Thread: FREE/BARGAIN — Science Fiction & Fantasy
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Old 02-26-2023, 03:22 PM   #6793
ratinox
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Quote:
Originally Posted by theducks View Post
US Zip codes can have 3 parts

Part 1 is the Post office (most place this a single city, but not always)
Part 2 is the Carrier Route (also used to presort mass mailings to get a discount)
Part 3 is the fine level sort (eg last 2 digits of a house #) I don't see this very often
I suspect Part 2 (called +4) is enough to determine Residential vs Commercial district.
https://faq.usps.com/s/article/ZIP-Code-The-Basics

A full ZIP+4 does not necessarily identify a business address, only when the business has specifically requested a unique ZIP+4.
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