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Bristol is a borough in Bucks County , Pennsylvania , 23 miles (37 km) northeast of Philadelphia opposite Burlington, N.J. on the Delaware River . Bristol was first incorporated in 1720 . Although its charter was revised in 1905 , the original charter remains in effect, making Bristol one of the older boroughs in Pennsylvania . 7,104 people lived in Bristol in 1900 ; 9,256 in 1910 ; 10,273 in 1920 ; and 11,895 in 1940 . The population was 9,923 at the 2000 census . The current Mayor is Joseph Saxton. The first woman Mayor was Margaret Stakenas elected in 1979.