Apple synthesizes a lot of geographic data to produce the streets, features, and labels on its maps. The Maps app in iOS and macOS is exhaustive, but not always correct.
(This is contrary to the Hitchhiker’s Guide to the Galaxy, which maintains, “where it is inaccurate it is at least definitively inaccurate. In cases of major discrepancy it’s always reality that’s got it wrong.”)
If you find an errant label, such as your city or region mislabeled, an incorrect street name, or other details, Apple does let you report it, though you may have not realized you could.
How to Report an Issue in iOS Maps
In Maps for iOS, tap the info (i in a circle) button in any view, then tap Report an Issue. You can pick the kind of issue you want, like Map Labels, select the errant data from a map that appears, tap Next, and finally fill out a description of what’s wrong.

Maps for iOS offers more options to report problems more specifically.
How to Report an Issue in macOS Maps
In Maps for macOS, it appears that you have to drop a pin first, then tap the info icon. Scroll down to Report an Issue, click that button, select the kind of problem, and provide more information.

macOS Maps requires a few more hoops to report errors.
Maps for iOS offers more granular options for identifying problems, and I’d recommend starting there.
This Mac 911 article is in response to a question submitted by Macworld reader Matthew.
Ask Mac 911
We’ve compiled a list of the questions we get asked most frequently along with answers and links to columns: read our super FAQ to see if your question is covered. If not, we’re always looking for new problems to solve! Email yours to mac911@macworld.com including screen captures as appropriate, and whether you want your full name used. Every question won’t be answered, we don’t reply to email, and we cannot provide direct troubleshooting advice.