To understand why some physical places have shorter entries than fictional ones, it's necessary to invoke the First Rule of Wikipedia: more people are qualified to write about pop culture than, say, astrophysics. That's why each episode of Heroes has its own incredibly detailed entry.
On that note, Wikipedia contributors have much more to say about the exploits of an HBO series set in Deadwood than the actual history of the Dakotas.
Here are the word counts for some pairs of Wikipedia entries on places and related terms:
Dachau concentration camp: 3,784
Hogan's Heroes: 5,788
Deadwood, S.D.: 1,216
Deadwood (the TV series): 5,201
Beverly Hills, Calif.: 5,807
Beverly Hills 90210: 6,040
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