| Official Name: | St. Johns, Arizona |
| Settlement Type: | Census-designated place |
| Mapsize: | 250px |
| Pushpin Map: | Arizona#USA |
| Pushpin Label: | St. Johns |
| Pushpin Label Position: | top |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name: | United States |
| Subdivision Name1: | Arizona |
| Subdivision Name2: | Maricopa |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 2.28 |
| Area Land Sq Mi: | 2.28 |
| Area Water Sq Mi: | 0.0 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 690 |
| Population Density Sq Mi: | 302.5 |
| Timezone: | MST (no DST) |
| Utc Offset: | -7 |
| Elevation Ft: | 1011 |
| Coordinates: | 33.3044°N -112.1947°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 85339 (Laveen) |
| Blank Name: | FIPS code |
| Blank Info: | 04-62362 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2612144 |
St. Johns is a census-designated place (CDP) in Maricopa County, Arizona, United States, located in the Gila River Indian Community. The population was 690 at the 2020 census,[2] up from 476 at the 2010 census.
St. Johns is on the south side of the Phoenix metropolitan area, on the northeast side of the valley of the Gila River. It is bordered to the southeast by the communities of Komatke and Gila Crossing. Downtown Phoenix is to the northeast.
As of the census[3] of 2010, there were 476 people living in the CDP. The population density was 208.7 people per square mile. The racial makeup of the CDP was 3% White, <1% Black or African American, 95% Native American, 1% from other races, and 1% from two or more races. 4% of the population were Hispanic or Latino of any race.