| Long Green | |
|---|---|
| — Unincorporated community — | |
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Long Green
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| Coordinates: | |
| Country | United States |
| State | Maryland |
| County | Baltimore |
| Time zone | Eastern (EST) (UTC-5) |
| • Summer (DST) | EDT (UTC-4) |
| ZIP codes | |
| FIPS code | |
| GNIS feature ID | 590695 |
Long Green is an unincorporated community in Baltimore County, Maryland, United States.[1] Until 1958, the community was served by the Maryland and Pennsylvania Railroad at milepost 15.8. Prospect Hill was listed on the National Register of Historic Places in 1973.[2]