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/ROUND-O

Round O ZIP code, South Carolina

The ZIP code for Round O, SC is 29474, and its area code is 843.

USPS city name
1 ZIP code
Population
1,420
Area code
843

NANPA lists no telephone rate centre for Round O itself, so these are the area codes of the nearest one, Cottageville (4.8 miles). A town on an area-code boundary can differ from its neighbour.

Round O in numbers

About 1,420 people live in Round O, in 783 households. The median household income is $40,781 a year, 41% below the South Carolina median of $69,324 (US: $80,734). The median owner-occupied home is valued at $143,100 (45% below the South Carolina median).

Population1,420Round O1,420
Households783Round O783
Median household income$40,781Round O$40,781South Carolina$69,324US $80,734
Median home value$143,100Round O$143,100South Carolina$259,000US $332,700

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the ZIP code addressed as Round O. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Round O

ZIP codes with the USPS city name Round O
ZIP City Type Population Median income Median home
29474 Round O , SC Standard 1,420 $40,781 $143,100

Map of Round O ZIP codes

29474

The ZIP codes of Round O, 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 Round O

The nearest larger towns are Walterboro (5,480 people, 8.8 mi), Ridgeville (1,740 people, 18 mi) and Ravenel (2,615 people, 19 mi).

Towns near Round O
TownPopulationDistance
Walterboro 5,480 8.8 mi
Ravenel 2,615 19.1 mi
Summerville 51,654 21.2 mi
Hollywood 5,382 21.4 mi
Sangaree 8,681 24.8 mi
Ladson 16,140 25.2 mi
North Charleston 119,913 26.6 mi

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

Cite this page

zipcodes.pro. “Round O, SC ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/sc/round-o

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