MOUNTAIN RIVER BOAT WORKS HIN Decoder
Hull Identification Numbers beginning with MJO were assigned by the US Coast Guard to MOUNTAIN RIVER BOAT WORKS of EIGHTY FOUR, PA. The company is recorded as out of business since 1993 — 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
MJO
Location
EIGHTY FOUR, PA
In business
since 1985
Status
Out of business (1993)
MOUNTAIN RIVER BOAT WORKS hulls (1985–1993) 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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MOUNTAIN RIVER BOAT WORKS HIN FAQ
What does a MOUNTAIN RIVER BOAT WORKS HIN look like?
It starts with the three characters "MJO" — the Manufacturer Identification Code the US Coast Guard assigned to MOUNTAIN RIVER BOAT WORKS — followed by a 5-character hull serial and a 4-character date code, 12 characters total. MOUNTAIN RIVER BOAT WORKS hulls (1985–1993) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is MOUNTAIN RIVER BOAT WORKS still in business?
USCG records list MOUNTAIN RIVER BOAT WORKS as out of business since 1993. 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 MOUNTAIN RIVER BOAT WORKS HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. MOUNTAIN RIVER BOAT WORKS hulls (1985–1993) 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 PA
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "MOUNTAIN RIVER BOAT WORKS HIN Decoder," carwhere.com/hin-decoder/mjo, last verified 2026-06-12.