| Three Mile Bay, New York | |
| Settlement Type: | Census-designated place |
| Pushpin Map: | New York#USA |
| Pushpin Label: | Three Mile Bay |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | New York |
| Subdivision Type2: | County |
| Subdivision Name2: | Jefferson |
| Subdivision Type3: | Town |
| Subdivision Name3: | Lyme |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.77 |
| Area Land Km2: | 0.73 |
| Area Water Km2: | 0.03 |
| Area Total Sq Mi: | 0.30 |
| Area Land Sq Mi: | 0.28 |
| Area Water Sq Mi: | 0.01 |
| Elevation Ft: | 259 |
| Population As Of: | 2020 |
| Population Total: | 187 |
| Population Density Km2: | 255.23 |
| Population Density Sq Mi: | 660.78 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 44.0814°N -76.1983°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 13693 |
| Area Code: | 315 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 967455 |
| Blank1 Name: | FIPS code |
| Blank1 Info: | 36-73737 |
Three Mile Bay is a hamlet and census-designated place (CDP) in the town of Lyme in Jefferson County, New York, United States. The elevation is .[2] As of the 2010 census it had a population of 227.[3]
The hamlet has its own post office, a volunteer fire company, and boat launches for fishing and recreation in the various outlying bays that draw from Lake Ontario and the St. Lawrence seaway.
The community was settled between 1810 and 1820. Early resident Asa Wilcox built 48 brigs, propellers, schooners, and other seafaring vessels from 1835 to 1853. Some of these vessels, like the A.E. Vickery, ultimately joined the more than 500 shipwrecked vessels now resting at the bottom of the St. Lawrence River and Lake Ontario.[4] [5]
Three Mile Bay is in western Jefferson County, at the head of a bay of the same name, an inlet to Chaumont Bay of Lake Ontario. The community is in the western part of the town of Lyme along New York State Route 12E, which leads northwest 8miles to Cape Vincent on the St. Lawrence River and southeast to Watertown, the Jefferson county seat.
According to the U.S. Census Bureau, the Three Mile Bay CDP has an area of 0.67sqkm, all land.[3]