Canadian · Validation
MPAC roll number checker.
Check that an Ontario property assessment roll number has the real 19-digit shape, and see the municipality code it starts with.
Important, up front: MPAC has never published the full digit-by-digit segment breakdown of the roll number anywhere this tool could confirm in readable text. This tool checks the confirmed parts — 19 digits, starting with a municipality code — and does not guess at the remaining segments. No checksum exists.
Inputs
Result
Enter a roll number and press Check.
What's confirmed about the roll number
Every property in Ontario that MPAC assesses gets a 19-digit roll number. County of Brant's own property-tax page tells taxpayers paying by online or telephone banking: "you will need your 19 digit roll number, starting with the numbers 2920" — 2920 being the County of Brant's own municipal code. That's the specific, citable confirmation this tool checks against: the roll number's total length, and that it begins with a code identifying the municipality.
MPAC's own site references the roll number repeatedly — for example, on "Reading your property assessment notice," where it's listed among the information every Property Assessment Notice includes, alongside your Access Key for logging in to AboutMyProperty™.
What this tool does not claim
Beyond the 19-digit length and the leading municipality code, MPAC does not appear to publish the full digit-by-digit segment breakdown (exact widths for ward, roll and parcel/sub-number portions) anywhere in publicly readable text this session could confirm. Rather than guess at those widths — the same trap as inventing a checksum — this tool deliberately checks only what's confirmed above, the same way the Business Number validator on this site declines to invent CRA program identifiers it couldn't verify.
No checksum exists on the roll number itself
Like a CRA Business Number, a roll number is an assigned identifier, not a self-checking one. This tool can tell you a roll number is the right length and shape; it cannot tell you whether a specific number was ever actually assigned to a real property — only MPAC's AboutMyProperty™ service or your municipality's tax department can do that.
Format check only — not an MPAC lookup
This tool checks shape entirely in your browser. It does not query MPAC or any municipality, and a shape-valid result is not proof the number belongs to a real property. Nothing you type is transmitted, stored, or logged.