Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/SC/HARBOR-ISLAND

Harbor Island ZIP codes, South Carolina

No ZIP code is named for Harbor Island, SC; addresses there use a neighbouring town's name. The ZIP code covering it is 29920. Its area code is 843.

USPS city name
0 ZIP codes
Overlapping the city
1 more
Population
303
Area code
843

NANPA lists no telephone rate centre for Harbor Island itself, so these are the area codes of the nearest one, Saint Helena Island (0.0 miles). A town on an area-code boundary can differ from its neighbour.

Harbor Island in numbers

About 303 people live in Harbor Island, in 143 households. The median household income is $105,425 a year, 52% above the South Carolina median of $69,324 (US: $80,734). The median owner-occupied home is valued at $366,100 (41% above the South Carolina median). The median age is 69.6; 83.3% of adults 25 and over hold a bachelor's degree or higher (32.1% across South Carolina); the average commute takes 51 minutes.

Population303Harbor Island303
Households143Harbor Island143
Median age69.6Harbor Island69.6South Carolina40.2US 38.9
Median household income$105,425Harbor Island$105,425South Carolina$69,324US $80,734
Median home value$366,100Harbor Island$366,100South Carolina$259,000US $332,700
Bachelor's degree or higher83.3%Harbor Island83.3%South Carolina32.1%US 35.7%
Mean commute50.8 minHarbor Island50.8 minSouth Carolina25.6 minUS 26.4 min
Population density296 / sq miHarbor Island296 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Harbor Island CDP. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes covering Harbor Island

These ZIP codes cover part of Harbor Island but are addressed as somewhere else.

ZIP codes overlapping Harbor Island
ZIP City Type Population Median income Median home
29920 Saint Helena Island , SC Standard 10,606 $77,744 $288,700

Map of Harbor Island ZIP codes

29920

The ZIP codes of Harbor Island, SC, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Harbor Island

The nearest larger towns are Fripp Island (752 people, 6.6 mi), Edisto Beach (1,092 people, 9.6 mi) and Port Royal (15,579 people, 16 mi).

Towns near Harbor Island
TownPopulationDistance
Port Royal 15,579 15.7 mi
Beaufort 13,747 16.9 mi
Burton 6,912 17.7 mi
Laurel Bay 5,882 20.6 mi
Hilton Head Island 37,911 23.1 mi
Hollywood 5,382 27.4 mi
Ravenel 2,615 28.1 mi
Ridgeland 3,764 28.5 mi

More nearby: every ZIP code in Beaufort County · South Carolina ZIP codes

Cite this page

zipcodes.pro. “Harbor Island, SC ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/sc/harbor-island

Underlying data is public domain or openly licensed — sources, vintages and licences.