1870 Ada County, Idaho Census
- Free 1870 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
- Hosted at Ada County IdahoUSGenWeb Census Project)
- Hosted at USGenWeb Idaho Archives)
1880 Ada County, Idaho Census
- Free 1880 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
1890 Ada County, Idaho Census
- Free 1890 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
1900 Ada County, Idaho Census
- Free 1900 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
1910 Ada County, Idaho Census
- Free 1910 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
1920 Ada County, Idaho Census
- Free 1920 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
1930 Ada County, Idaho Census
- Free 1930 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide