Just noticed this in data.census.gov.
The Census Bureau does not release ACS data at the ZIP Code level, but instead for ZIP Code Tabulation Areas (ZCTAs), which are generalized representations of U.S. Postal Service ZIP Code service areas…
It may be a little bit out of date, but I wrote this blog post about the difference a few years ago: www.policymap.com/.../what-are-zip-code-tabulation-areas
Thanks. I fogort that other datasets are within this portal such as CBP. And thx again for reminder that ZCTA and USPS Zips are not always 1:1.