| ZIP Codes: | 33 ZIP Codes (25 Standard, 6 PO Box, 2 Unique) [See All] |
| Area Codes: | 484 / 610 / 835 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:32 PM |
| Population: | 358,762 [See All] |
| FIPS: | 42077 |
| CBSA: | Allentown-Bethlehem-Easton, PA-NJ |
| Land Area: | 341 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 40.5967, -75.5518 |
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358,762 residents live across 33 ZIPs covering 341 sq mi, served by 24 distinct USPS-recognized cities.
Population moved from 334,156 to 358,185 from 2014 to 2024 — a +7.2% change. 19 ZIPs gained residents, 7 lost (and 1 held flat).
The county's wealthiest ZIP 18034 (Center Valley, $153,200 median) and poorest ZIP 18102 (Allentown, $43,085) are 5.4 miles apart — a 3.6× income gap across local geography.
Median home values vary 2.9× across this county — from $163,400 in 18102 (Allentown) to $475,900 in 18034 (Center Valley).
Density varies 198× across the county — from 127 people/sq mi in 18053 (Germansville) to 25,196 in 18101 (Allentown).
Educational attainment ranges from 11.6% bachelor's+ in 18102 (Allentown) to 53.5% in 18031 (Breinigsville) — the breadth of educational profiles across the area.
Within Pennsylvania, this is the #10 most populous of 67 counties and ranks #5 for median household income with the #3 fastest decade growth .
Weighted by population, the typical household earns about $85,741 across the county — reflecting what a typical resident sees, not a simple ZIP average.
33.7% of adults age 25+ hold a bachelor's degree or higher (82,927 of 246,171 reporting).
25 Standard delivery, 6 PO Box only, 2 single-entity Unique ZIPs serve this county.
Median household income spans 3.6× 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 |
|---|---|---|---|---|---|---|
| 18102 | Allentown | Standard | 51,001 | $43,085 | 3.2 | 5.7% |
| 18103 | Allentown | Standard | 48,746 | $72,895 | 17.3 | 0.8% |
| 18104 | Allentown | Standard | 48,683 | $94,601 | 23.5 | 13.0% |
| 18052 | Whitehall | Standard | 29,451 | $75,665 | 12.9 | 8.5% |
| 18062 | Macungie | Standard | 27,110 | $110,675 | 21.8 | 8.0% |
| 18049 | Emmaus | Standard | 18,941 | $93,694 | 15.1 | 8.9% |
| 18109 | Allentown | Standard | 18,446 | $58,031 | 8.2 | 11.4% |
| 18036 | Coopersburg | Standard | 15,581 | $129,123 | 29.6 | 21.9% |
| 18031 | Breinigsville | Standard | 11,570 | $113,625 | 14.5 | 45.0% |
| 18080 | Slatington | Standard | 11,226 | $74,522 | 30.6 | -3.1% |
| 18032 | Catasauqua | Standard | 9,555 | $81,098 | 2.3 | 2.5% |
| 18034 | Center Valley | Standard | 9,209 | $153,200 | 11.4 | 8.0% |
| 18069 | Orefield | Standard | 8,515 | $117,895 | 14.0 | 5.7% |
| 18078 | Schnecksville | Standard | 7,857 | $120,857 | 15.9 | 8.4% |
| 18037 | Coplay | Standard | 7,472 | $83,542 | 7.7 | 2.0% |
| 18106 | Allentown | Standard | 6,226 | $92,813 | 8.0 | -13.6% |
| 18101 | Allentown | Standard | 6,120 | $44,773 | 0.2 | 24.1% |
| 18066 | New Tripoli | Standard | 6,102 | $109,115 | 44.1 | 7.4% |
| 18011 | Alburtis | Standard | 5,338 | $104,449 | 16.5 | -5.1% |
| 18051 | Fogelsville | Standard | 3,624 | $139,506 | 8.0 | -7.4% |
| 18092 | Zionsville | Standard | 3,230 | $112,721 | 14.8 | -4.9% |
| 18053 | Germansville | Standard | 2,344 | $83,370 | 18.4 | -13.3% |
| 18059 | Laurys Station | Standard | 744 | $167,961 | 1.8 | -39.4% |
| 18087 | Trexlertown | Standard | 590 | $72,917 | 0.4 | 12.0% |
| 18065 | Neffs | PO Box | 577 | — | 0.0 | — |
| 18079 | Slatedale | PO Box | 303 | $96,071 | 0.2 | 24.7% |
| 18046 | East Texas | PO Box | 201 | — | 0.0 | 491.2% |
| 18195 | Allentown | Standard | 0 | — | 0.3 | — |
| 18068 | Old Zionsville | PO Box | — | — | 0.0 | — |
| 18099 | Emmaus | Unique | — | — | 0.0 | — |
| 18098 | Emmaus | Unique | — | — | 0.0 | — |
| 18060 | Limeport | PO Box | — | — | 0.0 | — |
| 18105 | Allentown | PO Box | — | — | 0.0 | — |