Do you put a comma after AZ in an address?

Here's why:

* State abbreviations are part of the address: They are not a separate element like a city name.

* Commas are used to separate elements of an address: For example, between the street number and street name, or between the city and state.

Correct format:

123 Main Street

Anytown, AZ 12345

Incorrect format:

123 Main Street,

Anytown, AZ, 12345