| ZIP Codes: | 79 ZIP Codes (52 Standard, 12 PO Box, 15 Unique) [See All] |
| Area Codes: | 270 / 283 / 364 / 513 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:19 PM |
| Population: | 842,501 [See All] |
| FIPS: | 39061 |
| CBSA: | Cincinnati, OH-KY-IN |
| Land Area: | 421 sq mi |
| Water Area: | 7 sq mi |
| Coordinates: | 39.1586, -84.5189 |
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842,501 residents live across 79 ZIPs covering 421 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 815,882 to 842,499 from 2014 to 2024 — a +3.3% change. 35 ZIPs gained residents, 18 lost.
The county's wealthiest ZIP 45174 (Terrace Park, $193,750 median) and poorest ZIP 45225 (Cincinnati, $20,348) are 13.4 miles apart — a 9.5× income gap across local geography.
Median home values vary 6.6× across this county — from $95,400 in 45204 (Cincinnati) to $627,000 in 45243 (Cincinnati).
Density varies 40× across the county — from 303 people/sq mi in 45052 (North Bend) to 12,101 in 45219 (Cincinnati).
Most of the decade's growth concentrated around Cincinnati — top growth ZIPs averaged +24.3% over the past ten years ( 45202 , 45030 and 45204 ).
Educational attainment ranges from 8.0% bachelor's+ in 45225 (Cincinnati) to 85.2% in 45174 (Terrace Park) — the breadth of educational profiles across the area.
Within Ohio, this is the #3 most populous of 88 counties and ranks #32 for median household income .
On the national stage, Hamilton County is the #73 most populous US county .
Hosts 4 single-entity Unique ZIPs: 45267Univ Cinc Med Sciences ; 45268Envir Pro Agency ; 45221University Of Cincinnati ; and 45999Internal Revenue Service .
Weighted by population, the typical household earns about $76,743 across the county — reflecting what a typical resident sees, not a simple ZIP average.
41.6% of adults age 25+ hold a bachelor's degree or higher (237,849 of 571,937 reporting). The most-educated ZIPs cluster around Cincinnati.
52 Standard delivery, 12 PO Box only, 15 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.
15 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 9.5× 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 |
|---|---|---|---|---|---|---|
| 45238 | Cincinnati | Standard | 48,351 | $66,277 | 10.3 | 5.0% |
| 45231 | Cincinnati | Standard | 40,463 | $71,353 | 15.1 | -0.6% |
| 45211 | Cincinnati | Standard | 38,049 | $53,868 | 9.2 | 2.0% |
| 45215 | Cincinnati | Standard | 30,586 | $69,372 | 12.0 | 0.0% |
| 45239 | Cincinnati | Standard | 29,607 | $60,324 | 6.2 | 7.4% |
| 45240 | Cincinnati | Standard | 29,600 | $71,947 | 9.6 | 7.9% |
| 45244 | Cincinnati | Standard | 28,511 | $109,287 | 22.4 | -2.3% |
| 45230 | Cincinnati | Standard | 27,501 | $89,516 | 14.6 | 3.3% |
| 45236 | Cincinnati | Standard | 24,513 | $84,037 | 7.0 | 1.1% |
| 45241 | Cincinnati | Standard | 23,955 | $103,585 | 17.5 | 4.8% |
| 45247 | Cincinnati | Standard | 23,617 | $94,603 | 21.5 | 5.8% |
| 45242 | Cincinnati | Standard | 22,623 | $124,567 | 13.5 | 2.1% |
| 45248 | Cincinnati | Standard | 22,576 | $84,510 | 11.4 | -10.5% |
| 45255 | Cincinnati | Standard | 22,313 | $92,035 | 12.9 | 4.2% |
| 45224 | Cincinnati | Standard | 21,900 | $56,471 | 5.9 | 9.2% |
| 45030 | Harrison | Standard | 21,640 | $98,598 | 42.3 | 20.6% |
| 45212 | Cincinnati | Standard | 21,526 | $72,422 | 3.7 | -2.1% |
| 45237 | Cincinnati | Standard | 20,903 | $44,913 | 6.2 | 4.0% |
| 45251 | Cincinnati | Standard | 20,254 | $74,614 | 12.0 | -7.7% |
| 45219 | Cincinnati | Standard | 20,012 | $35,657 | 1.7 | 9.9% |
| 45227 | Cincinnati | Standard | 18,893 | $71,646 | 6.0 | 5.0% |
| 45205 | Cincinnati | Standard | 18,651 | $43,682 | 2.8 | -4.1% |
| 45208 | Cincinnati | Standard | 17,943 | $137,600 | 4.3 | -4.8% |
| 45202 | Cincinnati | Standard | 17,869 | $95,633 | 3.1 | 34.8% |
| 45243 | Cincinnati | Standard | 16,103 | $171,172 | 19.4 | 10.0% |
| 45233 | Cincinnati | Standard | 15,981 | $110,742 | 11.7 | 2.6% |
| 45002 | Cleves | Standard | 15,413 | $81,229 | 27.4 | 13.7% |
| 45249 | Cincinnati | Standard | 14,490 | $105,804 | 6.7 | 8.4% |
| 45223 | Cincinnati | Standard | 14,182 | $49,312 | 4.7 | 16.0% |
| 45220 | Cincinnati | Standard | 14,109 | $53,440 | 2.7 | -5.5% |
| 45229 | Cincinnati | Standard | 13,529 | $32,263 | 2.7 | 6.2% |
| 45246 | Cincinnati | Standard | 13,527 | $65,370 | 9.6 | -9.2% |
| 45213 | Cincinnati | Standard | 11,139 | $76,356 | 3.2 | -9.8% |
| 45209 | Cincinnati | Standard | 10,570 | $93,420 | 2.2 | 11.8% |
| 45206 | Cincinnati | Standard | 10,299 | $62,648 | 1.9 | -1.2% |
| 45225 | Cincinnati | Standard | 9,583 | $20,348 | 2.8 | 9.1% |
| 45216 | Cincinnati | Standard | 9,569 | $44,099 | 3.1 | -0.8% |
| 45214 | Cincinnati | Standard | 8,630 | $27,852 | 2.8 | 9.6% |
| 45204 | Cincinnati | Standard | 8,412 | $31,236 | 3.3 | 17.4% |
| 45207 | Cincinnati | Standard | 6,983 | $49,801 | 1.2 | -7.1% |
| 45217 | Cincinnati | Standard | 6,454 | $62,200 | 2.1 | -3.3% |
| 45232 | Cincinnati | Standard | 6,363 | $28,367 | 4.3 | 0.3% |
| 45226 | Cincinnati | Standard | 5,796 | $97,558 | 6.0 | 10.9% |
| 45252 | Cincinnati | Standard | 4,684 | $84,963 | 11.5 | -2.8% |
| 45052 | North Bend | Standard | 4,236 | $101,165 | 14.0 | -1.7% |
| 45218 | Cincinnati | Standard | 3,836 | $71,000 | 1.5 | 0.5% |
| 45203 | Cincinnati | Standard | 2,436 | $21,973 | 1.3 | 8.8% |
| 45174 | Terrace Park | Standard | 2,321 | $193,750 | 1.2 | 2.8% |
| 45001 | Addyston | PO Box | 904 | $50,417 | 0.9 | 60.3% |
| 45033 | Hooven | PO Box | 377 | $42,500 | 0.3 | -2.1% |
| 45051 | Mount Saint Joseph | Standard | 334 | $66,932 | 0.0 | 88.7% |
| 45111 | Camp Dennison | Standard | 265 | $100,893 | 1.3 | -14.2% |
| 45041 | Miamitown | PO Box | 118 | — | 0.0 | 14.6% |
| 45267 | Cincinnati | Unique | 2 | — | 0.0 | — |
| 45258 | Cincinnati | PO Box | — | — | 0.0 | — |
| 45235 | Cincinnati | Standard | — | — | 0.0 | — |
| 45268 | Cincinnati | Unique | — | — | 0.0 | — |
| 45221 | Cincinnati | Unique | — | — | 0.0 | — |
| 45234 | Cincinnati | Standard | — | — | 0.0 | — |
| 45275 | Cincinnati | PO Box | — | — | 0.0 | — |
| 45201 | Cincinnati | PO Box | — | — | 0.0 | — |
| 45250 | Cincinnati | PO Box | — | — | 0.0 | — |
| 45254 | Cincinnati | PO Box | — | — | 0.0 | — |
| 45999 | Cincinnati | Unique | — | — | 0.0 | — |
| 45298 | Cincinnati | Unique | — | — | 0.0 | — |
| 45270 | Cincinnati | Unique | — | — | 0.0 | — |
| 45273 | Cincinnati | Unique | — | — | 0.0 | — |
| 45299 | Cincinnati | Unique | — | — | 0.0 | — |
| 45269 | Cincinnati | Unique | — | — | 0.0 | — |
| 45271 | Cincinnati | Unique | — | — | 0.0 | — |
| 45277 | Cincinnati | Unique | — | — | 0.0 | — |
| 45263 | Cincinnati | Unique | — | — | 0.0 | — |
| 45280 | Cincinnati | PO Box | — | — | 0.0 | — |
| 45274 | Cincinnati | Unique | — | — | 0.0 | — |
| 45296 | Cincinnati | Unique | — | — | 0.0 | — |
| 45264 | Cincinnati | Unique | — | — | 0.0 | — |
| 45253 | Cincinnati | PO Box | — | — | 0.0 | — |
| 45222 | Cincinnati | PO Box | — | — | 0.0 | — |
| 45262 | Cincinnati | PO Box | — | — | 0.0 | — |