Andrew Selsor was born around 1807 in Virginia. He moved to Kentucky by the 1820s, and he married Nancy Wade there in 1828. They had at least nine children: Ritty, born around 1829; Syntha, born on March 1, 1830; Mahala, born around 1834; Francis, born around 1836; George, born around 1838; Andrew, born around 1839; Cave, born around 1841; James, born around 1843; and Nancy, born around 1846. They moved to Indiana in the late 1820s. By 1850, they were living in Brown, Indiana, and Selsor was working as a farmer. They owned $400 of real estate. They moved to Medicine, Missouri, in the 1850s, and by 1860, he owned $1,500 of real estate and $600 of personal property.
Selsor enlisted in the Union army on September 1, 1864, and he mustered in as a private in Company A of the 43rd Missouri Infantry. His wife died sometime in the 1860s, and he married Amelia Massach. They had at least three children: Stephen, born around 1866; Josephine, born around 1867; and Maria, born around 1871. They lived in Hamilton, Iowa, and by 1870, Selsor owned $1,600 of real estate and $450 of personal property. He applied for a federal pension in July 1879 and eventually secured one. They moved to Doyle, Iowa, in the 1870s, and he died there on August 24, 1881.