ZIP code · Sea Island · Georgia · United States
ZIP code 31561 — Sea Island
ZIP code 31561 serves Sea Island, Georgia.
- Postal code
- 31561Single source Value from one source, not cross-checked.
- City
- Sea Island
- County
- Glynn FIPS 13127
- State
- Georgia
- Country
- United States
- Coordinates
- 31.1989, -81.3322 — precision precise (locality)
View on OpenStreetMap - Population
- 94 (ZCTA, ACS 5-year)
- Population density
- 20 / sq mi
- Land area
- 4.7 sq mi (12.2 km²) (ZCTA, ACS 5-year)
- Median household income
- $144,375
- Per-capita income
- $99,904
- Median age
- 72.1
- Households
- 61
- Housing units
- 466
- Median home value
- $2,000,000+
- Congressional district
- GA-1 (119th Congress)
- USDA hardiness zone
- 9a (20 to 25 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
- Area code
- 912 (from the nearest rate centre)Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 31561 with another ZIP · ZIPs within 25 miles · distance from 31561
Map of ZIP code 31561
Climate — monthly normals
Warmest month Jul (avg high 91°F), coldest Jan (avg low 44°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 62 | 65 | 70 | 76 | 83 | 88 | 91 | 90 | 86 | 79 | 71 | 64 |
| Avg low °F | 44 | 47 | 53 | 60 | 68 | 74 | 76 | 76 | 73 | 64 | 53 | 47 |
| Precip in | 3.1 | 2.8 | 3.3 | 2.8 | 2.3 | 5.8 | 4.2 | 5.8 | 6.0 | 4.7 | 1.9 | 2.8 |
NOAA 1991–2020 climate normals from the nearest station: BRUNSWICK MALCOLM MCKINNON AP (4.7 mi) · NOAA NCEI
Places in ZIP 31561
- 1 post offices
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page