ST JOHN BOATWORKS INC HIN Decoder
Hull Identification Numbers beginning with JHG were assigned by the US Coast Guard to ST JOHN BOATWORKS INC of MIAMI, FL. The company is recorded as out of business since 1997 — common for older hulls, and useful to know when hunting parts or records. Enter the full 12-character HIN below for build date, model year, and serial — free, no account.
MIC
JHG
Location
MIAMI, FL
In business
since 1987
Status
Out of business (1997)
ST JOHN BOATWORKS INC hulls (1987–1997) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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ST JOHN BOATWORKS INC HIN FAQ
What does a ST JOHN BOATWORKS INC HIN look like?
It starts with the three characters "JHG" — the Manufacturer Identification Code the US Coast Guard assigned to ST JOHN BOATWORKS INC — followed by a 5-character hull serial and a 4-character date code, 12 characters total. ST JOHN BOATWORKS INC hulls (1987–1997) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is ST JOHN BOATWORKS INC still in business?
USCG records list ST JOHN BOATWORKS INC as out of business since 1997. That's common for older hulls — the HIN still decodes normally, and the out-of-business date helps date the boat and guides parts-hunting toward salvage and owner groups rather than a dealer network.
How do I decode the year on a ST JOHN BOATWORKS INC HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. ST JOHN BOATWORKS INC hulls (1987–1997) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Other builders in FL
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "ST JOHN BOATWORKS INC HIN Decoder," carwhere.com/hin-decoder/jhg, last verified 2026-06-12.