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Filing a USPS change of address puts your name and new address into the National Change of Address database (NCOA), which licensed mailers, banks, insurers, and catalog companies, check before their bulk mailings. That is why bills and even junk mail start finding your new home within weeks. Your forwarding address is not public, but any company that already had your old address can usually get the new one.
NCOA is the USPS-maintained record of moves, built from change-of-address forms. It exists for a practical reason: USPS gives discounted postage to bulk mailers that clean their lists, and running addresses through NCOA before a mailing is how mailers qualify. So every bank statement run, insurance renewal, and catalog drop typically goes through an NCOA check first, and your new address gets substituted automatically. You never had to call the catalog company; their mailer did the lookup for them.
Not the general public. Access to NCOA goes through licensed service providers, and the rule is that a mailer can only receive updated addresses for names already on its own list. In plain terms: a company that was already mailing you can follow you to the new address, but a stranger cannot buy your new address from the database. That is the line USPS draws between list hygiene and a public directory.
NCOA is the big one, but it is not the only path. A few others worth knowing:
| Source | How they get it | What you can do |
|---|---|---|
| Your bank or card issuer | You update your address with them, and they share updates across their products and partners | Ask what they share and with whom when you update |
| Credit bureaus | Lenders report your new address when you open or update accounts | Freeze or monitor reports if you are privacy-conscious |
| Data brokers | Public records, subscriptions, and purchase data get stitched together | Use broker opt-out services; results vary |
| Friends, family, and the mail itself | Someone gives it out, or mail marked with your name keeps arriving | Tell people what not to share |
Yes, and that is the annoying flip side. Any mailer already sending to your old address, including the catalog you bought from once three years ago, can refresh its list through NCOA and keep mailing you. Filing a change of address is great for not missing bills, and it also ports your junk mail. If you want less of it, the DMAchoice opt-out and the individual "remove me" requests still matter; NCOA only moves mail, it does not filter it.
Canada Post runs its own mail forwarding service rather than a US-style NCOA database, but the effect is similar: mailers that use Canada Post address-correction services can get updated addresses for their existing customers. If you move within Canada, file forwarding with Canada Post and then update your address directly with banks, insurers, and government accounts anyway, since forwarding is temporary and some mail, like government cheques, may not forward the way you expect.
Your move data stays in NCOA for a limited window, roughly a year and a half, after which mailers that check the database will stop seeing your move. USPS mail forwarding itself also expires, and when it does, mail to your old address starts being returned to sender instead of forwarded. The practical takeaway: use the forwarding period to update everyone important directly, because the automatic trail runs out.
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