Sending mail within the United States requires precision, and the foundation of that precision is the address block. A correctly formatted destination ensures your letter, package, or invoice travels efficiently through the postal network and arrives on the intended recipient's desk or doorstep. Misplaced commas or ambiguous abbreviations can cause delays, returns, or even permanent loss of your item. This guide provides a definitive, step-by-step breakdown of how to write a US address on an envelope, covering every nuance from standard formatting to international exceptions.
Understanding the Anatomy of a US Address
The United States Postal Service (USPS) relies on a specific hierarchy to sort mail automatically and manually. The standard format moves from the specific unit to the broad geographic region. This sequence ensures that machines and human sorters can quickly identify the destination. Grasping this structure is the first step in writing an address correctly, whether you are using a classic white envelope or a padded mailer for delicate items.
Line 1: The Recipient and Street Information
The first line of the address block contains the recipient's name followed by their street address. Always capitalize the recipient's name if known. For the street address, use the street number followed by the street name, and include any unit, apartment, or suite number on the same line. The USPS recommends using the street suffix (Street, Avenue, Boulevard) in full or using the standard two-letter abbreviation (St, Ave, Blvd). Avoid unnecessary punctuation such as commas between the street number and name.
Line 2: The City, State, and ZIP Code
The second line consolidates the city, state, and ZIP Code into a single, compact block. The city name should be spelled out in full and capitalized, with no abbreviations. Directly after the city, include a two-letter state abbreviation as defined by the US Postal Service (for example, CA for California or NY for New York). No punctuation or commas should separate the state abbreviation from the city or the ZIP Code. The ZIP Code, which includes the basic 5-digit code or the extended 9-digit ZIP+4 code, should be placed immediately after the state abbreviation with no spaces or hyphens connecting the parts.
Component | Example | Notes
Recipient Name | John Smith | Use title if appropriate (Mr., Ms., Dr.)
Street Address | 123 Main St | Use unit/apartment number on same line: 4B
City | Los Angeles | Spell out fully, capitalize first letter
State | CA | Two-letter postal abbreviation, no comma
ZIP Code | 90001 | 5-digit or ZIP+4 format
Formatting Rules and Best Practices
Beyond the structural elements, the physical presentation of the text matters. Use clear, legible printing or typing. The USPS strongly prefers uppercase block letters for automated processing, though mixed case is generally accepted by human handlers. Avoid using decorative fonts, script, or italics. Utilize the return address, which should be placed in the top left corner of the envelope or on the back of the envelope flap; this ensures the mail can be returned to you if delivery fails for any reason.
