10. Michigan
- area: 253,800 km²
- state capital: Lansing
- date of joining the Union: January 26, 1837
- number of counties: 83
9. Oregon
- area: 255,000 km²
- state capital: Salem
- date of joining the Union: February 14, 1859
- number of counties: 36
8. Colorado
- area: 269,800 km²
- state capital: Denver
- date of joining the Union: August 1, 1876
- number of counties: 64
7. Nevada
- area: 286,400 km²
- state capital: Carson City
- date of joining the Union: October 31, 1864
- number of counties: 16
6. Arizona
- area: 295,300 km²
- state capital: Phoenix
- date of joining the Union: February 14, 1912
- number of counties: 15
5. New Mexico
- area: 315,200 km²
- state capital: Santa Fe
- date of joining the Union: January 6, 1912
- number of counties: 33
4. Montana
- area: 381,100 km²
- state capital: Helena
- date of joining the Union: November 8, 1889
- number of counties: 56
3. California
- area: 410,000 km²
- state capital: Sacramento
- date of joining the Union: September 9, 1850
- number of counties: 58
2. Texas
- area: 678,000 km²
- state capital: Austin
- date of joining the Union: December 29, 1845
- number of counties: 254
1. Alaska
- area: 1,717,800 km²
- state capital: Juneau
- date of joining the Union: January 3, 1959
- number of counties: 0
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