State Requirement Summary
Wisconsin assigns WS numbers — WS 9999 ZZ — and the spacing rule is unusually explicit: a space at least two inches wide between the letters and the numbers. Characters are block letters at least three inches tall, and Wisconsin specifically does not allow two-toned or camouflage registration numbers, so a single solid contrasting color is the safe choice. The validation decal sits three inches aft and directly in line with the number.
Last regulatory review: August 22, 2026
Assigned number example
WS 9999 ZZ
Wisconsin uses the WS prefix — not WI.
What we sell vs. what the state issues: RegistrationDecals.com supplies the registration-number lettering, designed to meet the displayed Wisconsin size and formatting requirements. Wisconsin 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.
Starts with the Wisconsin format (WS 9999 ZZ). Tap the decal and type your own assigned number exactly as it appears on your certificate of number.
Tap the decal to edit
We supply the registration-number lettering, sized to the displayed Wisconsin requirements. Wisconsin Department of Natural Resources issues the validation decal.
Both sides of the hull carry the number. The grey square marks where the state-issued validation decal goes — 3 inches aft and directly in line with the registration number.
Diagram is illustrative. Confirm exact positioning against the instructions issued with your Wisconsin registration.
Wisconsin Department of Natural Resources — Primary state agency source. Last verified August 22, 2026 (source check 2026-08-22).
Wisconsin DNR — BoatingRegistration 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.
Wisconsin assigns numbers in the pattern WS 9999 ZZ, using the WS prefix. Note that the vessel prefix (WS) is not the postal abbreviation (WI). Wisconsin uses the WS prefix, not WI. Two-toned and camouflage registration numbers are NOT legal.
Wisconsin 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.
BLOCK letters, reading left to right. Wisconsin specifically does not allow camouflage or two-tone registration characters.
Must contrast and be 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.
A space at least 2 inches wide between letters and numbers. Example: WS 9999 ZZ. Running the groups together with no separation does not match the stated format.
Each side of the forward half. No other registration-like numbers on the forward half.
3 inches AFT and directly in line with the registration number. The validation or expiration decal is issued by Wisconsin Department of Natural Resources — RegistrationDecals.com supplies the registration-number lettering only.
Wisconsin numbers follow the pattern WS 9999 ZZ, using the WS prefix, a numeral group, and suffix letters.
3 inches, measured on the character itself, in BLOCK letters.
BLOCK letters, reading left to right, and must contrast and be clearly visible.
A space at least 2 inches wide between letters and numbers. Example: WS 9999 ZZ.
Each side of the forward half. No other registration-like numbers on the forward half.
3 inches AFT and directly in line with the registration number. The decal itself is issued by Wisconsin Department of Natural Resources; we supply the registration-number lettering.
Wisconsin Department of Natural Resources. Confirm the current instructions issued with your registration before applying anything to your hull. Last regulatory review: August 22, 2026.
Yes. Enter your assigned WS 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.
WS. Wisconsin-registered vessels display the WS prefix — ordering WI produces the wrong number.
No. Wisconsin does not allow two-toned or camouflage registration numbers. Use one solid color that contrasts with the hull.
Our designer starts with plain block characters and proper group spacing, so you can see exactly how WS 9999 ZZ will read on your hull before you order.
Source: Wisconsin Department of Natural Resources · 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.
