Pilsbury represented Brazoria County in the House of the republic in 1840 and 1841 and the Senate in 1842. After serving as Brazoria County chief justice and probate judge, he returned to the Senate in 1845 and on March 30, 1846, was elected by the Texas legislature as a Democrat to the United States House of Representatives. In Washington he represented a district that included all of Texas west of the Trinity River until March 13, 1849. He ran unsuccessfully for reelection in 1848. Pillsbury, who was a Mason, died in Henderson, Texas, on November 23, 1858, and was buried in the Henderson City Cemetery.
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Henderson City Cemetery