What I make of it
API Evangelist holds this classification in full — 996 rows, 978 of them 6-digit, 2022 vintage (513210 and 516210 present, the 2017 codes 511210 and 515120 absent), with SBA size standards attached to 454 of them. It is the SBA size-standards table rather than the Census structure: Census publishes 1,012 national industries for NAICS US 2022, so the held copy runs 34 codes short of the classification itself. It was published at vocabularies.apievangelist.com until that section was retired on 2026-08-17.