The map above shows Colorado and Montana side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Colorado vs Montana Geography
Land area: Colorado has a land area of 103,637 square miles (268,419 km²), while Montana has 145,550 square miles (376,973 km²). Montana's land area is 1.4 times (40%) larger than Colorado's.
Total area: Colorado: 104,095 square miles (269,605 km²) vs Montana: 147,043 square miles (380,840 km²), including inland and coastal water. Montana's total area is 1.4 times (41%) larger than Colorado's.
Length: Colorado is 467 miles (751 km) long from north to south; Montana is 319 miles (514 km). Colorado's north-south length is 1.5 times (46%) longer than Montana's.
Width: Colorado spans 387 miles (622 km) east to west; Montana spans 607 miles (976 km). Montana's east-west width is 1.6 times (57%) wider than Colorado's.
Highest point: Colorado's highest point is Mount Elbert at 14,422 feet (4,396 m); Montana's is Granite Peak at 12,767 feet (3,891 m). Mount Elbert is 1,655 feet higher than Granite Peak.
Lowest point: Colorado's lowest point is Arikaree River at 3,326 feet; Montana's is Kootenai River at 1,805 feet. Montana's lowest point is 1,521 feet lower.
Colorado vs Montana Population and History
Population: Colorado has a population of 5,957,493 (2024), while Montana has 1,137,233 (2024). Colorado's population is 5.2 times (424%) larger than Montana's.
Population density: Colorado: 57.5 people per square mile vs Montana: 7.8. Colorado's population density is 7.4 times (637%) higher than Montana's.
Biggest city: Colorado's biggest city is Denver with 729,019 people; Montana's is Billings with 121,483. Denver's population is 6.0 times (500%) larger than Billings'.
Largest metro area: Colorado's largest metropolitan area is Denver-Aurora-Centennial, CO metro area (3,052,498 people) vs Montana's Billings, MT metro area (192,531). Denver-Aurora-Centennial, CO metro area's population is 15.9 times larger than Billings, MT metro area's.
History: Colorado: Admitted to the Union on August 1, 1876, as the 38th state. Montana: Admitted to the Union on November 8, 1889, as the 41st state. In its current form, Colorado is the older of the two by 13 years.
Colorado vs Montana Economy
GDP: Colorado's GDP is $557.6 billion (2024) vs Montana's $78.4 billion. Colorado's economic output is 7.1 times (611%) larger than Montana's.
GDP per capita: Colorado: $93,602 per person vs Montana: $68,975. Colorado's GDP per capita is 1.4 times (36%) higher than Montana's.
Average income: Colorado: $83,055 vs Montana: $69,240 average income per person (per capita personal income). Colorado's average income is 1.2 times (20%) higher than Montana's.
Colorado vs Montana Counties
Number of counties: Colorado has 64 counties, while Montana has 56. Colorado's county count is 1.1 times (14%) higher than Montana's.
Biggest county by area: Colorado's largest county is Las Animas County at 4,773 square miles; Montana's is Beaverhead County at 5,543 square miles. Beaverhead County's land area is 1.2 times (16%) larger than Las Animas County's.
Smallest county by area: Colorado: Broomfield County (33 sq mi) vs Montana: Silver Bow County (718 sq mi). Silver Bow County's land area is 21.8 times larger than Broomfield County's.
Most populous county: Colorado: El Paso County (752,772 people) vs Montana: Yellowstone County (171,583 people). El Paso County's population is 4.4 times (339%) larger than Yellowstone County's.
Least populous county: Colorado: Hinsdale County (747 people) vs Montana: Petroleum County (525 people). Hinsdale County's population is 1.4 times (42%) larger than Petroleum County's.
Richest county: Colorado: Pitkin County ($275,044 per capita income) vs Montana: Gallatin County ($94,573). Pitkin County's income is 2.9 times (191%) richer than Gallatin County's.
Poorest county: Colorado: Crowley County ($27,232 per capita income) vs Montana: Blaine County ($37,554). Blaine County's income is 1.4 times (38%) richer than Crowley County's.
Colorado vs Montana Taxes
State income tax: Colorado has a top income tax rate of 4.4%, while Montana has a top income tax rate of 5.65%. Montana's top rate is 1.25 percentage points higher.
Property tax: Colorado: 0.49% effective rate vs Montana: 0.69% of home value per year. Montana's rate is 0.2 percentage points higher.
Sales tax: Colorado: 7.89% combined state and average local rate vs Montana: 0%. Colorado's combined rate is 7.89 percentage points higher.
Official Websites
Colorado official website · Montana official website
More Size Comparisons
All Colorado 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.