Mount Vernon is an unincorporated community located within Elizabeth Township, Allegheny County, Pennsylvania, United States.
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| Cities |
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| Boroughs |
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| Townships |
- Aleppo
- Baldwin
- Collier
- Crescent
- East Deer
- Elizabeth
- Fawn
- Findlay
- Forward
- Frazer
- Hampton
- Harmar
- Harrison
- Indiana
- Kennedy
- Kilbuck
- Leet
- Marshall
- McCandless
- Moon
- Mt. Lebanon
- Neville
- North Fayette
- North Versailles
- O'Hara
- Ohio
- Penn Hills
- Pine
- Reserve
- Richland
- Robinson
- Ross
- Scott
- Shaler
- South Fayette
- South Park
- South Versailles
- Springdale
- Stowe
- Upper St. Clair
- West Deer
- Wilkins
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| CDPs |
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Unincorporated
communities |
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| Footnotes |
‡This populated place also has portions in an adjacent county or counties
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