NYSP info

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Bobby, this is what I found doing a quick search on Wikipedia for the New York State Police -

Car Numbers

A patrol car number will contain the Troop and Zone or group prefix: for example, car 1A30 would be a patrol car in Zone 1 of Troop A. Prefix numbers 1 through 4 are used for geographic patrol zones, while 5 is used by BCI Investigators, 6 by Portables, 7 by other local agencies dispatched by NYSP, 8 by special state units (e.g. State Park Police), and 9 by dispatchers. Cars not carrying prefixes, for instance K55, are Troop Headquarters cars. The New York State Police also use a standard number-blocking system to identify the type of unit carrying a particular number:

ADMINISTRATIVE
L1 - Major
L2-L4 - Captains
L5 - Bureau of Criminal Investigation Captain
L10-L49 - Troop Administration - Marked cars
L50-L69 - Troop Administration - Unmarked cars
L70-L89 - Miscellaneous Administration
L90-L99 - Troop Communications
L101-L109 - Traffic Incident Management Team

UNIFORMED TROOPERS
1L1 - Lieutenant
1L10-1L49 - Marked Cars
1L50-1L79 - Unmarked Cars
1L80-1L89 - Miscellaneous Units

BUREAU OF CRIMINAL INVESTIGATION (BCI)
L5 - BCI Captain
5L1 - BCI Lieutenant
51L5-5L24 - BCI Senior Investigators
51L25-5L199 - BCI Investigators

PORTABLES
6L1-6L99 - Administrative Portables
6L100-6L499 - Trooper Portables
6L500-6L599 - BCI Portables

SPECIAL UNITS
Henry (H) - State P.D. Headquarters Division
John (J) - State P.D. Narcotics Units
Mary (M) - State P.D. Major Crimes Units
Nora (N) - State Environmental Conservation P.D.
Paul (P) - Department of Corrections
Robert (R) - State P.D. Communications Division
Sam (S) - State P.D. Special Investigations Units
Victor (V) - State P.D. Violent Felony Warrant Squad
X-Ray (X) - State P.D. Governor's Protection Unit

I prefer not to use Wikipedia as a source of information, so take this for what it's worth!