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State LPN Rules Defining Letter O and Number Zero Character
Note: When both the letter O and number zero (0) are used by a given state and the characters are identical in appearance, the identity of the O/0 character is determined contextually, either by the serialization (standard-issue formatting) for that type of plate, or by the intention for the character on personalized/vanity plates.
Alabama – Only number zero (0) used.
Alaska – Both letter O and number zero (0) used. Letter O is not used for serialized plates.
Arizona – Both letter O and number zero (0) used. Letter O is not used for serialized plates.
Arkansas – Both letter O and number zero (0) used but are designed differently: Both characters are ovals, but letter O is slightly wider than number zero (0).
California – Both letter O and number zero (0) used. Number zero (0) not used for personalized plates.
Colorado – Both letter O and number zero (0) used but feature unique designs. Letter O is rectangular or
“box-shaped” while still having rounded corners on the outside. Number zero (0) is an oval.
Connecticut – Both letter O and number zero (0) used. Letter O is used in the 1ABCD2 serialization, but not in the 1AB·CD2 or 123·ABC serialization. Number zero (0) is eligible for all serialized plates.
Delaware – Both letter O and number zero (0) used. Personalized plates cannot have a number character following the letter O and cannot have the letter O following a number.
Florida – Only number zero (0) used.
Georgia – Only number zero (0) used.
Hawaii – Both letter O and number zero (0) used.
Idaho – Both letter O and number zero (0) used. Letter O is not used on special plate types or on
“overflow series” serialized passenger vehicle type plates.
Illinois – Both letter O and number zero (0) used. Letter O is not used for standard serialized plates, with exception to stacked lettering.
Indiana – Both letter O and number zero (0) used.
Iowa – Both letter O and number zero (0) used. Number zero (0) features a diagonal slash through the center of the character since 2012 and is not used for personalized plates.
Kansas – Both letter O and number zero (0) used.
Kentucky – Both letter O and number zero (0) used. Letter O is not used for serialized plates.
Louisiana – Both letter O and number zero (0) used. Substitution of the number zero (0) for the letter O are not allowed on personalized plates.
Maine – Both letter O and number zero (0) used. Letter O is not used on serialized plates since 1999.
Maryland – Only number zero (0) used.
Massachusetts – Both letter O and number zero (0) are used but feature unique designs since 2005. Letter O is rectangular or “box-shaped”. Number zero is rounder, drawn in a “stadium shape”.
Michigan – Only number zero (0) used.
Minnesota – Both letter O and number zero (0) used. Letter O is not used for serialized plates.
Mississippi – Both letter O and number zero (0) used. Letter O is not used for serialized plates.
Missouri – Both letter O and number zero (0) used. Letter O is not used for serialized plates.
Montana – Both letter O and number zero (0) used. Letter O is not used for serialized plates.
Nebraska – Both letter O and number zero (0) used. Letter O is not used for serialized plates.
Nevada – Both letter O and number zero (0) used. Letter O is not used for serialized plates, and number zero (0) is not used for personalized plates.
New Hampshire – Both letter O and number zero (0) used.
New Jersey – Both letter O and number zero (0) used. Letter O is not used on serialized plates.
New Mexico – Both letter O and number zero (0) used. Letter O is not used on serialized plates.
New York – Both letter O and number zero (0) used. Letter O is not used on serialized plates.
North Carolina – Only number zero (0) used, with a single exception allowing for the letter O as part of
the character string “OBX” at the beginning of an LPN.
North Dakota – Both letter O and number zero (0) used but are designed differently: Letter O is wider and circular, while number zero (0) is an oval.
Ohio – Both letter O and number zero (0) used. Number zero (0) is not used for personalized plates.
Oklahoma – Both letter O and number zero (0) used.
Oregon – Both letter O and number zero (0) used.
Pennsylvania – Both letter O and number zero (0) used but vary slightly in appearance due to the state’s
number characters being taller and narrower than letter characters.
Rhode Island – Both letter O and number zero (0) used but are designed differently: Both characters are ovals, but letter O is slightly wider than number zero (0). Personalized plates may only use number characters to end the LPN sequence.
South Carolina – Only number zero (0) used.
South Dakota – Both letter O and number zero (0) used. Letter O is not used on serialized plates.
Tennessee – Both letter O and number zero (0) used. Letter O is not used on serialized plates.
Texas – Only number zero (0) used.
Utah – Both letter O and number zero (0) used. Letter O is not used on serialized plates.
Vermont – Both letter O and number zero (0) used. Letter O is not used on serialized plates.
Virginia – Both letter O and number zero (0) used. The O/0 is determined by the character immediately preceding it: When following a letter character or beginning the LPN, it is the letter O, but when following a number character, it is a zero (0).
Washington – Both letter O and number zero (0) used.
West Virginia – Both letter O and number zero (0) used.
Wisconsin – Both letter O and number zero (0) used. Letter O is not used on serialized plates.
Wyoming – Both letter O and number zero (0) used.
Many important updates were found:
Most states do not use the letter O on serialized plates.
Georgia, Maryland, Michigan, and South Carolina only use the number zero (0), never the letter O.
Some states, like Massachusetts, Colorado and Iowa, differentiate the O and zero (0) characters by differences in design/appearance.
Sources Used: “Vehicles Registration Plates of (state name)” Wikipedia pages, allaboutlicenseplates.com, various state DMV/MVA (etc.) websites where rules are posted and/or confirming personalized plate availability is allowed, and, in very limited cases, from ERT system LPN records that confirm character rules based on lookup success.