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Ontario's limit for city classification is 10,000 but several exceptions have been made, most notably Dryden and Temiskaming Shores, which were given city status under an assumption they would eventually reach 10,000. Dryden never did, and Temiskaming Shores now has only 9,900. It's not done automatically, only upon request, which is why Markham was a town for so long and Oakville still is one.

Other designations are just more specific variations of the default, which is Municipality. Most common are Town or Township and Village.