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Dont know. Cant help u. I know only that in the early days, the USPS set up a lot of zip codes, the realized that many were out of the same post office, which made no sense, so they went to the 4 digit secondary codes, and eliminated the primaries. AKA (making up numbers) 94995 and 94996 became 94995-3334 and 94995-3335
Ancient history.
Curious as to why it is important to you. The change happened way back in the 60's IIRC
If youre trying to find "predominately black" or "predominately Chinese" neighborhoods then zip code wont really help you as there can be a lot of crossing over between codes in the same neighborhood.
Location: East of Seattle since 1992, 615' Elevation, Zone 8b - originally from SF Bay Area
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There are several places where you can get demographics by zip, but it will cost you. The data you are looking for is not readily available because it's so valuable to companies as a marketing tool, and to politicians as a campaign tool. They use it for targeting with their fliers, robocalls, and telemarketing. This one is free but only provides one at a time for the zip code entered, and it's not very complete. Our zip code is 12 years old but "not found." I have never seen or heard of a place that has it historically by zip, only by city or state.
Enter the city, click on "Go", then click on "Census 2000 General Demographic Characteristics"
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