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Vehicle registration plates of the United States by year
Vehicle registration plates of the United States for 1920	Events of 1921	Vehicle registration plates of the United States for 1922

Each of the 48 states of the United States of America plus several of its territories and the District of Columbia issued individual passenger license plates for 1921.^[1]^[2]^[3]^[4]

Passenger baseplates

Passenger car plates
Region	Design	Slogan	Serial format	Serials issued	Notes
Alabama	Embossed red lettering and rims on white base. "21" embossed vertically at left; "ALA" at right.	none	12345
Alaska					First year for territory plates. State plates begin in 1959.
American Samoa					Territory issued plates begin in 1924.
Arizona
Arkansas
California	Embossed black lettering and rims on yellow base.	none		unknown
Canal Zone	Embossed black on gray-green background	none	1234
Colorado			123–456
Connecticut	Embossed yellow numbers on black plate with border line; "CONN.–1921" embossed in yellow characters centered at bottom.	none	12-345 123–456	1 to approximately 110-000
Delaware
District of Columbia
Florida
Georgia
Guam
Hawaii					Territory issued plates begin in 1922. State issued plates begin in 1959.
Idaho	Embossed black numbers on white plate with border line; "IDAHO 54" embossed in black block letters centered at bottom.	none	A 12345 0/A 12345		Coded by county
Illinois	lettering and rims embossed on base; "ILL 21" embossed at right.	none	123–456	1 to approximately ??
Indiana	Black lettering embossed on orange base.	none	123456		County-coded
Iowa	Embossed silver lettering on black base; "IA 21" embossed at right.	none. Slogan introduced in 1953 as the state's unofficial nickname.	123456	1 to an approximate 441000
Kansas	Embossed black numbers on orange plate with border line; "KAN 21" embossed in black block letters at right.	none	123456		County-coded
Kentucky	Brown base with white embossed lettering and border. "KY. 1921" at right.	none	123456		Issued in blocks by county
Louisiana			12345
Maine	Embossed white lettering and rims on red base. "MAINE 1921" embossed at bottom center.	none	12-345 123–456 (both with square dash)
Maryland	Embossed red numbers and rims on white plate; "MD 21" embossed at bottom center.	none	123–456
Massachusetts
Michigan	White embossed lettering on black base, stylized "MICH 21" at left.	none	123–456		Issued in front and rear pairs.
Minnesota	Embossed black lettering and rims on turquoise plate; "MINN" embossed vertically at right.	A123456		"A" for weight class of vehicle.
Mississippi	White with embossed red lettering and rim. "1921" stamped vertically to left of registration number, "MISS" stamped vertically to right.	none	12345	unknown
Missouri	Embossed XX lettering and rims on XX base. "MO 1921" embossed at bottom.	none	12-345
Montana	Embossed XX numbers on XX base.	none
Nebraska		none
Nevada		none
New Hampshire		none			County-coded
New Jersey	Embossed white lettering on green base; "N. J. 21" embossed at top.	none	123456
New Mexico		none
New York	Embossed white lettering and rims on navy blue base; "NY 1921" embossed at bottom center.	none	123–456
North Carolina	Embossed white letters on brown base.	none	123456
North Dakota	Embossed black serial on golden yellow plate with border line; vertical "ND" and "1922" at left and right respectively	none	12-345	1 to approximately 99-000
Northern Mariana Islands					Territory issued plates begin in 1944.
Ohio
Oklahoma		none
Oregon	Embossed white numbers on green plate. "ORE 1921" embossed at right.	none	12345
Pennsylvania	Embossed blue lettering on yellow base. "PENNA 1921" embossed at bottom with keystone logos on either side.	none	1–234
Puerto Rico
Rhode Island	Embossed black serial on white plate with border line; "R.I. 1921" centered at bottom	none	12345	1 to approximately 43000	First embossed plate.
South Carolina		none
South Dakota	Embossed white lettering on green base.	none	123456	30000 to approximately 154000	Numbers below 30000 reserved for motorcycles and trucks.
Tennessee		none	12345
Texas			123–456
Utah	Embossed yellow lettering and top and bottom border on black plate. "U 21" embossed at right.	none	12345
Vermont	Embossed dark green numbers on white plate; "54 VERMONT" embossed in dark green block letters centered at bottom.	none	12345 A1234
Virginia	Embossed dark blue lettering on orange plate.	none	12345
Washington		none
West Virginia		none	12345
Wisconsin	Embossed black serial on light gray plate; vertical "WIS" over "21" at right	none	123-456	1 to approximately 320-000
Wyoming	Embossed white numbers on black 1920 base plate; "1921 WYO" embossed in black-on-green metal insert at left.	none	12345

Non-passenger plates

Non-passenger Plates
Region	Type	Design & Slogan	Serial format	Serials issued	Notes
Wisconsin	Dealer	Embossed black serial on light gray plate; vertical "WIS" over "21" at right; embossed solid star at left	1234A	Dealer number and plate number	The number is the dealer number, the letter is the plate number for that dealer.
	Motorcycle	Embossed black serial on light gray plate; "W" over "21" at right; serial is slanted at a 45-degree angle	1234	1 to approximately 6000
	Truck	Embossed black serial on light gray plate; vertical "TRUCK" at left, vertical "WIS" over "21" at right.	12-345	1 to approximately 16-000

References

^ Fox, Jams K. (1997). License Plates of the United States: A Pictorial History 1903-To the Present. Jerico, New York: Interstate Directory Publishing Company. ISBN 9781886777002.
^ Minard, Jeff; Stentiford, Tim (2004). A Moving History, 50 Years Of ALPCA. 100 Years Of License Plates. Paducah, Kentucky: Turner Publishing Company. p. 58. ISBN 1-56311-975-7.
^ Crisler, Bob; Crisler, Chuck, eds. (2007). License Plate Values (7th ed.). King Publishing Company.
^ Martells, Jack (1980). Antique Automotive Collectibles. Chicago: Contemporary Books, Inc. pp. 128–145. ISBN 0-8092-7205-9.