It probably has to do with the CAD/AVL system, because the Town of Newburgh PD has been using the same numbers as the Village of Chester. Several years ago, the Village of Monroe PD changed their numbers because the Town of Cornwall had the same numbers. The previous Monroe numbers were 41x etc. Now they are 45x numbers. Before the County 911 system was around, duplicate car numbers at different agencies were not an issue, but once 911 started using the CAD & more recently the AVL system, duplicate numbers can cause confusion for dispatchers & conflict within the CAD/AVL systems when the "closest car" numbers pop up for a "polling" call.