ABOUT THIS GUIDE

One envelope.
A clearer address.

Envelope Address Guide helps you understand where an address goes, find a familiar example, and format your own address.

What the builder supports

Common street, apartment, suite, unit, and PO Box addresses in the 50 US states and Washington, DC. You can preview a recipient address, add an optional return address, and copy the formatted text.

International addresses, military mail (APO, FPO, and DPO), US territory formats, and dual addresses are outside this version’s automatic formatting scope. For these situations, consult USPS directly.

What a preview means

The builder checks required fields, state abbreviations, and ZIP Code syntax. It does not check whether an address exists, whether a city matches a ZIP Code, or whether mail can be delivered. A preview is not a print template, a mailing label, or valid postage.

Examples are fictional demonstration data. They have not been verified for delivery. Enter and check your actual details before addressing your envelope.

Where the guidance comes from

The explanations are original summaries of the official USPS references below. This is an independent guide and formatting tool; it is not a USPS product and is not affiliated with or endorsed by USPS.

• USPS: How to Send a Letter or Postcard — Domestic
• USPS Publication 28: Postal Addressing Standards
• Publication 28, section 212: Address block format
• Publication 28, section 213: Apartment and suite designators
• Publication 28, section 281: PO Box format
• USPS Domestic Mail Manual 602: Addressing

Your address stays in your browser

The application processes address inputs in your browser without uploading or saving them. Clipboard copying happens only when you select a Copy button. Read the privacy details for the distinction between address inputs and ordinary hosting access data.