Roads maintained by NYSDOT are further subdivided into 11 regions. These regions are drawn on county lines. Each region develops its own projects and policies (for example, Region 2 is famous for using boxed street names on signage). Each county also has its own code based on the region, usually following the alphabetical order of the county names, but exceptions exist when region boundaries change (such as Region 11 splitting off from Region 10).

Map of NYSDOT Regions
Region 1
Includes Albany (11), Essex (12), Greene (13), Rensselear (14), Saratoga (15), Schenectady (16), Warren (17), and Washington (18) Counties
Region 2
Includes Fulton (21), Hamilton (22), Herkimer (23), Madison (24), Montgomery (25), and Oneida (26) Counties
Region 3
Includes Cayuga (31), Cortland (32), Onondaga (33), Oswego (34), Seneca (35), and Tompkins (36) Counties
Region 4
Includes Genesee (41), Livingston (42), Monroe (43), Ontario (44), Orleans (45), Wyoming (46), and Wayne (47; formerly 37) Counties
Region 5
Includes Cattaruagus (51), Chautauqua (52), Erie (53), and Niagara (54) Counties
Region 6
Includes Allegany (61), Chemung (62), Schuyler (63), Steuben (64), and Yates (66) Counties
Region 7
Includes Clinton (71), Franklin (72), Jefferson (73), Lewis (74), and St. Lawrence (75) Counties
Region 8
Includes Columbia (81; was planned to be transferred to Region 1), Dutchess (82), Orange (83), Putnam (84), Rockland (85), Ulster (86), and Westchester (87) Counties
Region 9
Includes Broome (91), Chenango (92), Delaware (93), Ostego (94), Schoharie (95), Sullivan (96), and Tioga (97; formerly 65) Counties
Region 10
Includes Nassau (03) and Suffolk (07) Counties
Region 11 (NYC)
Includes Bronx (01 - The Bronx), Kings (02 - Brooklyn), New York (04 - Manhatten), Queens (05 - Queens), and Richmond (06 - Staten Island) Counties

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