Assigned number format
Indiana assigns numbers in the pattern IN 1234 AB, using the IN prefix. Indiana uses a clearly specified right-of-number decal rule.
State Requirement Summary
Indiana Boat Registration Number Requirements
Boats registered in Indiana display an IN-prefixed number such as IN 1234 AB. Indiana calls for characters 3 inches high in block / legible characters, reading left to right, contrasting / clearly visible, positioned each side of the bow / forward half. Our lettering is designed to meet the displayed Indiana 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
IN 1234 AB
- Minimum character height
- 3 inches
- Lettering style
- Block / legible characters
- Contrast
- Contrasting / clearly visible
- Spacing / separator
- Space or hyphen
- Reading direction
- Left to right
- Number location
- Each side of the bow / forward half
- Validation decal
- Within 3 inches to the RIGHT of the registration number on each side of the bow
- State agency
- Indiana Bureau of Motor Vehicles
What we sell vs. what the state issues: RegistrationDecals.com supplies the registration-number lettering, designed to meet the displayed Indiana size and formatting requirements. Indiana Bureau of Motor Vehicles 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 IN numbers
Starts with the Indiana format (IN 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 Indiana requirements. Indiana Bureau of Motor Vehicles issues the validation decal.
Indiana placement diagram
Both sides of the hull carry the number. The grey square marks where the state-issued validation decal goes — within 3 inches to the right of the registration number on each side of the bow.
- Height: 3 inches, block / legible characters
- Spacing: Space or hyphen
- Location: Each side of the bow / forward half
- Validation decal: Within 3 inches to the RIGHT of the registration number on each side of the bow
Diagram is illustrative. Confirm exact positioning against the instructions issued with your Indiana registration.
Official source
Indiana Bureau of Motor Vehicles — Primary state agency source. Last verified August 22, 2026 (source check 2026-08-22).
Indiana BMV — Watercraft titles and registrationsRegistration 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.
Indiana rules in detail
Minimum character height
Indiana 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 / legible characters, reading left to right. Script, italic and decorative treatments are not what this style describes.
Contrast requirement
Contrasting / clearly visible. 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: IN 1234 AB. Running the groups together with no separation does not match the stated format.
Placement on the hull
Each side of the bow / forward half. Must remain legible and clearly visible.
Validation decal placement
Within 3 inches to the RIGHT of the registration number on each side of the bow. The validation or expiration decal is issued by Indiana Bureau of Motor Vehicles — RegistrationDecals.com supplies the registration-number lettering only.
Common mistakes
- Ordering the number without the IN 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 / legible characters.
- Losing the required separation between the groups — space or hyphen.
- Placing the state validation decal somewhere other than the position Indiana describes: within 3 inches to the RIGHT of the registration number on each side of the bow.
Frequently asked questions
What does a Indiana boat registration number look like?
Indiana numbers follow the pattern IN 1234 AB, using the IN prefix, a numeral group, and suffix letters.
How tall do Indiana boat registration numbers have to be?
3 inches, measured on the character itself, in block / legible characters.
What lettering style does Indiana require?
Block / legible characters, reading left to right, and contrasting / clearly visible.
How much space goes between the letters and numbers in Indiana?
Space or hyphen. Example: IN 1234 AB.
Where do the numbers go on the boat in Indiana?
Each side of the bow / forward half. Must remain legible and clearly visible.
Where does the Indiana validation decal go?
Within 3 inches to the RIGHT of the registration number on each side of the bow. The decal itself is issued by Indiana Bureau of Motor Vehicles; we supply the registration-number lettering.
Who regulates boat registration numbers in Indiana?
Indiana Bureau of Motor Vehicles. Confirm the current instructions issued with your registration before applying anything to your hull. Last regulatory review: August 22, 2026.
Can I order Indiana boat registration numbers online?
Yes. Enter your assigned IN 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 Indiana registration numbers?
You need the number displayed on both sides of the vessel — each side of the bow / forward half — so every order ships as a matched port-and-starboard pair.
Related guides
Ready to design your IN numbers?
Our designer starts with plain block characters and proper group spacing, so you can see exactly how IN 1234 AB will read on your hull before you order.
Source: Indiana Bureau of Motor Vehicles · Primary state agency source · Primary · Source last checked 2026-08-22.
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.