- Duncan (Alabama) in the state of Alabama
- Duncan (Arizona) in the state of Arizona
- Duncan (Arkansas) in the state of Arkansas
- Duncan (Colorado) in the state of Colorado
- Duncan (Illinois) in the state of Illinois
- Duncan (Indiana) in the state of Indiana
- Duncan (Iowa) in the state of Iowa
- Duncan (Kentucky) in the state of Kentucky
- Duncan (Kentucky) in the state of Kentucky
- Duncan (Mississippi) in the state of Mississippi
- Duncan (Missouri) in the state of Missouri
- Duncan (Nebraska) in the state of Nebraska
- Duncan (North Carolina) in the state of North Carolina
- Duncan (Oklahoma) in the state of Oklahoma
- Duncan (Oregon) in the state of Oregon
- Duncan (Pennsylvania) in the state of Pennsylvania
- Duncan (South Carolina) in the state of South Carolina
- Duncan (Tennessee) in the state of Tennessee
- Duncan (Virginia) in the state of Virginia
- Duncan (Washington) in the state of Washington (state)
- Duncan (West Virginia) in the state of West Virginia
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