West Middlesex Borough, Mercer County, Pennsylvania
| West Middlesex | |
| Borough | |
| Country | United States |
|---|---|
| State | Pennsylvania |
| County | Mercer |
| Area | 2.5 sq mi (6 km2) |
| Population | 929 (2000) |
| Density | 981.8 / sq mi (379 / km2) |
| Established | 1836 |
| Mayor | David George |
| Timezone | EST (UTC-4) |
| - summer (DST) | EDT (UTC-5) |
| Zip code | 16159 |
| Area code | 724 |
 Location of West Middlesex in Mercer County
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 Location of West Middlesex within Pennsylvania
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 Location of Pennsylvania in the United States
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