4 times (236%) larger than Beaverhead County's.
Smallest county by area: Arizona: Santa Cruz County (1,236 sq mi) vs Montana: Silver Bow County (718 sq mi). Santa Cruz County's land area is 1.7 times (72%) larger than Silver Bow County's.
Most populous county: Arizona: Maricopa County (4,673,096 people) vs Montana: Yellowstone County (171,583 people). Maricopa County's population is 27.2 times larger than Yellowstone County's.
Least populous county: Arizona: Greenlee County (9,410 people) vs Montana: Petroleum County (525 people). Greenlee County's population is 17.9 times larger than Petroleum County's.
Richest county: Arizona: Maricopa County ($72,176 per capita income) vs Montana: Gallatin County ($94,573). Gallatin County's income is 1.3 times (31%) richer than Maricopa County's.
Poorest county: Arizona: Graham County ($44,164 per capita income) vs Montana: Blaine County ($37,554). Graham County's income is 1.2 times (18%) richer than Blaine County's.
Arizona vs Montana Taxes
State income tax: Arizona has a top income tax rate of 2.5%, while Montana has a top income tax rate of 5.65%. Montana's top rate is 3.15 percentage points higher.
Property tax: Arizona: 0.43% effective rate vs Montana: 0.69% of home value per year. Montana's rate is 0.26 percentage points higher.
Sales tax: Arizona: 8.54% combined state and average local rate vs Montana: 0%. Arizona's combined rate is 8.54 percentage points higher.
Official Websites
Arizona official website · Montana official website
More Size Comparisons
All Arizona size comparisons · All Montana 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.