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- [S2] 1880 US Census.
District 18, Allegheny, Allegheny, PA (David Johnson) Age 25 Born in Ireland (Father & Mother born in Ireland)
- [S3] 1900 US Census.
District 60, Allegheny Ward 6, Allegheny, PA (David Johnston) Age 51 Born in Ireland Feb 1849 (Father & Mother born in Ireland) Immigrated 1870
- [S7] 1910 US Census.
District 574, Pittsburgh Ward 21, Allegheny, PA (David Johnston) Age 61 Born in Scotland (Father & Mother born in Scotland) Immigration Year 1870
- [S4] 1920 US Census.
District 666, Pittsburgh Ward 21, Allegheny, PA (David Johnston) Age 70 Born in Ireland (Father & Mother born in Ireland) Immigrated 1868
- [S3] 1900 US Census.
District 60, Allegheny Ward 6, Allegheny, PA (David & Elizabeth Johnston) Married for 28 Years
- [S7] 1910 US Census.
District 574, Pittsburgh Ward 21, Allegheny, PA (David & Elizabeth Johnston) Married for 35 Years
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