| Deer Lake, Fayette County, Pennsylvania | |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Label: | Deer Lake |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Pennsylvania |
| Subdivision Type2: | County |
| Subdivision Name2: | Fayette |
| Subdivision Type3: | Township |
| Subdivision Name3: | Wharton |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 4.16 |
| Area Land Km2: | 3.92 |
| Area Water Km2: | 0.24 |
| Population As Of: | 2020 |
| Population Total: | 482 |
| Population Density Km2: | 122.85 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 39.8481°N -79.5906°W |
| Elevation Ft: | 1936 |
| Postal Code Type: | ZIP codes |
| Blank Name: | FIPS code |
| Blank Info: | 42-18568 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2631258 |
| Area Total Sq Mi: | 1.61 |
| Area Land Sq Mi: | 1.51 |
| Area Water Sq Mi: | 0.09 |
| Population Density Sq Mi: | 318.15 |
Deer Lake is an unincorporated community and census-designated place in Wharton Township, Fayette County, Pennsylvania, United States. It is east of Chalkhill and 5miles northwest of Farmington in the Laurel Highlands of southwestern Pennsylvania. As of the 2010 census, the population was 495.[2]