| ZIP Codes: | 73 ZIP Codes (36 Standard, 25 PO Box, 12 Unique) [See All] |
| Area Code: | 502 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:12:19 PM |
| Population: | 809,701 [See All] |
| FIPS: | 21111 |
| CBSA: | Louisville/Jefferson County, KY-IN |
| Land Area: | 442 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 38.2085, -85.6953 |
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809,701 residents live across 73 ZIPs covering 442 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 778,479 to 809,701 from 2014 to 2024 — a +4.0% change. 24 ZIPs gained residents, 13 lost (and 1 held flat).
The county's wealthiest ZIP 40059 (Prospect, $152,727 median) and poorest ZIP 40203 (Louisville, $30,794) are 13.6 miles apart — a 5.0× income gap across local geography.
Median home values vary 6.4× across this county — from $87,600 in 40212 (Louisville) to $559,300 in 40059 (Prospect).
Density varies 23× across the county — from 281 people/sq mi in 40023 (Fisherville) to 6,459 in 40208 (Louisville).
Educational attainment ranges from 8.4% bachelor's+ in 40210 (Louisville) to 70.1% in 40059 (Prospect) — the breadth of educational profiles across the area.
Within Kentucky, this is the #1 most populous of 120 counties and ranks #9 for median household income .
On the national stage, Jefferson County is the #80 most populous US county .
Hosts 4 single-entity Unique ZIPs: 40292Univ Of Louisville ; 40280So Baptist Theo Sem ; 40282Pleasure Ridge Park ; and 40297Louisville .
Weighted by population, the typical household earns about $74,793 across the county — reflecting what a typical resident sees, not a simple ZIP average.
37.0% of adults age 25+ hold a bachelor's degree or higher (207,795 of 562,146 reporting). The most-educated ZIPs cluster around Louisville.
36 Standard delivery, 25 PO Box only, 12 single-entity Unique ZIPs serve this county.
4 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
12 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 5.0× 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 |
|---|---|---|---|---|---|---|
| 40214 | Louisville | Standard | 45,405 | $54,931 | 15.0 | -0.8% |
| 40216 | Louisville | Standard | 44,047 | $56,441 | 17.6 | 7.8% |
| 40299 | Louisville | Standard | 42,207 | $89,440 | 54.5 | 8.4% |
| 40229 | Louisville | Standard | 41,299 | $79,936 | 17.9 | 13.0% |
| 40291 | Louisville | Standard | 41,222 | $81,267 | 23.3 | 17.4% |
| 40219 | Louisville | Standard | 39,909 | $55,720 | 14.5 | 0.7% |
| 40245 | Louisville | Standard | 39,835 | $122,948 | 33.6 | 24.7% |
| 40272 | Louisville | Standard | 38,289 | $69,940 | 35.9 | -1.2% |
| 40220 | Louisville | Standard | 35,078 | $78,434 | 7.6 | 3.3% |
| 40218 | Louisville | Standard | 33,736 | $58,811 | 9.1 | 11.7% |
| 40241 | Louisville | Standard | 30,696 | $94,078 | 13.6 | 2.6% |
| 40207 | Louisville | Standard | 28,903 | $101,898 | 12.5 | -4.4% |
| 40258 | Louisville | Standard | 26,841 | $68,162 | 13.1 | -1.4% |
| 40205 | Louisville | Standard | 24,664 | $99,966 | 7.2 | 2.5% |
| 40223 | Louisville | Standard | 22,798 | $96,607 | 12.4 | 6.1% |
| 40222 | Louisville | Standard | 21,470 | $82,511 | 11.8 | 1.2% |
| 40059 | Prospect | Standard | 20,892 | $152,727 | 32.7 | 17.5% |
| 40215 | Louisville | Standard | 20,532 | $43,725 | 3.5 | -8.1% |
| 40211 | Louisville | Standard | 20,407 | $31,749 | 6.9 | -13.6% |
| 40206 | Louisville | Standard | 20,161 | $75,798 | 7.0 | 4.6% |
| 40228 | Louisville | Standard | 18,085 | $79,404 | 8.6 | 13.0% |
| 40203 | Louisville | Standard | 17,742 | $30,794 | 3.2 | -3.3% |
| 40213 | Louisville | Standard | 16,054 | $55,897 | 10.4 | 1.4% |
| 40208 | Louisville | Standard | 15,605 | $39,560 | 2.4 | 0.8% |
| 40212 | Louisville | Standard | 14,661 | $35,753 | 6.2 | -15.3% |
| 40204 | Louisville | Standard | 14,034 | $71,116 | 2.9 | -1.4% |
| 40210 | Louisville | Standard | 13,518 | $35,347 | 3.2 | -11.4% |
| 40243 | Louisville | Standard | 12,002 | $77,587 | 3.9 | 13.6% |
| 40217 | Louisville | Standard | 11,663 | $69,114 | 2.5 | -10.8% |
| 40242 | Louisville | Standard | 11,168 | $75,417 | 2.7 | -1.5% |
| 40118 | Fairdale | Standard | 10,697 | $59,316 | 15.1 | 9.5% |
| 40202 | Louisville | Standard | 7,261 | $35,584 | 2.5 | 12.3% |
| 40023 | Fisherville | Standard | 6,870 | $144,635 | 24.4 | 49.4% |
| 40209 | Louisville | Standard | 639 | — | 4.2 | 31.8% |
| 40025 | Glenview | PO Box | 565 | $250,001 | 0.2 | 874.1% |
| 40041 | Masonic Home | Standard | 564 | $153,214 | 0.1 | 103.6% |
| 40280 | Louisville | Unique | 182 | — | 0.0 | -66.0% |
| 40231 | Louisville | PO Box | 0 | — | 0.1 | — |
| 40221 | Louisville | PO Box | 0 | — | 0.0 | — |
| 40293 | Louisville | Standard | — | — | 0.0 | — |
| 40259 | Louisville | PO Box | — | — | 0.0 | — |
| 40282 | Louisville | Unique | — | — | 0.0 | — |
| 40268 | Louisville | PO Box | — | — | 0.0 | — |
| 40297 | Louisville | Unique | — | — | 0.0 | — |
| 40294 | Louisville | Unique | — | — | 0.0 | — |
| 40285 | Louisville | PO Box | — | — | 0.0 | — |
| 40289 | Louisville | Unique | — | — | 0.0 | — |
| 40283 | Louisville | Unique | — | — | 0.0 | — |
| 40257 | Louisville | PO Box | — | — | 0.0 | — |
| 40287 | Louisville | Unique | — | — | 0.0 | — |
| 40269 | Louisville | PO Box | — | — | 0.0 | — |
| 40224 | Louisville | PO Box | — | — | 0.0 | — |
| 40290 | Louisville | PO Box | — | — | 0.0 | — |
| 40292 | Louisville | Unique | — | — | 0.2 | — |
| 40232 | Louisville | PO Box | — | — | 0.0 | — |
| 40252 | Louisville | PO Box | — | — | 0.0 | — |
| 40296 | Louisville | Unique | — | — | 0.0 | — |
| 40298 | Louisville | PO Box | — | — | 0.0 | — |
| 40295 | Louisville | PO Box | — | — | 0.0 | — |
| 40027 | Harrods Creek | PO Box | — | — | 0.0 | — |
| 40255 | Louisville | PO Box | — | — | 0.0 | — |
| 40201 | Louisville | PO Box | — | — | 0.0 | — |
| 40261 | Louisville | PO Box | — | — | 0.0 | — |
| 40281 | Louisville | Unique | — | — | 0.0 | — |
| 40256 | Louisville | PO Box | — | — | 0.0 | — |
| 40250 | Louisville | PO Box | — | — | 0.0 | — |
| 40018 | Eastwood | PO Box | — | — | 0.0 | — |
| 40266 | Louisville | Unique | — | — | 0.0 | — |
| 40251 | Louisville | PO Box | — | — | 0.0 | — |
| 40253 | Louisville | PO Box | — | — | 0.0 | — |
| 40270 | Louisville | PO Box | — | — | 0.0 | — |
| 40225 | Louisville | Unique | — | — | 0.0 | — |
| 40233 | Louisville | PO Box | — | — | 0.0 | — |