| Official Name: | Locust Grove, New York |
| Utc Offset Dst: | -4 |
| Area Water Km2: | 0.0 |
| Area Total Sq Mi: | 1.07 |
| Area Land Sq Mi: | 1.07 |
| Area Water Sq Mi: | 0.0 |
| Population As Of: | 2010 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Elevation M: | 60 |
| Elevation Ft: | 197 |
| Coordinates: | 40.8101°N -73.5021°W |
| Postal Code Type: | ZIP Code |
| Postal Code: | 11791 |
| Area Code: | 516, 363 |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0970312 |
| Subdivision Name3: | Oyster Bay |
| Subdivision Type3: | Town |
| Settlement Type: | Hamlet and former census-designated place |
| Pushpin Map: | USA New York Long Island#New York |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | Location on Long Island##Location within the state of New York |
| Mapsize: | 260px |
| Subdivision Type: | Country |
| Unit Pref: | Imperial |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Nassau |
| Pushpin Label: | Locust Grove, New York |
| Area Code Type: | Area codes |
Locust Grove is a hamlet and former census-designated place (CDP) in the Town of Oyster Bay in Nassau County, on Long Island, in New York, United States. It is located within the CDP of Syosset, which absorbed it for the 1990 United States Census.
The name Locust Grove was first used by the United States Census Bureau to define the community for the 1960 United States census.[1]
The Locust Grove CDP was absorbed by the Syosset CDP for the 1990 United States Census.[2]
On October 22, 1990, over 4,000 electrical customers in Locust Grove, Woodbury, and Syosset were left without electricity when an underground power cable in the hamlet was accidentally struck by construction workers. Power was restored later that day.[3]
According to the United States Geological Survey, Locust Grove is located roughly 197feet above sea level.[4] [5]
Locust grove has an area of roughly 1.07sqmi.
At the time of the 1960 United States census, the population of Locust Grove was 11,558.[6]
At the time of the 1970 United States census, the population of Locust Grove was 11,626.
At the time of the 1980 United States census, the population of Locust Grove was 9,670.[7]
Additionally, in 1990, the Long Island Lighting Company (LILCO) estimated the total population to be 9,060, as of January 1 of that year.