Write the street address first
Put the apartment, unit, or suite number on the same line after the street address
Separate it with a comma or use a line break if needed
Use labels like Apt, Apartment, Unit, or Suite
Example: 123 Main St, Apt 4B
Example: 123 Main St Apt 4B
Example: 123 Main St
Example: Apt 4B
Put the city, state, and ZIP code on the next line
Example:
123 Main St, Apt 4B
Springfield, IL 62704