An archive of every published match official for the USL Championship, USL League One, USL Super League and USL Cup from 2013 through 2026: 1,736 officials across 7,314 matches, joined to per-match disciplinary records (cautions, sendings-off, penalties and mass confrontations).
Assignments are scraped from the Professional Referee Organization's published crew lists; disciplinary data comes from Transfermarkt match reports, and from FotMob for the Super League, which Transfermarkt does not cover. The interactive timeline requires JavaScript.