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I don't really know, but I believe sectors were just three-digit numbers ranging from 001 (Sol sector) up. They were also named after prominent star systems in the sectors.

There were some five-digit sectors (a couple in the TNG episode "The Wounded", for starters) but I have not heard one way or the other if they were based on ZIP codes. 31dot 20:06, April 28, 2012 (UTC)

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