State Requirement Summary

Montana Boat Registration Number Requirements

Boats registered in Montana display an MT-prefixed number such as MT 1121 AB. Montana calls for characters 3 inches high in block characters, reading left to right, sharp contrast with background, positioned both sides of the bow, as high above the waterline as practical. Our lettering is designed to meet the displayed Montana 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

MT 1121 AB

Minimum character height: 3 inches
Lettering style: Block characters
Contrast: Sharp contrast with background
Spacing / separator: Space or hyphen
Reading direction: Left to right
Number location: Both sides of the bow, as high above the waterline as practical
Validation decal: Montana's current permanent registration decal is placed on the left forward half, 3 inches behind the identifying numbers where applicable
State agency: Montana Motor Vehicle Division / Montana Fish, Wildlife & Parks

What we sell vs. what the state issues: RegistrationDecals.com supplies the registration-number lettering, designed to meet the displayed Montana size and formatting requirements. Montana Motor Vehicle Division / Montana Fish, Wildlife & Parks 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 MT numbers

Starts with the Montana format (MT 1121 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 Montana requirements. Montana Motor Vehicle Division / Montana Fish, Wildlife & Parks issues the validation decal.

Montana placement diagram

Both sides of the hull carry the number. The grey square marks where the state-issued validation decal goes — montana's current permanent registration decal is placed on the left forward half, 3 inches behind the identifying numbers where applicable.

Port side — bow to the left

Starboard side — bow to the right

Height: 3 inches, block characters
Spacing: Space or hyphen
Location: Both sides of the bow, as high above the waterline as practical
Validation decal: Montana's current permanent registration decal is placed on the left forward half, 3 inches behind the identifying numbers where applicable

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

Official source

Montana Motor Vehicle Division / Montana Fish, Wildlife & Parks — Primary state agency source. Last verified August 22, 2026 (source check 2026-08-22).

Montana Fish, Wildlife & Parks — Boating

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.

Montana rules in detail

Assigned number format

Montana assigns numbers in the pattern MT 1121 AB, using the MT prefix. Montana uses permanent registration — confirm current registration- vs validation-sticker terminology before applying.

Minimum character height

Montana 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

Sharp contrast with background. 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: MT 1121 AB. Running the groups together with no separation does not match the stated format.

Placement on the hull

Both sides of the bow, as high above the waterline as practical. Assigned registration number only in the required area.

Validation decal placement

Montana's current permanent registration decal is placed on the left forward half, 3 inches behind the identifying numbers where applicable. The validation or expiration decal is issued by Montana Motor Vehicle Division / Montana Fish, Wildlife & Parks — RegistrationDecals.com supplies the registration-number lettering only.

Common mistakes

Ordering the number without the MT 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 Montana describes: montana's current permanent registration decal is placed on the left forward half, 3 inches behind the identifying numbers where applicable.

Frequently asked questions

What does a Montana boat registration number look like?

Montana numbers follow the pattern MT 1121 AB, using the MT prefix, a numeral group, and suffix letters.

How tall do Montana boat registration numbers have to be?

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

What lettering style does Montana require?

Block characters, reading left to right, and sharp contrast with background.

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

Space or hyphen. Example: MT 1121 AB.

Where do the numbers go on the boat in Montana?

Both sides of the bow, as high above the waterline as practical. Assigned registration number only in the required area.

Where does the Montana validation decal go?

Montana's current permanent registration decal is placed on the left forward half, 3 inches behind the identifying numbers where applicable. The decal itself is issued by Montana Motor Vehicle Division / Montana Fish, Wildlife & Parks; we supply the registration-number lettering.

Who regulates boat registration numbers in Montana?

Montana Motor Vehicle Division / Montana Fish, Wildlife & Parks. Confirm the current instructions issued with your registration before applying anything to your hull. Last regulatory review: August 22, 2026.

Can I order Montana boat registration numbers online?

Yes. Enter your assigned MT 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 Montana registration numbers?

You need the number displayed on both sides of the vessel — both sides of the bow, as high above the waterline as practical — so every order ships as a matched port-and-starboard pair.

Related guides

Ready to design your MT numbers?

Our designer starts with plain block characters and proper group spacing, so you can see exactly how MT 1121 AB will read on your hull before you order.

Source: Montana Motor Vehicle Division / Montana Fish, Wildlife & Parks · Primary state agency source · Primary for the current permanent-registration decal location · Source last checked 2026-08-22.