| ZIP Codes: | 13 ZIP Codes (10 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Codes: | 324 / 904 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 11:52:57 PM |
| Population: | 311,914 [See All] |
| FIPS: | 12109 |
| CBSA: | Jacksonville, FL |
| Land Area: | 702 sq mi |
| Water Area: | 84 sq mi |
| Coordinates: | 29.9444, -81.4183 |
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311,914 residents live across 13 ZIPs covering 702 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 203,370 to 311,914 from 2014 to 2024 — a +53.4% change. 7 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 32259 (Saint Johns, $150,736 median) and poorest ZIP 32084 (Saint Augustine, $73,837) are 18.1 miles apart — a 2.0× income gap across local geography.
Median home values vary 3.5× across this county — from $229,200 in 32145 (Hastings) to $792,600 in 32082 (Ponte Vedra Beach).
Density varies 20× across the county — from 52 people/sq mi in 32145 (Hastings) to 1,050 in 32259 (Saint Johns).
Most of the decade's growth concentrated around Saint Augustine — top growth ZIPs averaged +228.8% over the past ten years ( 32081 , 32095 and 32092 ).
Educational attainment ranges from 12.6% bachelor's+ in 32145 (Hastings) to 72.0% in 32081 (Ponte Vedra) — the breadth of educational profiles across the area.
Within Florida, this is the #22 most populous of 67 counties and ranks #1 for median household income with the #1 fastest decade growth .
On the national stage, Saint Johns County is and #12 for decade growth .
Weighted by population, the typical household earns about $118,372 across the county — reflecting what a typical resident sees, not a simple ZIP average.
51.0% of adults age 25+ hold a bachelor's degree or higher (114,119 of 223,759 reporting).
10 Standard delivery, 3 PO Box only, 0 single-entity Unique ZIPs serve this county.
2 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
Saint Johns County grew 53.4% over the past decade — concentrated in 5 high-growth ZIPs:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 32259 | Saint Johns | Standard | 75,016 | $150,736 | 71.4 | 82.1% |
| 32092 | Saint Augustine | Standard | 53,071 | $131,020 | 153.0 | 83.8% |
| 32084 | Saint Augustine | Standard | 37,291 | $73,837 | 46.4 | 15.9% |
| 32086 | Saint Augustine | Standard | 34,855 | $76,512 | 86.9 | 30.6% |
| 32081 | Ponte Vedra | Standard | 29,784 | $131,624 | 30.5 | 402.9% |
| 32082 | Ponte Vedra Beach | Standard | 29,289 | $124,558 | 52.2 | -3.4% |
| 32095 | Saint Augustine | Standard | 21,399 | $136,038 | 57.7 | 199.6% |
| 32080 | Saint Augustine | Standard | 20,894 | $92,531 | 20.3 | -3.0% |
| 32145 | Hastings | Standard | 5,759 | $75,557 | 109.7 | 22.2% |
| 32033 | Elkton | Standard | 4,556 | $86,185 | 74.0 | -4.9% |
| 32085 | Saint Augustine | PO Box | — | — | 0.0 | — |
| 32260 | Jacksonville | PO Box | — | — | 0.0 | — |
| 32004 | Ponte Vedra Beach | PO Box | — | — | 0.0 | — |