If you look at repeat cities the East has New York 4, Philadelphia 3, Boston 4, DC 2, and Baltimore 2 most in easy driving distance of each other.
One note, however, about repeat cities. Many of them haven't really been repeaters in the "modern" era of Worldcons (which I'll arbitrarily claim are those large enough to require a convention center, so 2,000+ participants). For instance, in the East: New York has not had a Worldcon in the modern era (the last was 40 years ago); and Philly has had only one in the modern era (the first two were in 1947 and 1953).
(From my point of view, though, it's really sad that there isn't much of a fannish presence in Cleveland anymore. I was 9 in 1966, when the last Cleveland Worldcon was held. And I never heard of fandom until I moved to Boston in 1984.)
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One note, however, about repeat cities. Many of them haven't really been repeaters in the "modern" era of Worldcons (which I'll arbitrarily claim are those large enough to require a convention center, so 2,000+ participants). For instance, in the East: New York has not had a Worldcon in the modern era (the last was 40 years ago); and Philly has had only one in the modern era (the first two were in 1947 and 1953).
(From my point of view, though, it's really sad that there isn't much of a fannish presence in Cleveland anymore. I was 9 in 1966, when the last Cleveland Worldcon was held. And I never heard of fandom until I moved to Boston in 1984.)