NORTHPORT MARINE LLC HIN Decoder
Hull Identification Numbers beginning with MRR were assigned by the US Coast Guard to NORTHPORT MARINE LLC of GILLETT, WI. The builder is listed in the USCG MIC database. Enter the full 12-character HIN below for build date, model year, and serial — free, no account.
MIC
MRR
Location
GILLETT, WI
In business
since 1972
Status
Listed active in USCG records
NORTHPORT MARINE LLC built hulls across both HIN eras (1972–present): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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NORTHPORT MARINE LLC HIN FAQ
What does a NORTHPORT MARINE LLC HIN look like?
It starts with the three characters "MRR" — the Manufacturer Identification Code the US Coast Guard assigned to NORTHPORT MARINE LLC — followed by a 5-character hull serial and a 4-character date code, 12 characters total. NORTHPORT MARINE LLC built hulls across both HIN eras (1972–present): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three.
Is NORTHPORT MARINE LLC still in business?
USCG records list NORTHPORT MARINE LLC of GILLETT, WI in the MIC database (registered 1972).
How do I decode the year on a NORTHPORT MARINE LLC HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. NORTHPORT MARINE LLC built hulls across both HIN eras (1972–present): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Other builders in WI
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "NORTHPORT MARINE LLC HIN Decoder," carwhere.com/hin-decoder/mrr, last verified 2026-06-12.