State Requirement Summary

Maryland Boat Registration Number Requirements

Boats registered in Maryland display an MD-prefixed number such as MD 1234 AB. Maryland calls for characters 3 inches high in block characters, reading left to right, contrasting / legible, positioned each side of the forward half / bow. Our lettering is designed to meet the displayed Maryland size and formatting requirements. The state itself issues the validation/expiration decal — we supply the registration-number lettering.

Boat number requirements

Last regulatory review: August 22, 2026

Assigned number example

MD 1234 AB

Minimum character height: 3 inches
Lettering style: Block characters
Contrast: Contrasting / legible
Spacing / separator: Space or hyphen
Reading direction: Left to right
Number location: Each side of the forward half / bow
Validation decal: Within 3 inches of the vessel number; may be in front of, behind, above or below the number
State agency: Maryland Department of Natural Resources

What we sell vs. what the state issues: RegistrationDecals.com supplies the registration-number lettering, designed to meet the displayed Maryland size and formatting requirements. Maryland Department of Natural Resources issues the official validation/expiration decal — and any separate stickers such as aquatic-invasive-species, mussel-awareness, carbon-monoxide or lake-protection stickers, which are not interchangeable with each other.

Design your MD numbers

Starts with the Maryland format (MD 1234 AB). Tap the decal and type your own assigned number exactly as it appears on your certificate of number.

Tap the decal to edit

Decal color

We supply the registration-number lettering, sized to the displayed Maryland requirements. Maryland Department of Natural Resources issues the validation decal.

Maryland placement diagram

Both sides of the hull carry the number. The grey square marks where the state-issued validation decal goes — within 3 inches of the vessel number; may be in front of, behind, above or below the number.

Port side — bow to the left

Starboard side — bow to the right

Height: 3 inches, block characters
Spacing: Space or hyphen
Location: Each side of the forward half / bow
Validation decal: Within 3 inches of the vessel number; may be in front of, behind, above or below the number

Diagram is illustrative. Confirm exact positioning against the instructions issued with your Maryland registration.

Official source

Maryland Department of Natural Resources — Primary state agency source. Last verified August 22, 2026 (source check 2026-08-22).

Maryland DNR — Vessel registration

Registration requirements can change. RegistrationDecals.com summarizes publicly available boating-registration requirements to help boat owners select and display registration numbers. Always compare your registration and decals with the current instructions issued by your state boating or registration agency before applying them to your vessel.

Maryland rules in detail

Assigned number format

Maryland assigns numbers in the pattern MD 1234 AB, using the MD prefix. Maryland has flexible decal orientation within its 3-inch envelope.

Minimum character height

Maryland specifies characters 3 inches high. Measure the character body itself — if the state excludes borders, outlines or shading, decorative trim does not count toward the minimum.

Required lettering style

Block characters, reading left to right. Script, italic and decorative treatments are not what this style describes.

Contrast requirement

Contrasting / legible. In practice that means dark characters on a light hull and light characters on a dark hull, checked in daylight from the side of the vessel.

Spacing and separator

Space or hyphen. Example: MD 1234 AB. Running the groups together with no separation does not match the stated format.

Placement on the hull

Each side of the forward half / bow. No other number on the bow.

Validation decal placement

Within 3 inches of the vessel number; may be in front of, behind, above or below the number. The validation or expiration decal is issued by Maryland Department of Natural Resources — RegistrationDecals.com supplies the registration-number lettering only.

Common mistakes

Ordering the number without the MD prefix or the suffix letters.
Characters shorter than the stated minimum (3 inches) so they fit inside a narrow accent stripe.
Using a script, italic or shadowed style instead of block characters.
Losing the required separation between the groups — space or hyphen.
Placing the state validation decal somewhere other than the position Maryland describes: within 3 inches of the vessel number; may be in front of, behind, above or below the number.

Frequently asked questions

What does a Maryland boat registration number look like?

Maryland numbers follow the pattern MD 1234 AB, using the MD prefix, a numeral group, and suffix letters.

How tall do Maryland boat registration numbers have to be?

3 inches, measured on the character itself, in block characters.

What lettering style does Maryland require?

Block characters, reading left to right, and contrasting / legible.

How much space goes between the letters and numbers in Maryland?

Space or hyphen. Example: MD 1234 AB.

Where do the numbers go on the boat in Maryland?

Each side of the forward half / bow. No other number on the bow.

Where does the Maryland validation decal go?

Within 3 inches of the vessel number; may be in front of, behind, above or below the number. The decal itself is issued by Maryland Department of Natural Resources; we supply the registration-number lettering.

Who regulates boat registration numbers in Maryland?

Maryland Department of Natural Resources. Confirm the current instructions issued with your registration before applying anything to your hull. Last regulatory review: August 22, 2026.

Can I order Maryland boat registration numbers online?

Yes. Enter your assigned MD number in the designer on this page, pick a color that contrasts with your hull, and we cut a matched port-and-starboard pair and ship it to the 48 contiguous states.

Do I need two sets of Maryland registration numbers?

You need the number displayed on both sides of the vessel — each side of the forward half / bow — so every order ships as a matched port-and-starboard pair.

Related guides

Ready to design your MD numbers?

Our designer starts with plain block characters and proper group spacing, so you can see exactly how MD 1234 AB will read on your hull before you order.

Source: Maryland Department of Natural Resources · Primary state agency source · Official registration source plus state boating education cross-check · Source last checked 2026-08-22.