St. Johns is a CDP located in Apache County, Arizona. St. Johns has a 2026 population of 624. It is also the county seat of Apache County. St. Johns is currently growing at a rate of 1.63% annually and its population has decreased by 0% since the most recent census, which recorded a population of 0 in 2020.
The median age in St. Johns is 35.3 years: 32.2 years for males, and 35.9 years for females. For every 100 females there are 139.9 males.
Data after 2023 is projected based on recent change
Overall: 35.3 years
Female: 35.9 years
Male: 32.2 years
There are 445 adults, (95 of whom are seniors) in St. Johns.
Female: 263 (41.7%)
Male: 368 (58.3%)
The racial composition of St. Johns includes 77.18% Native American, and smaller percentages for other race and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| Native American | 487 | 77.18% |
| Two or more races | 140 | 22.19% |
| Other race | 4 | 0.63% |