To find your boat registration number, look first at the forward half of the hull on both sides of the bow, where regulations require it to be displayed. If it’s worn off or painted over, pull out your certificate of number (the registration card issued when you registered the boat), your title, or your bill of sale. When the paperwork is missing too, your state boating agency can look up the record, and for federally documented vessels the U.S. Coast Guard maintains a free online database.
Check the Bow First
Federal rules require the number to be painted on or permanently attached to each side of the forward half of the vessel, in plain vertical block letters and numerals at least three inches tall, in a color that contrasts sharply with the hull.1eCFR. 33 CFR 173.27 – Numbers: Display; Size; Color The format is standard across states: a two-letter state code, a group of up to four numerals, and a final group of up to two letters, separated by spaces or hyphens. Something like “FL 1234 AB” or “TX-4821-GH.”
Within six inches of the number you should see a validation sticker, the small decal issued with your certificate that shows the registration is current.2eCFR. 33 CFR 173.35 – Coast Guard Validation Sticker No other numbers or lettering are supposed to appear on either side of the bow, so if anything is legible up there, it’s the registration number.
Look at Your Paperwork
The most reliable source off the boat is the certificate of number itself. Federal law requires you to keep it on board whenever the vessel is in use, in either hard copy or digital form.3eCFR. 33 CFR 173.21 – Certificate of Number Required The card lists the registration number, the Hull Identification Number, the owner’s name, and basic vessel details. Check the glove box, a waterproof pouch on board, or wherever you store boat paperwork at home.
If the certificate is gone, other documents carry the number. Your boat’s title, if your state issues one, records both the registration number and the HIN. A bill of sale from your purchase almost always includes them. Recent buyers should dig through closing paperwork before calling anyone. Insurance policies sometimes list the registration number as well, though insurers more often identify boats by the HIN.
Use the Hull Identification Number as a Backup
The HIN is a separate 12-character alphanumeric code assigned by the manufacturer and stamped or bonded to the starboard side of the transom. A secondary HIN is placed in a hidden interior location to deter theft.4eCFR. 33 CFR 181.25 – Hull Identification Number Format Even if the registration number is nowhere to be found, the HIN is unique to your boat and lets any state agency or the Coast Guard pull the full record. Write it down before you make any calls.
Try an Online Lookup
Many states run online databases where you can search by HIN, owner name, or partial registration number. Coverage varies widely. Some states offer full self-service portals; others only let you order duplicate documents online. Start with the agency in your state that handles boating: the fish and wildlife agency, the department of natural resources, or the DMV.
If your boat is federally documented, search the Coast Guard’s PSIX (Port State Information Exchange) database at cgmix.uscg.mil. You can search by vessel name, HIN, official number, or call sign, and the records come from the National Vessel Documentation Center. No account is required and the search is free.
Contact the Agency That Issued the Registration
When online tools come up short, call or visit the issuing agency. In some states that’s the DMV; in others it’s the Department of Natural Resources, Fish and Wildlife, or a dedicated marine division. For documented vessels, contact the National Vessel Documentation Center.
Bring identifying details. The HIN is the single most useful thing you can provide, because it stays with the boat through every sale and re-registration. Your full legal name, address on file, and the approximate year you registered will help narrow the search. A replacement certificate of number or replacement validation sticker usually carries a modest fee, somewhere from a few dollars up to about $25 depending on the state.
A Note on Documented Vessels
Boats measuring at least five net tons are eligible for federal documentation through the Coast Guard instead of state registration.5Office of the Law Revision Counsel. 46 USC 12103 – General Eligibility Requirements A documented vessel receives an official number, which must be marked in block Arabic numerals at least three inches tall on a clearly visible interior structural part of the hull, preceded by “NO.” and permanently affixed.6eCFR. 46 CFR 67.121 – Official Number Marking Requirement So if you can’t find a state-style number on the bow of a larger boat, check inside the hull for a number preceded by “NO.”
Most states also require documented vessels to register at the state level, even though the federal numbering rules exempt them from displaying a state registration number on the bow. That means a documented boat may carry both an official number inside and a state registration number in your records, or only the official number, depending on the state. Confirm with your state boating agency which applies to you.