The map above shows Montana and Western Australia side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Montana vs Western Australia Geography
Land area: Montana has a land area of 145,550 square miles (376,973 km²), while Western Australia has 975,685 square miles (2,527,013 km²). Western Australia's land area is 6.7 times (570%) larger than Montana's.
Total area: Montana: 147,043 square miles (380,840 km²) vs Western Australia: 975,685 square miles (2,527,013 km²), including inland and coastal water. Western Australia's total area is 6.6 times (564%) larger than Montana's.
Length: Montana is 319 miles (514 km) long from north to south; Western Australia is 1,590 miles (2,558 km). Western Australia's north-south length is 5.0 times (398%) longer than Montana's.
Width: Montana spans 607 miles (976 km) east to west; Western Australia spans 1,286 miles (2,069 km). Western Australia's east-west width is 2.1 times (112%) wider than Montana's.
Highest point: Montana's highest point is Granite Peak at 12,767 feet (3,891 m); Western Australia's is Mount Meharry at 4,098 feet (1,249 m). Granite Peak is 8,669 feet higher than Mount Meharry.
Lowest point: Montana's lowest point is Kootenai River at 1,805 feet; Western Australia's is Indian Ocean at 0 feet. Western Australia's lowest point is 1,805 feet lower.
Montana vs Western Australia Population and History
Population: Montana has a population of 1,137,233 (2024), while Western Australia has 3,061,672 (2025). Western Australia's population is 2.7 times (169%) larger than Montana's.
Population density: Montana: 7.8 people per square mile vs Western Australia: 3.1. Montana's population density is 2.5 times (152%) higher than Western Australia's.
Largest metro area: Montana's largest metropolitan area is Billings, MT metro area (192,531 people) vs Western Australia's Greater Perth (2,452,765). Greater Perth's population is 12.7 times larger than Billings, MT metro area's.
History: Montana: Admitted to the Union on November 8, 1889, as the 41st state. Western Australia: Became an Australian state at Federation on January 1, 1901; founded as a colony in 1829. In its current form, Montana is the older of the two by 12 years.
Montana vs Western Australia Economy
GDP: Montana's GDP is $78.4 billion (2024) vs Western Australia's $304.6 billion. Western Australia's economic output is 3.9 times (289%) larger than Montana's.
GDP per capita: Montana: $68,975 per person vs Western Australia: $99,488. Western Australia's GDP per capita is 1.4 times (44%) higher than Montana's.
Official Websites
Montana official website · Western Australia official website
More Size Comparisons
All Montana size comparisons · All Western Australia 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.