| Official Name: | Cornwallville, New York |
| Settlement Type: | Hamlet |
| Pushpin Map: | New York#USA |
| Pushpin Label: | Cornwallville |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | New York |
| Subdivision Type2: | County |
| Subdivision Name2: | Greene |
| Subdivision Type3: | Town |
| Subdivision Name3: | Durham |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 958 |
| Coordinates: | 42.3681°N -74.1581°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 12418 |
| Area Code: | 518 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 947485 |
Cornwallville is a hamlet in the town of Durham, Greene County, New York, United States. The zipcode is: 12418.[1] Its estimated population in 2018 was 408.[2]