ZIP code · Johns Island · South Carolina · United States

ZIP code 29457 — Johns Island

ZIP code 29457 serves Johns Island, South Carolina.

Postal code: 29457
Single source Value from one source, not cross-checked.
City: Johns Island
County: Charleston
State: South Carolina
Country: United States
Coordinates: 32.7924, -80.1081 — precision precise (locality)
View on OpenStreetMap
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 codes: 843, 854 (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 29457 with another ZIP · ZIPs within 25 miles · distance from 29457

Climate — monthly normals

Warmest month Jul (avg high 91°F), coldest Jan (avg low 39°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	60	64	70	77	84	89	91	90	85	78	69	63
Avg low °F	39	42	47	55	63	70	74	73	68	58	47	42
Precip in	3.4	3.0	3.4	3.3	3.3	6.2	6.6	7.0	6.0	4.3	2.7	3.4

NOAA 1991–2020 climate normals from the nearest station: CHARLESTON INTL AP (8.3 mi) · NOAA NCEI

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 · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page