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Find the program's own mailing address, not the department's head office, and put every reference number the agency gave you in the first paragraph. Send it by Registered Mail so you hold proof of delivery, and keep a copy of everything, since agencies decide cases from the file, not from memory.
Canadian federal departments are large, and their head office address is almost never where your letter should go. Each program, a tax office, a benefits program, an immigration case processing centre, runs its own mail intake, often in a different city from headquarters. The program's own web page, its forms, or the instruction guide for the application you are writing about will list a mailing address or a PO box. Use that one, exactly as printed, including any attention line or program code. If a form says to write a case or client number on the envelope, do it: that line is how the mail room routes your letter without opening it.
The same rule holds at the provincial level. A letter to a provincial ministry should go to the branch or program office handling your file, such as a driver licensing office, a health card office, or a tribunal registry, rather than the ministry's main Toronto, Edmonton, or Victoria address. Municipal letters follow the same logic: address the specific department, like planning, tax, or bylaw, at the city hall address listed for that department.
| Level | Address to use | Common mistake |
|---|---|---|
| Federal program | The program's case processing centre or PO box | Mailing to the department's Ottawa headquarters |
| Provincial program | The branch or regional office handling your file | Mailing to the ministry's main office |
| Municipal department | The department's address at city hall | Addressing it to the mayor or council in general |
| Tribunal or board | The registry address in the tribunal's rules | Mailing to a hearing location instead of the registry |
Put your full legal name, mailing address, and phone number at the top, then every identifier the agency has given you: client number, case number, Social Insurance Number only if the agency specifically asks for it on paper, and the reference number from any previous letter they sent you. State your request in the first paragraph, then the facts in order, then what you want done. Agency staff process high volumes, and a letter that opens with its request and its file numbers gets routed correctly on the first read.
Attach copies of supporting documents, never originals. If the agency needs an original, it will ask, and you will still have it. Number your enclosures at the end of the letter ("Enclosures: 1. Copy of notice dated...") so the reader can check that nothing is missing, and keep an identical copy of the whole package for yourself.
Government deadlines are often strict, and the date your letter was received can decide whether a filing counts as on time. Registered Mail gives you a counter receipt, tracking, and a signature on delivery, which together prove both the sending date and the receipt date. That proof is worth the extra cost whenever the letter carries a deadline, an appeal, a payment, or a formal request. LetterAgent can mail to Canadian addresses, including government offices, with the registered option: describe the letter to your AI assistant, approve the exact quoted price, and it is printed and mailed.
Federal institutions in Canada operate in both official languages, and you may write to a federal agency in English or French. Provincial and municipal offices vary: Quebec's administration works in French, while other provinces generally accept English, with French-language services available in designated areas. If you are writing about a Quebec matter, a French letter, or at least a French subject line, can speed things along. When in doubt, check the agency's language page before you write.
Ready to mail it? Send your letter with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is printed and mailed.
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