From Tax Rates Wiki
ZIP codes are often used as a way to determine sales tax rates, but this is not their purpose, and tax jurisdictions do not always align neatly with the boundaries of ZIP codes. Geolocation is a better way to find accurate sales tax rates.
ZIP codes were introduced in 1963 as a new way for the United States Post Office (USPS) to accurately determine address locations.
Other new and exciting things from 1963:
- Chubby Checker
- lava lamps
- push-button desktop phones
- audio cassette tapes.
In 1983, the USPS extended ZIP Codes with the +4 system, moving to optional nine digit codes, adding geographical subsections to the original ZIP Codes.
Other new and exciting things from 1983:
- Lotus 1-2-3, the first popular spreadsheet software
- The Final Episode of MASH