How are city and state punctuated in a sentence?

Here's how to punctuate city and state in a sentence:

Basic Format:

* City, State

Example: I grew up in Chicago, Illinois.

Exceptions and Additional Notes:

* If the state is already clear from the context, you can omit it.

* If you use the state abbreviation, you don't need a comma:

* I grew up in Chicago, IL.

* Always use the two-letter postal abbreviation for the state.

* When using only the city and state, there is no period after the state abbreviation.

Let me know if you'd like more examples or have any other punctuation questions!