Union Cemetery, Leesburg, Loudoun County, Virginia, The Later Plats, 1880-1995 - Elizabeth R. Frain. Union Cemetery, the largest cemetery in Loudoun County, Virginia, opened in the 1850s. The cemetery is described in lot order so that the researcher can evaluate neighbors. Information was taken from headstones, cemetery card index, and other sources. Records include (where known): name of deceased, date of birth, date of death, cause of death and relationships. 1997, 6x9, paper, index, 294 pp.