Sometimes units are allowed because they are "grandfathered" into the code (built before the law made illegal), but this is going to be a local issue, and probably not something you can get a definative answer about in an online forum like this.If you're worried about insurance disallowing, why don't you call and ask a couple companies for a quote - if you explain the details, they should be able to tell you if it is not insurable.

This list would contain the zip code and corresponding name of the municipality.

I am in R4 zoning, which does not rule out STR's in almost all cases of municipal code I have looked into.

FHA requires inspections, seller-paid repairs to code, everything must have been perfectly permitted).

@Holli HaddicCheck with municipal/township if allowed and the codes requirements 

Building codes and older homes can change the equation as well.

I am looking for a zip code and/or neighborhood breakdown for my single family and multi family investment property search.

Mesa is a large city and it's best to get zip code specific whenever you're trying to determine how the real estate market is doing. 85201, 85202, 85210, and areas close by are some of the hottest in metro Phoenix.

Dear BP, I have a wholesale opportunity in the 36117 zip code.

As others have noted above, although looking at an area and zip code can give you a general idea of what to expect, you definitely need to look on a street by street basis.