Hastings, Hugh. Military Minutes of the Council of Appointment of the State of New York, 1783-1821 (4 volume set). Albany: State of New York | James B. Lyon, Printer, 1901-1902. First Edition. 
Four volumes in green cloth, bright gilt spine titles, first three with old paper spine lables, 9 x 6 1/2 inches, all bindings clean and fine. Texts also clean, illustrated with b/w plates, bindings tight. 3,038 pp. in the set. Very good. Hardcover.
"The subject matter contained in these volumes comprises the military appointments made by the Council of Appointment, beginning after the last name mentioned in "New York in the Revolution" to the adoption of the second constitution of 1821. It the thousands of names here presented will be found those of men who have been prominently identified with the history of the State in the arts, sciences, and law. Several governors and United States senators performed duty as militiamen during the good old times when the 'training day' was one of the features of the year." - Vol. I., p. 60.
The counties of New York State were much larger then than now. The set has an outstanding index volume (Vol. IV.), with both an index of names and a general index.
A chronological listing, by county, of military appointments, by regiment.
Here is an example, for the year 1800, Chenango County: "His Excellency the Commander-in-chief, on the report and recommendation of the adjutant general, having thought proper to form the militia of the county of Chenango into a brigade; therefore, Resolved, that Jonathan Forman be and he is hereby appointed brigadier general thereof, and Benjamin Ray inspector to serve also as brigade major with the rank of a major...having thought proper to form the militia of the towns of Hamilton, Sherburne, Sangerfield and Brookfield in the said county of Chenango into two regiments; therefore, Resolved, that Samuel Clemons, be and he is hereby appointed lieutenant colonel commandant of the other of the said regiments, comprehending the towns of Sangerfield and Brookfield."