The map above shows Montana and Oklahoma side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Montana vs Oklahoma Geography
Land area: Montana has a land area of 145,550 square miles (376,973 km²), while Oklahoma has 68,597 square miles (177,665 km²). Montana's land area is 2.1 times (112%) larger than Oklahoma's.
Total area: Montana: 147,043 square miles (380,840 km²) vs Oklahoma: 69,899 square miles (181,038 km²), including inland and coastal water. Montana's total area is 2.1 times (110%) larger than Oklahoma's.
Length: Montana is 319 miles (514 km) long from north to south; Oklahoma is 533 miles (857 km). Oklahoma's north-south length is 1.7 times (67%) longer than Montana's.
Width: Montana spans 607 miles (976 km) east to west; Oklahoma spans 490 miles (789 km). Montana's east-west width is 1.2 times (24%) wider than Oklahoma's.
Highest point: Montana's highest point is Granite Peak at 12,767 feet (3,891 m); Oklahoma's is Black Mesa at 4,980 feet (1,518 m). Granite Peak is 7,787 feet higher than Black Mesa.
Lowest point: Montana's lowest point is Kootenai River at 1,805 feet; Oklahoma's is Little River at 289 feet. Oklahoma's lowest point is 1,516 feet lower.
Montana vs Oklahoma Population and History
Population: Montana has a population of 1,137,233 (2024), while Oklahoma has 4,095,393 (2024). Oklahoma's population is 3.6 times (260%) larger than Montana's.
Population density: Montana: 7.8 people per square mile vs Oklahoma: 59.7. Oklahoma's population density is 7.7 times (665%) higher than Montana's.
Biggest city: Montana's biggest city is Billings with 121,483 people; Oklahoma's is Oklahoma City with 712,919. Oklahoma City's population is 5.9 times (487%) larger than Billings'.
Largest metro area: Montana's largest metropolitan area is Billings, MT metro area (192,531 people) vs Oklahoma's Oklahoma City, OK metro area (1,497,821). Oklahoma City, OK metro area's population is 7.8 times (678%) larger than Billings, MT metro area's.
History: Montana: Admitted to the Union on November 8, 1889, as the 41st state. Oklahoma: Admitted to the Union on November 16, 1907, as the 46th state. In its current form, Montana is the older of the two by 18 years.
Montana vs Oklahoma Economy
GDP: Montana's GDP is $78.4 billion (2024) vs Oklahoma's $263.7 billion. Oklahoma's economic output is 3.4 times (236%) larger than Montana's.
GDP per capita: Montana: $68,975 per person vs Oklahoma: $64,388. Montana's GDP per capita is 1.1 times (7%) higher than Oklahoma's.
Average income: Montana: $69,240 vs Oklahoma: $63,708 average income per person (per capita personal income). Montana's average income is 1.1 times (9%) higher than Oklahoma's.
Montana vs Oklahoma Counties
Number of counties: Montana has 56 counties, while Oklahoma has 77. Oklahoma's county count is 1.4 times (38%) higher than Montana's.
Biggest county by area: Montana's largest county is Beaverhead County at 5,543 square miles; Oklahoma's is Osage County at 2,247 square miles. Beaverhead County's land area is 2.5 times (147%) larger than Osage County's.
Smallest county by area: Montana: Silver Bow County (718 sq mi) vs Oklahoma: Marshall County (372 sq mi). Silver Bow County's land area is 1.9 times (93%) larger than Marshall County's.
Most populous county: Montana: Yellowstone County (171,583 people) vs Oklahoma: Oklahoma County (816,490 people). Oklahoma County's population is 4.8 times (376%) larger than Yellowstone County's.
Least populous county: Montana: Petroleum County (525 people) vs Oklahoma: Cimarron County (2,133 people). Cimarron County's population is 4.1 times (306%) larger than Petroleum County's.
Richest county: Montana: Gallatin County ($94,573 per capita income) vs Oklahoma: Washington County ($126,749). Washington County's income is 1.3 times (34%) richer than Gallatin County's.
Poorest county: Montana: Blaine County ($37,554 per capita income) vs Oklahoma: Atoka County ($38,709). Blaine County and Atoka County have about the same income.
Montana vs Oklahoma Taxes
State income tax: Montana has a top income tax rate of 5.65%, while Oklahoma has a top income tax rate of 4.5%. Montana's top rate is 1.15 percentage points higher.
Property tax: Montana: 0.69% effective rate vs Oklahoma: 0.75% of home value per year. Oklahoma's rate is 0.06 percentage points higher.
Sales tax: Montana: 0% combined state and average local rate vs Oklahoma: 9.06%. Oklahoma's combined rate is 9.06 percentage points higher.
Official Websites
Montana official website · Oklahoma official website
More Size Comparisons
All Montana size comparisons · All Oklahoma 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.