Harbor Island, SC ZIP Codes
One ZIP code serves Harbor Island, South Carolina: 29920. Together they are home to 10,606 residents in 4,486 households. That is more than the 303 people counted inside Harbor Island Census-designated place, because these ZIP codes reach past its boundary.
Harbor Island Census-designated place
| Measure | Census figure |
|---|---|
| Residents | 303 |
| Households | 143 |
| Median household income | $105,425 |
| Median home value | $366,100 |
| Median age | 69.6 |
| Median rent | not published |
All 1 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 10,606 |
| Households (sum of ZIP codes) | 4,486 |
| Median household income, range across ZIP codes | $77,744 (29920) to $77,744 (29920) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $77,744 |
| Homeowners | 90.3% |
| Households with kids under 18 | 23.2% |
| Moved in the past year | 9.0% |
| Carrier routes in EDDM2GO's route library | 9 routes, 6,443 homes (1 of 1 ZIP codes) |
Every ZIP code in Harbor Island
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 29920 | Saint Helena Island | 10,606 | 4,486 | $77,744 | $288,700 | 90.3% | 23.2% | 9.0% | 9 | 6,528 | 1% of its land |
A ZIP code is listed for Harbor Island when at least 10% of its land lies inside the Harbor Island Census-designated place, when it holds at least 10% of the place's land, or when its USPS mailing city is Harbor Island. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Harbor Island.
Counties
- Beaufort County — 15 ZIP codes
Price a mailing to Harbor Island ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Harbor Island, SC?
- 29920. A ZIP code is listed for Harbor Island when at least 10% of its land lies inside the Harbor Island Census-designated place, when it holds at least 10% of the place's land, or when its USPS mailing city is Harbor Island.
- What is the population of Harbor Island, SC?
- The Census Bureau counts 303 residents inside Harbor Island Census-designated place (ACS 2020–2024). The 1 ZIP code that serve Harbor Island hold 10,606 residents in all.
- What is the median household income in Harbor Island, SC?
- $105,425 inside Harbor Island Census-designated place, per the Census Bureau. Across its ZIP codes the medians run from $77,744 to $77,744.
- How many carrier routes and mailboxes are in Harbor Island, SC?
- For the 1 of 1 ZIP codes in EDDM2GO's stored route library: 9 carrier routes reaching 6,443 residential and 85 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.