Thanks, Bruno.
Jon apparently is the package maintainer[1], and recently updated the zipcodes information for it[2].
In addition to zcta5.txt, there's an upgrade file[3] for 0.1d to 2.0 that updates location data for zipcodes.
There doesn't appear to be a place in the bugtracker to report or track this, so I want to follow through with this to get it working on a fresh install.
Torben
1. https://openacs.org/projects/openacs/5.0/package_inventory
2. https://openacs.org/forums/message-view?message_id=169142
3. http://cvs.openacs.org/cvs/openacs-4/packages/ref-us-zipcodes/sql/common/upgrade/
