An address beginning with RR or HC is not a PO Box just because it contains BOX. Keep the route designation, route number and box number together, then match them to the form’s documented fields. If a form insists on a house number and street name, ask how it handles route addresses instead of inventing a street address.
This guide covers US Rural Route (RR) and Highway Contract Route (HC) addresses. Similar abbreviations used in other countries may follow different rules.
Read the delivery line before choosing fields
USPS specifies separate formats for rural routes and highway contract routes:
RR [route number] BOX [box number]
HC [route number] BOX [box number]
These are placeholders, not addresses to mail to; the brackets are not input characters. Use the recipient’s confirmed current details, including the appropriate city, state and ZIP Code.
The number after RR or HC identifies the route. The value after BOX identifies the box. Neither should be relabelled as a house number or apartment number merely to satisfy a form. Do not choose RR or HC based on how remote the location looks.
A PO BOX is a different address type. The PO Box and street address guide explains those distinctions; Address Line 2 covers actual apartment and suite information.
Match the form without losing the box
The following is practical field-mapping advice. USPS mailpiece standards do not define every website’s input fields.
| Form design | What to check |
|---|---|
| A general Address Line 1 field | Keep the complete RR/HC delivery line in the field intended for it. Put city, state and ZIP in their own fields; do not split off BOX just to fill Line 2. |
| Separate route and box fields | Follow the site’s instructions, then check the combined saved address. |
| Mandatory house-number and street-name fields | Ask the site how to enter a route address. The route number is not a substitute house number. |
| A requirement for a physical street address | Ask the recipient for a current street-style address appropriate to that service, and confirm the available delivery method with the merchant. |
A rejected form does not, by itself, establish that the postal address is invalid. An accepted form does not establish that the selected carrier service will deliver there. When asking support, describe the address type and rejected field; avoid posting the recipient’s full private address publicly.
Do not combine two delivery styles
USPS says not to add street or town names to the RR delivery line or HC delivery line. If secondary name information is used, it belongs above that line on the mailpiece.
That does not mean deleting the city from the complete address. Nor does it mean a website’s Address Line 2 necessarily prints in the correct position. If both a street-style address and a route address have been supplied, confirm which complete version is appropriate instead of joining them into one delivery line.
Check old labels and number changes carefully
USPS converts RFD or RD to RR when they mean rural route, and STAR ROUTE usually refers to HC. This is not a rule to replace RD in ordinary street names.
A leading zero is unnecessary before an RR route number or HC route number. Do not extend that rule to ZIP Codes or box identifiers. Box-number hyphens depend on the official address record; do not add or remove them by guesswork.
Some old addresses have official replacements. USPS describes rural-to-street-style conversions in its LACSLink overview. That is a reason to confirm the current address with the recipient or local Post Office, not a formula for deriving a street number yourself.
Inspect the saved result
Before ordering or printing a label, compare the saved route marker, route number, BOX identifier, city, state and ZIP against the confirmed address. Watch for truncation, an omitted box or an automatic change to PO BOX. If using ZIP+4, it should match the relevant box range; see the ZIP+4 lookup guide instead of borrowing a nearby address’s extension.
The USAddressGen tool is for test-data and interface work; generated data is not a substitute for verifying a route delivery address. Sources were checked on November 2, 2026. We did not send mail or test merchant forms, and do not guarantee carrier acceptance, delivery or identity verification.