Major Intersections
| County | Location | Mile | km | Destinations | Notes |
|---|---|---|---|---|---|
| Allegany |
Village of Andover | 0.00 | 0.00 | NY 417 | |
| Town of Alfred | 8.80 | 14.16 | NY 244 | Hamlet of Alfred Station; eastern terminus of NY 244 | |
| Village of Almond | 12.78 | 20.57 | I-86 / NY 17 | Exit 33 (I-86 / NY 17) | |
| Steuben |
Hornell | 17.45 | 28.08 | NY 36 south | Southern terminus of NY 21 / NY 36 overlap |
| 19.97 | 32.14 | NY 36 north | Northern terminus of NY 21 / NY 36 overlap | ||
| Town of Wayland | 36.89 | 59.37 | I-390 / NY 15 | Exit 3 (I-390); southern terminus of NY 15; southern terminus of NY 15 / NY 21 overlap | |
| 37.05 | 59.63 | NY 415 | Northern terminus of NY 415 | ||
| Village of Wayland | 38.75 | 62.36 | NY 15 north / NY 63 | Northern terminus of NY 15 / NY 21 overlap; southern terminus of NY 63 | |
| Town of Cohocton | 45.52 | 73.26 | NY 371 | Hamlet of North Cohocton; northern terminus of NY 371 | |
| Ontario |
Village of Naples | 50.04 | 80.53 | NY 53 | Northern terminus of NY 53 |
| 51.50 | 82.88 | NY 245 | Southern terminus of NY 245 | ||
| South Bristol | 57.68 | 92.83 | NY 64 | Hamlet of Bristol Springs; southern terminus of NY 64 | |
| Town of Canandaigua | 70.81 | 113.96 | US 20 west / NY 5 west | Western terminus of US 20 / NY 5 / NY 21 overlap | |
| City of Canandaigua | 72.44 | 116.58 | US 20 east / NY 5 east / NY 332 | Eastern terminus of US 20 / NY 5 / NY 21 overlap; southern terminus of NY 21 / NY 332 overlap; southern terminus of NY 332 | |
| 73.39 | 118.11 | NY 332 north | Northern terminus of NY 21 / NY 332 overlap | ||
| Hopewell | 76.61 | 123.29 | NY 488 | Hamlet of Chapin; southern terminus of NY 488 | |
| Village of Manchester | 80.59 | 129.70 | NY 96 | ||
| 80.87 | 130.15 | I-90 / Thruway | Exit 43 (I-90 / Thruway) | ||
| Wayne |
Village of Palmyra | 86.87 | 139.80 | NY 31 west | Western terminus of NY 21 / NY 31 overlap |
| 87.49 | 140.80 | NY 31 east | Eastern terminus of NY 21 / NY 31 overlap | ||
| Williamson | 99.99 | 160.92 | NY 104 |
Read more about this topic: New York State Route 21
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—Elaine Heffner (20th century)