The wiki specifies that if a road exists outside of a municipality, the “No City” option is used. Literally, that would mean no unincorporated city names are used such as Peyton, Falcon outside of Colorado Springs. Are these the rules that we are following? Also not sure about Black Forest which is not incorporated, but is a “census designated place”.
We use CDP names in Colorado. Examples of this can be found in and around the Denver metro as well. All(?) CDP names that existed in 2006 were part of the original TIGER import in 2009, any new ones since then should be added.
In http://dtdapps.coloradodot.info/otis/Flex/MapView this amounts to turning on Cities and Census Designated Places 2010 under Boundaries. There’s additional cities that were added beyond that, one example would be Bailey.
Using the CDP names makes sense. What about rural areas. For example, there is a “Peyton” CDP, but it is a small area (what us locals call “Peyton Proper” aka “The Postoffice”). My mailing address is Peyton, but should the roads out by me be marked as No City if they are not within any CDP boundary? If so, I see Falcon as being an exception. It is not a CDP, but it is a very recognised area. In my over-zealousness, I have changed a lot of roads out near me to Peyton. I will certainly change them back if needed.
If you can find a government sourced map of the boundaries that’s enough justification IMO. CDP is simple because CDOT provides us with tools and they’re an approved source.