General Rules
* Commas: Use commas to separate the elements of an address: street number, street name, city, state, and zip code.
* Periods: Use periods to end the sentence.
Examples
* Full Address: The package was delivered to 123 Main Street, Anytown, CA 12345.
* Street Address Only: The store is located at 456 Elm Avenue.
* City, State: He moved to San Francisco, California, last year.
* Shortened Form: They live at 789 Oak Street.
Specific Cases
* "Apt." or "Suite": Use a comma after the street number if you're including an apartment or suite number. Example: 101 Oak Street, Apt. 2B, Anytown, CA 12345.
* PO Boxes: Use a comma after "PO Box". Example: The letter was sent to PO Box 555, Anytown, CA 12345.
Key Points
* Consistency is key. Choose a punctuation style and stick with it throughout your writing.
* Consider your audience. If you're writing for a formal publication, be extra careful to follow the correct punctuation rules.
Let me know if you'd like more examples or have other punctuation questions!