Short answer: Check the address fields, look up uncertain ZIP Codes, confirm unresolved recipient details, and inspect the printed labels before releasing a mailing. A USPS ZIP Code result does not confirm that a person or company currently occupies that address. Keep those two checks separate.
By PostageGrid Editorial Team. USPS sources checked October 6, 2026.
Define what your review can establish
An office address review has several jobs: catch missing fields, identify inconsistent records, resolve uncertain destinations, and make sure the final printout preserves the approved information. It is tempting to label the whole spreadsheet “verified,” but that hides what was actually checked.
| Check | What it can establish | What remains separate |
|---|---|---|
| Field review | Whether required working fields are present | Whether they describe the right recipient |
| USPS ZIP Code lookup | ZIP Code information for the supplied address | Whether the person or business is there |
| Recipient confirmation | What the recipient says to use | Postal formatting and final print quality |
| Printed sample check | Whether the approved address survives printing | Any subsequent move or delivery issue |
USPS’s lookup tool asks for the street address and includes an apartment or suite field. It explicitly warns that a result does not establish a person’s or company’s presence at the address. Enter complete information, and hold uncertain records for follow-up rather than treating a plausible ZIP Code as approval.
Prepare a review copy
Keep an unchanged copy of the original list. In the working copy, add columns for review status, question, owner, and confirmation date. Use clear states such as “ready,” “needs suite,” and “confirm destination.” This is a suggested office workflow, not a USPS certification process.
Keep ZIP Codes as text in your spreadsheet so a leading zero is not accidentally removed. Inspect imported files after opening them; formatting can change between a customer database, spreadsheet, and label tool. Also keep the original address text beside any proposed correction until it is approved.
Resolve exceptions before printing the batch
Missing suite: A customer record shows a company and building address, but another order contains a suite number. Contact the customer through the existing business channel. Do not guess the unit from a similarly named company.
USPS Publication 28 specifies secondary-unit designators such as APT or STE where applicable. Use the correct known designator and retain the number. If a line is too long, review the complete layout rather than deleting the suite to make it fit.
Two destinations: One record has a street address and another has a PO Box. Ask which address the recipient wants for this mailing. Keep the answer with the review record; the first nonblank field is not a reliable selection rule.
Possible duplicate: Compare recipient, account reference, and mailing purpose before removing a row. Two people sharing a business address may need separate letters. Conversely, a duplicated import may create two identical letters. The address alone does not decide which case you have.
Test the output, not just the spreadsheet
Print representative samples: a long company name, a suite address, and a record with a leading-zero ZIP Code. Compare each sample against the approved record. For window envelopes, use our window-envelope check to inspect insert movement and visibility.
After resolving exceptions, release a dated mailing file and keep later edits separate. Connect the approved count to the postage approval and quantity planning records so the mailing desk is working from the same version.
Commercial mailing is a separate compliance decision
A manual review of ordinary stamped correspondence is not proof that a batch qualifies for commercial postal prices. USPS Business Mail 101 describes address-maintenance options, including CASS-certified processing and NCOALink. Check the applicable requirements with the business mail entry team before claiming a commercial price.
Our bulk stamps versus USPS Marketing Mail guide explains why purchasing a large stamp quantity does not itself establish postal-class eligibility.
Frequently asked questions
Does a ZIP Code match prove occupancy?
No. Confirm the current recipient destination independently when it is uncertain.
Should a missing suite stop the whole mailing?
Hold the unresolved record separately. Release other records only under your organization’s approved process.
Does checking every row once keep the list correct forever?
No. Keep dated confirmations and a process for subsequent changes and returned mail.
Official sources
- USPS ZIP Code Lookup: address search and limitations
- USPS Publication 28: secondary-unit designators
- USPS Business Mail 101: address-list maintenance
PostageGrid is an independent retailer. The workflow recommendations above do not certify a list for USPS commercial pricing.