The map above shows Arizona and Colorado side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Arizona vs Colorado Geography
Land area: Arizona has a land area of 113,655 square miles (294,366 km²), while Colorado has 103,637 square miles (268,419 km²). Arizona's land area is 1.1 times (10%) larger than Colorado's.
Total area: Arizona: 113,985 square miles (295,220 km²) vs Colorado: 104,095 square miles (269,605 km²), including inland and coastal water. Arizona's total area is 1.1 times (10%) larger than Colorado's.
Length: Arizona is 429 miles (690 km) long from north to south; Colorado is 467 miles (751 km). Colorado's north-south length is 1.1 times (9%) longer than Arizona's.
Width: Arizona spans 452 miles (727 km) east to west; Colorado spans 387 miles (622 km). Arizona's east-west width is 1.2 times (17%) wider than Colorado's.
Highest point: Arizona's highest point is Humphreys Peak at 12,620 feet (3,847 m); Colorado's is Mount Elbert at 14,422 feet (4,396 m). Mount Elbert is 1,802 feet higher than Humphreys Peak.
Lowest point: Arizona's lowest point is Colorado River at 71 feet; Colorado's is Arikaree River at 3,326 feet. Arizona's lowest point is 3,255 feet lower.
Arizona vs Colorado Population and History
Population: Arizona has a population of 7,582,384 (2024), while Colorado has 5,957,493 (2024). Arizona's population is 1.3 times (27%) larger than Colorado's.
Population density: Arizona: 66.7 people per square mile vs Colorado: 57.5. Arizona's population density is 1.2 times (16%) higher than Colorado's.
Biggest city: Arizona's biggest city is Phoenix with 1,673,164 people; Colorado's is Denver with 729,019. Phoenix's population is 2.3 times (130%) larger than Denver's.
Largest metro area: Arizona's largest metropolitan area is Phoenix-Mesa-Chandler, AZ metro area (5,186,958 people) vs Colorado's Denver-Aurora-Centennial, CO metro area (3,052,498). Phoenix-Mesa-Chandler, AZ metro area's population is 1.7 times (70%) larger than Denver-Aurora-Centennial, CO metro area's.
History: Arizona: Admitted to the Union on February 14, 1912, as the 48th state. Colorado: Admitted to the Union on August 1, 1876, as the 38th state. In its current form, Colorado is the older of the two by 36 years.
Arizona vs Colorado Economy
GDP: Arizona's GDP is $570.1 billion (2024) vs Colorado's $557.6 billion. Arizona and Colorado have about the same economic output.
GDP per capita: Arizona: $75,186 per person vs Colorado: $93,602. Colorado's GDP per capita is 1.2 times (24%) higher than Arizona's.
Average income: Arizona: $65,798 vs Colorado: $83,055 average income per person (per capita personal income). Colorado's average income is 1.3 times (26%) higher than Arizona's.
Arizona vs Colorado Counties
Number of counties: Arizona has 15 counties, while Colorado has 64. Colorado's county count is 4.3 times (327%) higher than Arizona's.
Biggest county by area: Arizona's largest county is Coconino County at 18,616 square miles; Colorado's is Las Animas County at 4,773 square miles. Coconino County's land area is 3.9 times (290%) larger than Las Animas County's.
Smallest county by area: Arizona: Santa Cruz County (1,236 sq mi) vs Colorado: Broomfield County (33 sq mi). Santa Cruz County's land area is 37.5 times larger than Broomfield County's.
Most populous county: Arizona: Maricopa County (4,673,096 people) vs Colorado: El Paso County (752,772 people). Maricopa County's population is 6.2 times (521%) larger than El Paso County's.
Least populous county: Arizona: Greenlee County (9,410 people) vs Colorado: Hinsdale County (747 people). Greenlee County's population is 12.6 times larger than Hinsdale County's.
Richest county: Arizona: Maricopa County ($72,176 per capita income) vs Colorado: Pitkin County ($275,044). Pitkin County's income is 3.8 times (281%) richer than Maricopa County's.
Poorest county: Arizona: Graham County ($44,164 per capita income) vs Colorado: Crowley County ($27,232). Graham County's income is 1.6 times (62%) richer than Crowley County's.
Arizona vs Colorado Taxes
State income tax: Arizona has a top income tax rate of 2.5%, while Colorado has a top income tax rate of 4.4%. Colorado's top rate is 1.9 percentage points higher.
Property tax: Arizona: 0.43% effective rate vs Colorado: 0.49% of home value per year. Colorado's rate is 0.06 percentage points higher.
Sales tax: Arizona: 8.54% combined state and average local rate vs Colorado: 7.89%. Arizona's combined rate is 0.65 percentage points higher.
Official Websites
Arizona official website · Colorado official website
More Size Comparisons
All Arizona size comparisons · All Colorado 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.