| ZIP Codes: | 33 ZIP Codes (27 Standard, 6 PO Box, 0 Unique) [See All] |
| Area Codes: | 423 / 729 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:46 PM |
| Population: | 379,809 [See All] |
| FIPS: | 47065 |
| CBSA: | Chattanooga, TN-GA |
| Land Area: | 676 sq mi |
| Water Area: | 42 sq mi |
| Coordinates: | 35.1048, -85.2215 |
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379,809 residents live across 33 ZIPs covering 676 sq mi, served by 13 distinct USPS-recognized cities.
Population moved from 346,034 to 379,809 from 2014 to 2024 — a +9.8% change. 21 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 37350 (Lookout Mountain, $201,000 median) and poorest ZIP 37402 (Chattanooga, $24,214) are 3.9 miles apart — a 8.3× income gap across local geography.
Median home values vary 8.6× across this county — from $98,900 in 37407 (Chattanooga) to $855,300 in 37350 (Lookout Mountain).
Density varies 3363× across the county — from 74 people/sq mi in 37308 (Birchwood) to 250,000 in 37315 (Collegedale).
Educational attainment ranges from 7.8% bachelor's+ in 37407 (Chattanooga) to 86.8% in 37350 (Lookout Mountain) — the breadth of educational profiles across the area.
Within Tennessee, this is the #4 most populous of 95 counties and ranks #15 for median household income with the #25 fastest decade growth .
Weighted by population, the typical household earns about $79,137 across the county — reflecting what a typical resident sees, not a simple ZIP average.
37.3% of adults age 25+ hold a bachelor's degree or higher (99,796 of 267,889 reporting).
27 Standard delivery, 6 PO Box only, 0 single-entity Unique ZIPs serve this county.
1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
Median household income spans 8.3× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 37421 | Chattanooga | Standard | 52,985 | $82,517 | 31.6 | 11.8% |
| 37343 | Hixson | Standard | 45,101 | $82,227 | 45.6 | 10.2% |
| 37363 | Ooltewah | Standard | 42,093 | $97,399 | 61.7 | 19.6% |
| 37379 | Soddy Daisy | Standard | 29,430 | $88,875 | 112.3 | 9.4% |
| 37415 | Chattanooga | Standard | 24,181 | $70,972 | 19.2 | 1.0% |
| 37412 | Chattanooga | Standard | 21,864 | $62,508 | 8.4 | 2.9% |
| 37411 | Chattanooga | Standard | 18,997 | $56,579 | 7.4 | 4.8% |
| 37405 | Chattanooga | Standard | 18,109 | $81,337 | 56.9 | 17.5% |
| 37377 | Signal Mountain | Standard | 17,188 | $119,636 | 81.8 | 11.8% |
| 37341 | Harrison | Standard | 15,591 | $92,120 | 44.0 | 19.5% |
| 37404 | Chattanooga | Standard | 14,737 | $56,637 | 5.1 | 23.0% |
| 37416 | Chattanooga | Standard | 13,919 | $70,705 | 23.1 | -7.7% |
| 37406 | Chattanooga | Standard | 13,364 | $44,850 | 13.2 | -6.2% |
| 37407 | Chattanooga | Standard | 9,156 | $35,845 | 3.4 | -6.7% |
| 37403 | Chattanooga | Standard | 6,413 | $81,136 | 1.7 | 2.3% |
| 37419 | Chattanooga | Standard | 5,980 | $74,787 | 45.3 | 2.7% |
| 37302 | Apison | Standard | 5,082 | $128,885 | 17.1 | 40.3% |
| 37410 | Chattanooga | Standard | 4,129 | $28,708 | 3.0 | -7.3% |
| 37402 | Chattanooga | Standard | 3,953 | $24,214 | 1.3 | 7.7% |
| 37408 | Chattanooga | Standard | 3,502 | $81,250 | 2.5 | 140.0% |
| 37409 | Chattanooga | Standard | 3,357 | $74,754 | 4.5 | 12.2% |
| 37373 | Sale Creek | Standard | 3,273 | $54,974 | 42.2 | 18.6% |
| 37308 | Birchwood | Standard | 3,188 | $80,394 | 42.9 | 25.8% |
| 37350 | Lookout Mountain | Standard | 2,111 | $201,000 | 1.4 | 12.4% |
| 37315 | Collegedale | PO Box | 1,825 | — | 0.0 | 39.5% |
| 37351 | Lupton City | Standard | 281 | $50,250 | 0.5 | -45.8% |
| 37450 | Chattanooga | Standard | 0 | — | 0.0 | — |
| 37401 | Chattanooga | PO Box | — | — | 0.0 | — |
| 37422 | Chattanooga | PO Box | — | — | 0.0 | — |
| 37414 | Chattanooga | PO Box | — | — | 0.0 | — |
| 37424 | Chattanooga | PO Box | — | — | 0.0 | — |
| 37384 | Soddy Daisy | PO Box | — | — | 0.0 | — |
| 37304 | Bakewell | Standard | — | — | 0.0 | — |