Most of these are standard Taxi issues, but if no state issue exists, I'll also accept the smaller sized supplemental and city/county issue plates (like the Minnesota type).

Have one not pictured you'd like to sell?  Email me! - Drewski - Drew@PL8S.com

Alabama - "X3" series for Taxis

Alaska - full FOR HIRE legend

NEED

ARIZONA
"P2" 2ZA-3ZE prefix

Arkansas - full FOR HIRE legend

California - full LIVERY legend

NEED

COLORADO
City issues - no state issue

Connecticut - full TAXI legend

Delaware - full TAXI legend

District of Columbia - "H" - Hire series

Florida "E" series - FOR HIRE vehicles

NEED

GEORGIA
Passenger - no special issue

NEED

HAWAII
Passenger - no special issue

NEED

IDAHO
TX suffix, or full legend - older

Illinois - full TAXI legend

NEED

INDIANA
Passenger - small city issues?

No state issue, town issues are known.

Kansas - KCC - Kansas Corporation Committee

Kentucky - small TAXI series

Louisiana - full HIRE TAXI legend

Maine - full HIRE legend

Maryland - full HIRE legend

Massachusetts - full TAXI legend

Michigan - City series from Wayne - 2005

Minnesota - Mankato town series, 1974

NEED

MISSOURI
Passenger - small city issues?

NEED

MONTANA
Passenger - small city issues?

Nebraska - full TAXI legend

Nevada - small series TX prefix

No standardized state issue - town issues exist

New Jersey - full OMNIBUS legend series

New Mexico - TX series prefix

New York - Taxi and Livery Commission

North Carolina - T prefix taxi series

NEED

NORTH DAKOTA
1934-47 only, plus city issues

Ohio - Toledo city series

Oklahoma - Full TAXI CAB legend

NEED

OREGON
Passenger - small city issues?

Pennsylvania - full TAXI legend

Rhode Island - 1953/54 full TAXI legend

South Carolina - full TAXI legend

NEED

SOUTH DAKOTA
"CU T" prefix plates

Tennessee - full TAXI CAB legend

Texas - Houston City series, 1975

Undated black/refl white; "UTAH 73" bottom; AA 0000 format; steel & aluminum - taxis have "LA" thru "WW" prefixes

NEED

VERMONT
Passenger - small city issues?

Virginia - "H" Hire

NEED

WASHINGTON
R prefix with FOR HIRE legend

West Virginia - "J" series, Jitney-Taxi

Taxi - graphic farm base; "ZZ"A-000 serial format, reserved series

NEED

WYOMING
Passenger - small city issues?

Alberta - "L" series, Livery

British Columbia, Victoria City Cab - 1950

Manitoba - full legend TAXI

New Brunswick - full legend TAXI

Newfoundland - TX_ prefix, Taxi series

Nova Scotia - Yamouth City issue, 1955

NEED

NUNAVUT
Iqaluit small, or P series Public

Ontario - Stoney Creek City issue

NEED

PRINCE EDWARD IS
Charlottetown small, or other city

Quebec - T series (Taxi)

 Saskatchewan - UL, Livery series. Yukon Territory - "L" series (Livery)

NEED

Puerto Rico
Straight "TAXI" legend

Guam

American Samoa - T series, Taxi

Virgin Islands - St. Thomas