Federal Display Standard
The U.S. Coast Guard establishes the baseline display rules that all states follow. Under 33 CFR 173.27, registration numbers must be:
- Displayed on both sides of the forward half of the vessel (bow)
- Read from left to right
- Block letters at least 3 inches high
- A color contrasting with the hull
- Separated by hyphens or spaces between the letter-number groups (e.g., FL 1234 AB or FL-1234-AB)
- No other numbers displayed on the bow that could be confused with the registration number
Registration Number Format
All state-issued registration numbers follow the same format:
XX 1234 YY
Where:
- XX — Two-letter state abbreviation (e.g., FL, TX, CA)
- 1234 — Up to four digits (some states use fewer)
- YY — Two-letter suffix
Examples
- FL 1234 AB — Florida
- TX 5678 CD — Texas
- CA 9012 EF — California
- MI 3456 GH — Michigan
Size and Placement Requirements
| Requirement | Standard |
|---|---|
| Minimum letter height | 3 inches (block letters) |
| Font style | Block letters, no script or italic |
| Color | Must contrast with hull color |
| Location | Forward half of vessel, both sides |
| Orientation | Horizontal, reading left to right |
| Visibility | Must be clearly visible and readable |
Validation Stickers/Decals
In addition to the registration number, most states require a validation sticker or decal to be placed:
- Within 6 inches of the registration number
- Usually on the port (left) side, after the registration number
- Some states require stickers on both sides
Color Contrast Guidelines
The registration number must be a contrasting color to the hull. Here are recommended combinations:
| Hull Color | Recommended Number Color |
|---|---|
| White / Light colors | Black or dark blue |
| Black / Dark colors | White or yellow |
| Blue | White or yellow |
| Red | White |
| Green | White or yellow |
Common Display Mistakes
Avoid these common errors that can result in citations:
- Numbers too small — Must be at least 3 inches tall. Measure your numbers!
- Wrong location — Numbers must be on the forward half (bow area), not mid-hull or stern
- No spacing — Groups must be separated by spaces or hyphens
- Poor contrast — Faded numbers or low-contrast color combinations
- Script or decorative fonts — Only block letters are acceptable
- Displaying old numbers — When re-registering, remove old numbers before applying new ones
- Expired validation stickers — Keep validation decals current; expired stickers invite stops
USCG Documented Vessels
Federally documented vessels follow different display rules:
- Display the vessel name on the exterior of the hull
- Display the hailing port (city and state) on the exterior of the hull, typically on the stern
- The official documentation number must be permanently affixed to a visible interior structural member
- No state registration numbers are displayed on the bow
For more details, see our USCG Documentation Guide.
Frequently Asked Questions
What size do boat registration numbers need to be?
Registration numbers must be at least 3 inches tall in block letters. They must be displayed on both sides of the forward half of the vessel.
Can I use vinyl numbers or do they need to be painted?
Both vinyl adhesive numbers and painted numbers are acceptable, as long as they meet the size, color, and placement requirements. Vinyl numbers are the most popular choice.
Do I need to display the validation sticker?
Yes, most states require a current validation sticker or decal displayed within 6 inches of the registration number. Operating without a current sticker can result in a citation.
What happens if my numbers are too small or faded?
Law enforcement can cite you for improperly displayed registration numbers. Fines vary by state. Replace faded or damaged numbers promptly.