Deemston is a borough in Washington County, Pennsylvania. It is located about 50 miles away from Pittsburgh, the second largest city in the state.

According to the United States Census Bureau of 2000, Deemston is home to more than 800 residents. The borough has a total area of 9.6 square miles all of it land.

The racial composition of Deemston is more than 99% white with other groups making up less than 1% of the population.

Deemston has more than 300 households. The median income for a household in the borough is $35,598, and the median income for a family is $41,188.

Washington County is surrounded by five counties in western Pennsylvania and four counties of West Virginia. The county has a population of over 200,000 people living in an area of 861 square miles, of which less than 1% is water.

Washington County has 33 boroughs, 32 townships, and nine census-designated areas. The county seat is Washington.

Washington County is served by local higher education institutions of Washington & Jefferson College, California University of Pennsylvania, Community College of Allegheny County and University of Phoenix. The county is served by more than a dozen public school districts.

Three hospitals serve Washington County, The Washington Hospital, Canonsburg General Hospital, Monongahela Valley Hospital.

Washington County was the location of the historic event of the Whiskey Rebellion in 1791. The home of David Bradford, one of the famous rebels, is located in Washington and is a national landmark.