| Place Name | Port St. John |
| Place Type | Census Designated Place |
| ZIP Code(s) | 32927 |
| County | Brevard County |
| Area Code(s) | 321 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 12,286 |
| Population Growth Rate (2010-19) | 91.36% |
| Majority Ethnicity | White 87.19% |
| Metro/Micro Stats Area | Palm Bay-Melbourne-Titusville, FL |
| US Congressional District(s) | Florida 8th |
| State House Districts | 51 |
| State Senate Districts | 14 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 87.19% |
| African American | 4.81% |
| Hispanic | 0.28% |
| Asian | 1.03% |
| Native American | 0.35% |
| Hawaiin/Pacific Islander | 6.35% |