3520 a mailing address

3520 is a mailing address in the United States. Here's a breakdown of what it might look like:

• 3520 is the street address or suite number
• The city and state would depend on the context, but here are a few possibilities:
  • 3520 Main St, Anytown, CA 12345 (California)
  • 3520 Oak St, Springfield, IL 62701 (Illinois)
  • 3520 Broadway, New York, NY 10001 (New York)

Without more information, it's difficult to determine the exact city and state. If you have more context or details, I'd be happy to try and help you further!