County ZIP codes · Georgia · FIPS 13067
Cobb County, GA ZIP Codes
Cobb County, Georgia has 31 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 21 residential and 10 for PO boxes or a single organization. 19 of the residential ones lie mainly in Cobb County and 2 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $64,059 in 30168 (Austell) to $157,335 in 30075 (Roswell) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Cobb 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 $83,568 and $120,372.
They carry 10 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 21 residential ZIP codes in Cobb County
19 ZIP codes lie mainly in Cobb County; 2 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 30127 | Powder Springs | 71,626 | 1,396 | $111k | $359k | 85% |
| 30101 | Acworth | 62,593 | 1,528 | $111k | $412k | 68% |
| 30062 | Marietta | 62,284 | 2,407 | $133k | $491k | 100% |
| 30066 | Marietta | 61,761 | 2,274 | $116k | $403k | 100% |
| 30144 | Kennesaw | 59,661 | 2,696 | $89k | $346k | 100% |
| 30080 | Smyrna | 53,316 | 4,227 | $92k | $450k | 100% |
| 30064 | Marietta | 52,125 | 1,697 | $122k | $467k | 100% |
| 30067 | Marietta | 47,271 | 3,290 | $84k | $446k | 100% |
| 30152 | Kennesaw | 44,977 | 2,015 | $127k | $428k | 100% |
| 30126 | Mableton | 41,829 | 2,041 | $102k | $377k | 100% |
| 30060 | Marietta | 38,499 | 2,483 | $68k | $316k | 100% |
| 30008 | Marietta | 35,547 | 3,725 | $75k | $308k | 100% |
| 30339 | Atlanta | 35,372 | 3,586 | $103k | $466k | 96% |
| 30068 | Marietta | 33,882 | 2,353 | $150k | $599k | 100% |
| 30082 | Smyrna | 27,296 | 2,595 | $120k | $439k | 100% |
| 30168 | Austell | 26,612 | 2,150 | $64k | $242k | 90% |
| 30106 | Austell | 23,107 | 1,833 | $69k | $288k | 98% |
| 30090 | Marietta | no residents | 0 | – | – | 100% |
| 30111 | Clarkdale | no residents | 0 | – | – | 100% |
Partly in Cobb County
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?
7 ZIP codes of Cobb County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Cobb | Elsewhere |
|---|---|---|
| 30127 | 85% | Paulding County 15% |
| 30101 | 68% | Paulding County 26%; Bartow County 5% |
| 30075 | 14% | Fulton County 84%; Cherokee County 2% |
| 30102 | 11% | Cherokee County 50%; Bartow County 39% |
| 30339 | 96% | Fulton County 4% |
| 30168 | 90% | Douglas County 10% |
| 30106 | 98% | Douglas County 2% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Cobb County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Cobb County's ZIP codes use 4 prefixes: 300, 301, 303 and 311.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 300 | North Metro, GA (SCF 300) | 18 | 89 |
| 301 | Atlanta, GA (SCF 303) | 11 | 77 |
| 303 | Atlanta, GA (SCF 303) | 1 | 75 |
| 311 | Atlanta, GA (SCF 303) | 1 | 18 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.