ZIP codes

ZIP codes in Cobb County, Georgia

Cobb County has 21 ZIP codes. 14 lie entirely inside it and 7 are shared with neighboring counties, so part of their land and their people are elsewhere. About 777,806 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 21; 4 more just touch the border (under 1% of their land)
Entirely inside: 14; 99% or more of their land
Shared with other counties: 7; Most with Bartow County (2)
Most populated ZIP: 30127; 71,626 people · Powder Springs
Least populated ZIP: 30106; 23,107 people · Austell; 2 more with nobody living there
Largest ZIP by land: 30127; 51 sq mi · Powder Springs

Map of the ZIP codes in Cobb County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Cobb County

21 ZIP codes in Cobb County, GA, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
30008	Marietta	35,547	100%	35,547
30060	Marietta	38,499	100%	38,499
30062	Marietta	62,284	100%	62,284
30064	Marietta	52,125	100%	52,125
30066	Marietta	61,761	100%	61,761
30067	Marietta	47,271	100%	47,271
30068	Marietta	33,882	100%	33,882
30075	Roswell	56,263	14%	≈ 11,143
30080	Smyrna	53,316	100%	53,316
30082	Smyrna	27,296	100%	27,296
30090	Marietta	0	100%	0
30101	Acworth	62,593	68%	≈ 48,777
30102	—	45,319	11%	≈ 10,772
30106	Austell	23,107	98%	≈ 22,680
30111	Austell	0	100%	0
30126	Mableton	41,829	100%	41,829
30127	Powder Springs	71,626	85%	≈ 63,437
30144	Kennesaw	59,661	100%	59,661
30152	Kennesaw	44,977	100%	44,977
30168	Mableton	26,612	90%	≈ 24,747
30339	Vinings	35,372	96%	≈ 34,973

They also touch the county with under 1% of their land, so they aren’t counted: 30122, 30141, 30157, and 30188.

ZIP codes shared with other counties

These 7 ZIP codes have part of their land in another county. The first figure is the share of their land in Cobb County; then, where the rest lies.

30075 (Roswell): 14% here; 84% in Fulton County and 1.7% in Cherokee County.
30101 (Acworth): 68% here; 26% in Paulding County and 4.9% in Bartow County.
30102: 11% here; 50% in Cherokee County and 39% in Bartow County.
30106 (Austell): 98% here; 2.3% in Douglas County.
30127 (Powder Springs): 85% here; 15% in Paulding County.
30168 (Mableton): 90% here; 9.7% in Douglas County.
30339 (Vinings): 96% here; 4.4% in Fulton County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Marietta (8), Austell (2), Kennesaw (2), Mableton (2), Smyrna (2), and Acworth (1); 9 places in all.

They start with 3 different three-digit prefixes, one per USPS sorting center: 300, 301, and 303.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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