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The design for the flag of North Dakota is an almost exact copy of the unit banner carried by the state's troop contingent in the Philippine-American War. It was adopted by the state legislature on March 3, 1911, although the color was not precisely specified at that time. Legislation in 1943 brought the flag in line with the original troop banner, which is on display at the state historical museum in Bismarck.
| Flags of the U.S. states |
| Alabama | Alaska | Arizona | Arkansas | California | Colorado | Connecticut | Delaware | Florida | Georgia | Hawaii | Idaho | Illinois | Indiana | Iowa | Kansas | Kentucky | Louisiana | Maine | Maryland | Massachusetts | Michigan | Minnesota | Mississippi | Missouri | Montana | Nebraska | Nevada | New Hampshire | New Jersey | New Mexico | New York | North Carolina | North Dakota | Ohio | Oklahoma | Oregon | Pennsylvania | Rhode Island | South Carolina | South Dakota | Tennessee | Texas | Utah | Vermont | Virginia | Washington | West Virginia | Wisconsin | Wyoming |
| Other inhabited administrative areas |
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| American Samoa | Guam | Northern Mariana Islands | Puerto Rico | Virgin Islands | Washington D.C. |