We hardly ever see anything smaller than 200 amp services here, in fact I can't even remember the last time that I saw a new 100 amp service except one that was put in to power a roadside sign. There just doesn't seem to be a cost justification, not to mention the fact that our POCOs charge the same connection fee regardless.
Of course, services for traffic signals and CATV power supplies are different.
Our most predominant POCO, Dominion, actually provides the meter bases and I don't they don't even offer 100 amp versions for underground services. We're getting 200 amps at the meter whether it is needed or not.
Granted, electric heat, hot water and ranges are quite common here.
