Maricopa County was formed in 1871 from Pima, Yavapai, and Yuma Counties.
- Pima County, Arizona Census Records
- Yavapai County, Arizona Census Records
- Yuma County, Arizona Census Records
1880 Maricopa County, Arizona Census
- Free 1880 Census Form for your Research
- Hosted at Maricopa County, Arizona USGenWeb Archives
- 1880 Census ED 16 (File 1 of 4)
- 1880 Census ED 16 (File 2 of 4)
- 1880 Census ED 16 (File 3 of 4)
- 1880 Census ED 16 (File 4 of 4)
- 1880 Census ED 17 (File 1 of 2)
- 1880 Census ED 17 (File 2 of 2)
- 1880 Census ED 18 (File 1 of 9)
- 1880 Census ED 18 (File 2 of 9)
- 1880 Census ED 18 (File 3 of 9)
- 1880 Census ED 18 (File 4 of 9)
- 1880 Census ED 18 (File 5 of 9)
- 1880 Census ED 18 (File 6 of 9)
- 1880 Census ED 18 (File 7 of 9)
- 1880 Census ED 18 (File 8 of 9)
- 1880 Census ED 18 (File 9 of 9)
- 1880 Census ED 19 (File 1 of 3)
- 1880 Census ED 19 (File 2 of 3)
- 1880 Census ED 19 (File 3 of 3)
- 1880 Census ED 20 (File 1 of 2)
- 1880 Census ED 20 (File 2 of 2)
- Hosted at Maricopa County USGenWeb
- 1880 Census Part 1 (large file)
- 1880 Census Part 2 (large file)
- 1880 Census Part 3 (large file)
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
1890 Maricopa County, Arizona Census
- Free 1890 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
1900 Maricopa County, Arizona Census
- Free 1900 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
1910 Maricopa County, Arizona Census
- Free 1910 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
1920 Maricopa County, Arizona Census
- Free 1920 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide
1930 Maricopa County, Arizona Census
- Free 1930 Census Form for your Research
- Hosted at Ancestry.com – 14 Days Free
- Hosted at Census Guide