| ZIP Codes: | 43 ZIP Codes (24 Standard, 17 PO Box, 2 Unique) [See All] |
| Area Codes: | 404 / 470 / 678 / 770 / 943 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:11:43 PM |
| Population: | 768,335 [See All] |
| FIPS: | 13089 |
| CBSA: | Atlanta-Sandy Springs-Roswell, GA |
| Land Area: | 281 sq mi |
| Water Area: | 4 sq mi |
| Coordinates: | 33.8140, -84.2632 |
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768,335 residents live across 43 ZIPs covering 281 sq mi, served by 11 distinct USPS-recognized cities.
Population moved from 710,316 to 768,335 from 2014 to 2024 — a +8.2% change. 20 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 30338 (Atlanta, $135,148 median) and poorest ZIP 30021 (Clarkston, $52,278) are 10.3 miles apart — a 2.6× income gap across local geography.
Median home values vary 3.2× across this county — from $238,700 in 30088 (Stone Mountain) to $762,500 in 30319 (Atlanta).
Density varies 6× across the county — from 1,327 people/sq mi in 30294 (Ellenwood) to 7,837 in 30021 (Clarkston).
Most of the decade's growth concentrated around Atlanta — top growth ZIPs averaged +37.9% over the past ten years ( 30079 , 30317 and 30319 ).
Educational attainment ranges from 24.5% bachelor's+ in 30021 (Clarkston) to 77.0% in 30319 (Atlanta) — the breadth of educational profiles across the area.
Within Georgia, this is the #4 most populous of 161 counties and ranks #20 for median household income with the #52 fastest decade growth .
On the national stage, Dekalb County is the #86 most populous US county .
Weighted by population, the typical household earns about $84,161 across the county — reflecting what a typical resident sees, not a simple ZIP average.
45.4% of adults age 25+ hold a bachelor's degree or higher (239,300 of 527,499 reporting). The most-educated ZIPs cluster around Atlanta.
24 Standard delivery, 17 PO Box only, 2 single-entity Unique ZIPs serve this county.
8 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 30083 | Stone Mountain | Standard | 62,724 | $55,307 | 18.6 | 16.3% |
| 30058 | Lithonia | Standard | 62,614 | $61,684 | 31.0 | 17.6% |
| 30319 | Atlanta | Standard | 45,985 | $130,648 | 10.0 | 20.6% |
| 30038 | Lithonia | Standard | 43,776 | $73,694 | 29.3 | 9.0% |
| 30032 | Decatur | Standard | 42,948 | $62,765 | 13.7 | -11.3% |
| 30294 | Ellenwood | Standard | 41,983 | $79,762 | 31.6 | 8.8% |
| 30034 | Decatur | Standard | 41,847 | $63,517 | 17.0 | -5.1% |
| 30338 | Atlanta | Standard | 39,465 | $135,148 | 9.9 | 18.0% |
| 30087 | Stone Mountain | Standard | 38,977 | $96,491 | 23.0 | 8.5% |
| 30084 | Tucker | Standard | 38,242 | $81,304 | 15.0 | 5.6% |
| 30341 | Atlanta | Standard | 36,021 | $86,313 | 10.4 | 13.0% |
| 30030 | Decatur | Standard | 31,756 | $126,830 | 6.7 | 20.0% |
| 30033 | Decatur | Standard | 31,310 | $111,616 | 8.9 | 3.3% |
| 30340 | Atlanta | Standard | 30,062 | $62,748 | 8.3 | -3.4% |
| 30088 | Stone Mountain | Standard | 29,240 | $70,325 | 7.9 | 7.7% |
| 30021 | Clarkston | Standard | 27,781 | $52,278 | 3.5 | 11.7% |
| 30329 | Atlanta | Standard | 27,278 | $76,579 | 5.4 | -1.2% |
| 30345 | Atlanta | Standard | 24,492 | $112,054 | 7.2 | 5.5% |
| 30035 | Decatur | Standard | 21,569 | $66,799 | 8.6 | 4.2% |
| 30360 | Atlanta | Standard | 16,855 | $97,543 | 6.4 | 8.7% |
| 30317 | Atlanta | Standard | 15,622 | $107,955 | 3.6 | 26.8% |
| 30002 | Avondale Estates | Standard | 5,225 | $89,750 | 1.7 | -11.8% |
| 30079 | Scottdale | Standard | 4,831 | $82,500 | 1.3 | 66.3% |
| 30346 | Atlanta | Standard | 4,411 | $95,000 | 1.0 | -14.7% |
| 30322 | Atlanta | Unique | 2,521 | — | 0.5 | 3.7% |
| 30072 | Pine Lake | PO Box | 800 | $78,750 | 0.2 | 18.7% |
| 30031 | Decatur | PO Box | — | — | 0.0 | — |
| 31107 | Atlanta | PO Box | — | — | 0.0 | — |
| 30074 | Redan | PO Box | — | — | 0.0 | — |
| 30037 | Decatur | PO Box | — | — | 0.0 | — |
| 30036 | Decatur | PO Box | — | — | 0.0 | — |
| 30333 | Atlanta | PO Box | — | — | 0.0 | — |
| 30086 | Stone Mountain | PO Box | — | — | 0.0 | — |
| 30359 | Atlanta | PO Box | — | — | 0.0 | — |
| 31145 | Atlanta | PO Box | — | — | 0.0 | — |
| 31119 | Atlanta | PO Box | — | — | 0.0 | — |
| 30085 | Tucker | PO Box | — | — | 0.0 | — |
| 39901 | Atlanta | Unique | — | — | 0.0 | — |
| 31141 | Atlanta | PO Box | — | — | 0.0 | — |
| 30362 | Atlanta | PO Box | — | — | 0.0 | — |
| 30366 | Atlanta | PO Box | — | — | 0.0 | — |
| 31146 | Atlanta | PO Box | — | — | 0.0 | — |
| 30356 | Atlanta | PO Box | — | — | 0.0 | — |