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US Largest Cities On State Borders
DirectionsName the cities of 5K+ population on state borders (border of one state with another, not international borders). A city is on the border with another state if its US Census border intersects with the US state border of a neighboring state.
Quiz Takers 
Why do Davenport and Bettendorf, IA count but not Moline or Rock Island, IL across the river? Cape Girardeau seems to be missing as well.
It looks like for the cities not included the actual city border doesn’t extend into the river where the state border is. You can see this pulling up the cities on Google Maps.