Ontario Address Generator

ON — province. Postal district K, L, M, N, P.

Ontario is the only province where one province code maps to five postal district letters, which makes it the widest single-province test surface in Canada.

Postal districts

K — Eastern Ontario, including Ottawa and Kingston.
L — Central Ontario and the Golden Horseshoe — Mississauga, Hamilton.
M — Toronto proper. A single city with a postal district to itself.
N — Southwestern Ontario — London, Windsor.
P — Northern Ontario — Sudbury, Thunder Bay.

A worked ON postal code: P4P 4B8.

How addresses in Ontario are written

Jonas Boucher
882 Prairie Drive
Thunder Bay ON  P4P 4B8
Canada

JONAS BOUCHER
882 PRAIRIE DR
THUNDER BAY ON  P4P 4B8
CANADA

What makes Ontario different

One province, five first letters

A surprising amount of address code assumes a province has one postal prefix, because twelve of the thirteen regions behave that way. Ontario does not. Any test that asserts "every Ontario postal code starts with the same letter", or any lookup keyed on a single prefix per province, passes everywhere else and fails here. Generating a batch of Ontario records is the cheapest way to find that assumption in your code.

Toronto has its own district

M covers Toronto and nothing else, so a record in M is always a Toronto record. That makes it useful for testing city-level routing or regional pricing rules without needing to match on the city name, which is far more fragile than matching on a postal district.

The province with the most neighbours in a dropdown

Ontario sorts near the middle alphabetically and near the top by population, so it is a common default in a province selector. If your form pre-selects it, generate records for other regions too — a bug in the province field is easy to miss when the default happens to be correct.

What developers use ON records for

Break a single-prefix province lookup — Generate 50 Ontario records and assert your province-from-postal-code function handles all five district letters. A hard-coded map with one entry per province returns the wrong answer for four of them.
Test district-based routing without city-name matching — Use the M district as a Toronto proxy for delivery-zone or tax-region logic, and confirm the same rule does not fire for K, L, N or P records.
Seed a multi-region staging database from one province — Ontario alone gives you five distinct postal prefixes, so a staging dataset drawn from a single province still exercises prefix-partitioned storage or sharding.
Check sort order on mixed prefixes — Postal codes are strings. Sorting K, L, M, N and P records together surfaces any code that has coerced a postal code to a number or stripped its space before comparing.

Ontario questions

What postal codes does Ontario use?

Ontario uses five postal district letters: K for eastern Ontario, L for the Golden Horseshoe, M for Toronto, N for southwestern Ontario and P for the north. Every generated Ontario postal code here starts with one of those five.

Can I generate only Toronto addresses?

Yes. Select Toronto in the city filter, and every record returned uses the M district. You can also do this through the API with city=toronto.

Are these real Ontario addresses?

No. The municipality and its postal district letter are real, so records are internally consistent and pass validation. The civic number, street, recipient and the rest of the postal code are generated. Nothing produced here is a deliverable address or belongs to anyone.

Why do two Ontario records have different first letters?

Because Ontario genuinely spans five postal districts. If that breaks something downstream, that is the bug this page is most useful for finding.

Every record is synthetic, generated for development, QA, testing, demos and staging. These records do not represent real people, and the addresses are not verified deliverable addresses.