NCOA: Processing Address Changes at Scale
40 million Americans move each year. NCOA (National Change of Address) processing updates mailing lists to keep them current.
## The Moving Problem
Every year, roughly **40 million Americans** change their address. For businesses that maintain mailing lists, this means databases decay at a rate of about **12% per year** — and mailing to old addresses wastes money.
## What Is NCOA?
NCOA — National Change of Address — is a USPS database that contains the forwarding addresses filed by individuals and families when they move. The database covers moves from the past **48 months**.
## How NCOA Processing Works
| Step | Description |
|------|------------|
| Submit list | Mailer sends address list to licensed NCOA processor |
| Match | Processor compares against NCOA database |
| Update | Moved addresses replaced with new addresses |
| Flag | Unmatched addresses flagged for review |
| Report | Summary of moves, no-matches, and errors |
## NCOA Variants
| Product | Scope | Licensing |
|---------|-------|----------|
| NCOALink | Full NCOA, batch processing | Licensed to ~400 processors |
| ACS (Address Change Service) | Per-mailpiece, real-time | Available to all mailers |
| ANKLink | 48-month+ moves | Supplementary |
## USPS Requirements
The USPS requires NCOA processing for certain mailings:
- **First-Class Presort** — NCOA within 95 days before mailing
- **Marketing Mail** — NCOA within 95 days before mailing
- **Standard Mail** — NCOA optional but recommended
Failure to meet the 95-day requirement can result in loss of postal discounts.
## Privacy Considerations
NCOA data is tightly controlled:
- Only licensed processors can access the full database
- Individual lookups are not available to the public
- Data is encrypted in transit and at rest
- Processors must sign USPS privacy agreements
- The USPS does not share NCOA data with non-postal entities
## Impact
Regular NCOA processing typically updates 8-12% of a mailing list. For a list of 100,000 addresses, that's 8,000-12,000 corrections — each one preventing wasted postage and improving customer communication.