[OSM-dev] determining the boundaries of cities?

[John Sturdy]

Official city boundaries can be very different from the common-sense
boundaries; for example, only about half the population of the
built-up area of Limerick is within the official city boundary (most
of the rest of it is in County Limerick, and some of it is in County
Clare).

And then of course there's the City of London (little over 1 square
mile, in the 607 square miles of the London conurbation)!

__John