County ZIP codes · South Carolina · FIPS 45035
Dorchester County, SC ZIP Codes
Dorchester County, South Carolina has 17 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 15 residential and 2 for PO boxes or a single organization. 8 of the residential ones lie mainly in Dorchester County and 7 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $53,894 in 29477 (Saint George) to $99,529 in 29414 (Charleston) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Dorchester County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $61,821 and $82,987.
They carry 13 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 15 residential ZIP codes in Dorchester County
8 ZIP codes lie mainly in Dorchester County; 7 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 29483 | Summerville | 59,186 | 1,110 | $86k | $333k | 83% |
| 29485 | Summerville | 58,507 | 1,205 | $83k | $342k | 94% |
| 29420 | North Charleston | 23,959 | 2,392 | $73k | $332k | 60% |
| 29472 | Ridgeville | 12,722 | 67 | $75k | $263k | 60% |
| 29477 | Saint George | 7,176 | 65 | $54k | $90k | 99% |
| 29437 | Dorchester | 2,281 | 27 | $62k | $173k | 100% |
| 29448 | Harleyville | 1,997 | 34 | $72k | $195k | 100% |
| 29471 | Reevesville | 1,135 | 27 | $39k | $110k | 97% |
Partly in Dorchester County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 29470 | Ravenel | 5,639 | 78 | $86k | $345k | 34% |
| 29456 | Ladson | 41,214 | 2,281 | $78k | $270k | 25% |
| 29418 | North Charleston | 26,052 | 1,969 | $65k | $268k | 23% |
| 29414 | Charleston | 44,727 | 913 | $100k | $417k | 18% |
| 29426 | Adams Run | 1,697 | 22 | $64k | $201k | 17% |
| 29432 | Branchville | 2,424 | 20 | $55k | $158k | 7% |
| 29018 | Bowman | 3,559 | 34 | $49k | $108k | 3% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
13 ZIP codes of Dorchester County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Dorchester | Elsewhere |
|---|---|---|
| 29483 | 83% | Berkeley County 16% |
| 29485 | 94% | Charleston County 6% |
| 29414 | 18% | Charleston County 82% |
| 29456 | 25% | Charleston County 46%; Berkeley County 29% |
| 29418 | 23% | Charleston County 77% |
| 29420 | 60% | Charleston County 40% |
| 29472 | 60% | Berkeley County 32%; Colleton County 8% |
| 29477 | 99% | |
| 29470 | 34% | Charleston County 66% |
| 29018 | 3% | Orangeburg County 97% |
| 29432 | 7% | Orangeburg County 61%; Bamberg County 33% |
| 29426 | 17% | Charleston County 83% |
| 29471 | 97% | Orangeburg County 3% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 29447 | Grover |
| 29484 | Summerville |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Dorchester County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Dorchester County's ZIP codes use 2 prefixes: 290 and 294.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.