Topic 02 of 07
Address verification
Confirm that an address exists in authoritative reference data and can typically receive mail or deliveries.
Why it matters
Verification reduces returned mail, failed deliveries, and fraud risk by matching against postal or commercial reference files—not just checking that the text looks right.
Validation vs. verification
Validation is about form and completeness. Verification is about existence and deliverability against a trusted source.
Think of validation as grammar, and verification as looking the place up in an atlas maintained by postal authorities or geospatial data vendors.
How matching works
Engines normalize the input, then search reference datasets for the closest deliverable match. Results often include confidence scores, corrected components, and residual codes explaining what changed.
Partial matches are common: a street exists but the unit does not, or the ZIP is wrong but the city and street align. Your business rules decide whether to accept, correct, or flag for review.
Operational tips
Capture verification results (timestamp, match code, corrected address) so you can audit changes and re-process when reference data updates.
Offer users a chance to confirm suggested corrections in interactive forms—silent overwrites can frustrate people who know their rural route or new development better than the file.
Related topics
- Address validation→
Check whether an address is structurally complete and plausible before you treat it as deliverable.
- CASS certification→
USPS Coding Accuracy Support System—software certification and a process that improves ZIP+4 and delivery-point accuracy for US mail.
- NCOA — National Change of Address→
USPS-licensed process that updates addresses when people and businesses file official change-of-address moves.
- Geocoding→
Turn an address into coordinates (and often a precision level) so maps, routing, and spatial analysis can use it.