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Pennsylvania's 18th congressional district includes parts of Washington County, Allegheny and Westmoreland Counties. Republican Tim Murphy has represented the district since 2003.
The district is predominantly white and suburban, although it contains a diverse range of suburbs. The eastern portion of the district contains some rural regions of Washington County, as well as the very wealthy suburbs located in the northern portion of this county, such as Peters Township. This portion of Washington County tends to me more Republican than the portion contained in the neighboring 12th District. Many of Allegheny County's southern suburbs of Pittsburgh are located in the district, which range from traditonal wealth areas such as Mount Lebanon, middle class communities such as Bethel Park and Brentwood, and working class labor towns such as Elzabeth.
The district also winds along the western suburbs at the edge of Allegheny County, including most of the large suburban commerical center of Monroeville, and in eastern Westmoreland County. Central Westmoreland County, incluing the generally Republican city of Greensburg, and the rural foothills areas of the county are located at the district's eastern end.
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