| Official Name: | Greendale, Pennsylvania |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Pennsylvania |
| Pushpin Label: | Greendale |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Pennsylvania |
| Subdivision Type2: | County |
| Subdivision Name2: | Armstrong |
| Subdivision Type3: | Township |
| Subdivision Name3: | Valley |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 1066 |
| Coordinates: | 40.8053°N -79.3869°W |
| Postal Code Type: | ZIP code |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1176143 |
Greendale is an unincorporated community in Valley Township, Armstrong County, Pennsylvania, United States.
A post office called Greendale was established in 1867.[1] It remained in operation until 1905. Greendale P.O. appears in the 1876 Atlas of Armstrong County, Pennsylvania.[2]
