1790 Washington County, Pennsylvania Census Records
- Free 1790 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Census Guide
1800 Washington County, Pennsylvania Census Records
- Free 1800 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Census Guide
1810 Washington County, Pennsylvania Census Records
- Free 1810 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at USGenWeb Census Project
- Hosted at Washington County, Pennsylvania PAGenWeb Project
- Amwell Township
- Buffalo Township
- Canton Township
- Cecil Township
- Chartiers Township
- Chartiers Township (Corrected)
- Cross Creek Township
- Cross Creek Township (Corrected)
- Donegal Township
- East Bethlehem Township
- Fallowfield Township
- Fallowfield Township (Corrected)
- Fallowfield Township – 2nd transcript
- Finley Township
- Hanover Township
- Hopewell Township
- Morris Township
- Mount Pleasant Township
- Nottingham Township
- Nottingham Township (Corrected)
- Peters Township
- Pike Run Township
- Robinson Township
- Smith Township
- Straban (Strabane) Township
- Straban Township (Corrected)
- Somerset Township
- West Bethlehem Township
- Hosted at Pennsylvania USGenWeb Archives
- Hosted at USGenWeb Census Project
- Index A-G
- Index H-M
- Index N-Z
- Notes
- Town of Washington and Strabane Townships
- Canton and Peters Townships
- Cecil, Robinson and Chartiers Townships
- Mount Pleasant and Smiths Townships
- Hanover and Cross Creek Townships
- Hopewell and Buffaloe Townships
- Amwell, and Somerset Townships
- Nottingham and Fallowfield Townships
- Pike Run and East Bethlehem Townships
- West Bethlehem and Morris Townships
- Finley and Donegall Townships
- Hosted at Census Guide
1820 Washington County, Pennsylvania Census Records
- Free 1820 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Census Guide
1830 Washington County, Pennsylvania Census Records
- Free 1830 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Census Guide
1840 Washington County, Pennsylvania Census Records
- Free 1840 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Census Guide
1850 Washington County, Pennsylvania Census Records
- Hosted at Free 1850 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Census Guide
1860 Washington County, Pennsylvania Census Records
- Free 1860 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at FamilySearch.org
- 1860 Census Search, Free
- Hosted at Census Guide
1870 Washington County, Pennsylvania Census Records
- Free 1870 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Family Search.org
- Hosted at Census Guide
1880 Washington County, Pennsylvania Census Records
- Free 1880 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at FamilySearch.org
- 1880 Census Search, Free
- Hosted at Census Guide
1890 Washington County, Pennsylvania Census Records
- Free 1890 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Census Guide
1900 Washington County, Pennsylvania Census Records
- Free 1900 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Family Search.org
- 1900 US Federal Census – Un-indexed, browsable
- Hosted at Census Guide
1910 Washington County, Pennsylvania Census Records
- Free 1910 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Census Guide
1920 Washington County, Pennsylvania Census Records
- Free 1920 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Family Search.org
- 1920 US Federal Census – Not complete
- Hosted at Census Guide
1930 Washington County, Pennsylvania Census Records
- Free 1930 Census Form for your Research
- Hosted at Ancestry.com – Ancestry Free Trial
- Hosted at Census Guide