| ZIP Codes: | 29 ZIP Codes (19 Standard, 9 PO Box, 1 Unique) [See All] |
| Area Codes: | 272 / 484 / 570 / 610 / 835 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:32 PM |
| Population: | 343,492 [See All] |
| FIPS: | 42095 |
| CBSA: | Allentown-Bethlehem-Easton, PA-NJ |
| Land Area: | 393 sq mi |
| Water Area: | 8 sq mi |
| Coordinates: | 40.7288, -75.3268 |
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343,492 residents live across 29 ZIPs covering 393 sq mi, served by 19 distinct USPS-recognized cities.
Population moved from 322,793 to 343,492 from 2014 to 2024 — a +6.4% change. 17 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 18020 (Bethlehem, $126,166 median) and poorest ZIP 18015 (Bethlehem, $60,800) are 6.3 miles apart — a 2.1× income gap across local geography.
Median home values vary 1.7× across this county — from $230,200 in 18042 (Easton) to $387,100 in 18064 (Nazareth).
Density varies 43× across the county — from 145 people/sq mi in 18343 (Mount Bethel) to 6,231 in 18018 (Bethlehem).
Educational attainment ranges from 17.7% bachelor's+ in 18038 (Danielsville) to 45.8% in 18045 (Easton) — the breadth of educational profiles across the area.
Within Pennsylvania, this is the #12 most populous of 67 counties and ranks #10 for median household income with the #8 fastest decade growth .
Hosts 1 single-entity Unique ZIP: 18003Business Reply Mail .
Weighted by population, the typical household earns about $89,392 across the county — reflecting what a typical resident sees, not a simple ZIP average.
35.0% of adults age 25+ hold a bachelor's degree or higher (84,738 of 242,408 reporting). The most-educated ZIPs cluster around Easton.
19 Standard delivery, 9 PO Box only, 1 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 18042 | Easton | Standard | 45,532 | $77,556 | 22.5 | 8.7% |
| 18017 | Bethlehem | Standard | 40,640 | $91,173 | 16.0 | 9.2% |
| 18015 | Bethlehem | Standard | 34,852 | $60,800 | 23.6 | 8.8% |
| 18018 | Bethlehem | Standard | 32,965 | $75,417 | 5.3 | -0.6% |
| 18045 | Easton | Standard | 30,429 | $114,528 | 20.1 | 16.8% |
| 18064 | Nazareth | Standard | 26,970 | $103,393 | 38.8 | 9.7% |
| 18020 | Bethlehem | Standard | 21,204 | $126,166 | 12.9 | 3.0% |
| 18067 | Northampton | Standard | 19,590 | $93,652 | 26.3 | 5.0% |
| 18013 | Bangor | Standard | 17,597 | $78,847 | 63.4 | -3.5% |
| 18040 | Easton | Standard | 17,256 | $107,016 | 17.7 | 6.1% |
| 18055 | Hellertown | Standard | 12,117 | $90,234 | 20.6 | -3.6% |
| 18014 | Bath | Standard | 12,097 | $82,027 | 34.0 | 4.4% |
| 18088 | Walnutport | Standard | 8,488 | $82,083 | 22.0 | 3.5% |
| 18072 | Pen Argyl | Standard | 6,938 | $80,716 | 14.7 | 5.7% |
| 18091 | Wind Gap | Standard | 6,547 | $80,464 | 15.6 | 14.6% |
| 18343 | Mount Bethel | Standard | 3,637 | $80,491 | 25.1 | -5.1% |
| 18038 | Danielsville | Standard | 3,549 | $117,121 | 13.4 | 41.6% |
| 18085 | Tatamy | PO Box | 1,175 | $112,813 | 0.3 | 18.1% |
| 18063 | Martins Creek | PO Box | 606 | $64,963 | 0.0 | 2.9% |
| 18351 | Portland | PO Box | 546 | $52,679 | 0.1 | 4.4% |
| 18083 | Stockertown | PO Box | 489 | $99,688 | 0.6 | 1.7% |
| 18086 | Treichlers | PO Box | 229 | $69,179 | 0.0 | -42.5% |
| 18035 | Cherryville | Standard | 39 | — | 0.4 | -67.5% |
| 18016 | Bethlehem | Standard | — | — | 0.0 | — |
| 18002 | Lehigh Valley | PO Box | — | — | 0.0 | — |
| 18003 | Lehigh Valley | Unique | — | — | 0.0 | — |
| 18001 | Lehigh Valley | PO Box | — | — | 0.0 | — |
| 18043 | Easton | PO Box | — | — | 0.0 | — |
| 18044 | Easton | PO Box | — | — | 0.0 | — |