Key takeaways
- A street address identifies a delivery location along a named road or thoroughfare
- The delivery line can include a primary number, direction, street name, suffix, and unit
- City, state, ZIP Code, and country are separate from the street address
- PO Boxes, rural routes, and general delivery are valid address types but are not ordinary street addresses
Authorship and review
Read our editorial and review principles- Written by
- Random Address Generator Editorial Team
- Reviewed by
- US Address Data Review Team
- Latest substantive update
- Published a field-by-field guide to street addresses, secondary units, rural routes, and form boundaries.
What people usually mean by street address
A street address points to a building or delivery location on a named street. In a US address, it usually contains the house or building number and street name. It may also contain a directional, street suffix, apartment, suite, floor, or room.
The phrase is narrower than mailing address. A PO Box is a mailing address, but it is not a street address. City, state, and ZIP Code complete the postal address, yet they do not belong inside the street-address field itself.
The pieces inside an American street address
Not every line uses every component, and the words are not safely interchangeable. N can be part of the official street name or a directional. ST might mean Street as a suffix, while a street named Saint Charles should not be rewritten by a blind abbreviation rule. Parse only when you have a trusted source or a reversible process.
| Component | Example | What can go wrong |
|---|---|---|
| Primary number | 225 | Treating hyphenated or alphanumeric numbers as invalid |
| Predirectional | N | Removing it and changing the destination |
| Street name | HUMPHREYS | Assuming it is always one word |
| Suffix | BLVD | Expanding or abbreviating the wrong token |
| Postdirectional | NW | Moving it before the street name |
| Secondary unit | STE 501 | Dropping the unit when lines are merged |
Street address examples that test different assumptions
A useful fixture set does more than swap street names. Include a directional, a multiword street, a numbered street, an apartment, and a primary number that contains a letter or hyphen. The purpose is to expose fragile parsing and layout decisions, not to imitate private residents.
| Synthetic delivery line | Behavior to test |
|---|---|
| 17 W 42ND ST | Numeric street name with a directional |
| 804 MARTIN LUTHER KING JR BLVD | Long multiword street name |
| 12-14 MARKET ST | Hyphenated primary number |
| 51B OAK AVE APT 3 | Alphanumeric primary number and apartment |
| 600 PINE ST NW STE 210 | Postdirectional plus suite |
Valid addresses that are not street addresses
USPS supports other delivery types, including Post Office Boxes, rural routes, highway contract routes, and general delivery. A form that labels its only field Street Address may confuse users whose valid mailing address begins with PO BOX or RR.
If the business truly requires a physical street location, say so and explain why. Otherwise, label the field Address Line 1 and validate according to the selected address type.
- PO BOX 417
- RR 2 BOX 81
- HC 3 BOX 19
- GENERAL DELIVERY
How to represent a street address in a form
For a simple consumer form, one required first line and one optional second line are often enough. Use the browser autocomplete tokens address-line1 and address-line2, then keep city, state, postal code, and country in their own fields. For systems that must search or standardize components, retain the original line alongside parsed fields.
Do not claim a delivery match because the line contains a number and known suffix. Format validation can catch blank or oversized values; current postal data is needed to verify the destination.
Frequently asked questions
What does a street address look like?
A US street address usually looks like 225 N HUMPHREYS BLVD STE 501: primary number, street details, and an optional unit on the delivery line.
Is a ZIP Code part of the street address?
No. It is part of the complete postal address, but it belongs in the locality line or a separate postal-code field.
Is a PO Box a street address?
No. It is a valid mailing address type provided by USPS, but it does not identify an ordinary street delivery point.
Can a street address contain letters?
Yes. Primary numbers, street names, building identifiers, and unit values can contain letters. A numbers-only rule will reject legitimate formats.