John L. Blair, 1814-1887, was born in Maryland, the son of Andrew Jackson Blair (1783-1849) and Catherine Onwiler (1790-1855), who married in 1803 and had thirteen children, born between 1812 and 1830. John married Sarah Rickert (1812-1898) on 12 December 1836. They had three children, Susan, Martin L., and Sarah Jane.  John and Sarah married in Washington County, Maryland. 
In 1850, the Blair family lived in Montgomery,mFranklin, Pennsylvania. The three children were in school. The household included
In 1860, the Blair family lived in Montgomery Township, Franklin, Pennsylvania. The family included
NOTE: on the Census for 1850 and for 1860, a neighbor of the Blairs was the Zuck family (three generations). Martin Blair would later marry a Zuck daughter, Barbara Ann Zuck (1851-1949).
In 1880, the Blair family lived in Welsh Run, Montgomery Township, Franklin, Pennsylvania. John Blair, 66, helps on (his son’s) farm. His wife, Sarah, was 67. Living nearby (or on same property) was their son, Martin L. Blair, 38, a farmer; his wife, Barbara, 28; five children; and a servant.  
John Blair, 1813-1887, died, aged 73, in Welsh Run, Franklin, Pennsylvania. He is buried with his wife and two of their children, and other family, at Welsh Run Brethren Church Cemetery, Welsh Run, Pennsylvania. 
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