The Troy Numbering System

The number key is created using one digit for the town, a letter ID for the cemetery or some special category, and a four-digit number for the grave (each cemetery's graves numbered from 0001). 
 
The four-digit numbers are assigned in alphabetical order, and so numbered: 

1 - CARMEL
2 - KENT
3 - PATTERSON
4 - PHILIPSTOWN
5 - PUTNAM VALLEY
6 - SOUTHEAST

(7A-7J are reserved for proposed Putnam State Veterans Cemetery)

Letters (A-X) indicate Cemetery Names, listed alphabetically by most commonly used name

Y - Indicates "wandering stones" when applicable
Z - Indicates long-lost and legendary cemeteries (including rumored Indian plots)
NH - Indicates non-historic cemeteris
 
0001-9999 - based on alphabetical listing by last name.
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Example: Troy #1P0005 
 
1 = Town = Carmel
P = Cemetery = Old Methodist Cemetery, Mahopac 
0005 = grave (by surname) = Mary Arnold
 
 
Included some alleged Indian cemeteries, based on a map of Indian sites (source unknown).  They're shown in italics.  A copy of the map is attached.