County ZIP codes · Pennsylvania · FIPS 42095
Northampton County, PA ZIP Codes
Northampton County, Pennsylvania has 32 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 26 residential and 6 for PO boxes or a single organization. 22 of the residential ones lie mainly in Northampton County and 4 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $58,031 in 18109 (Allentown) to $126,166 in 18020 (Bethlehem) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Northampton County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $78,847 and $103,393.
They carry 21 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 26 residential ZIP codes in Northampton County
22 ZIP codes lie mainly in Northampton County; 4 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 18042 | Easton | 45,532 | 2,059 | $78k | $230k | 99% |
| 18017 | Bethlehem | 40,640 | 2,425 | $91k | $336k | 95% |
| 18015 | Bethlehem | 34,852 | 1,503 | $61k | $282k | 65% |
| 18045 | Easton | 30,429 | 1,580 | $115k | $337k | 100% |
| 18064 | Nazareth | 26,970 | 701 | $103k | $387k | 100% |
| 18020 | Bethlehem | 21,204 | 1,629 | $126k | $370k | 100% |
| 18067 | Northampton | 19,590 | 768 | $94k | $282k | 100% |
| 18013 | Bangor | 17,597 | 279 | $79k | $260k | 100% |
| 18040 | Easton | 17,256 | 999 | $107k | $361k | 100% |
| 18055 | Hellertown | 12,117 | 606 | $90k | $324k | 94% |
| 18014 | Bath | 12,097 | 369 | $82k | $289k | 100% |
| 18088 | Walnutport | 8,488 | 446 | $82k | $253k | 100% |
| 18072 | Pen Argyl | 6,938 | 466 | $81k | $253k | 100% |
| 18091 | Wind Gap | 6,547 | 441 | $81k | $278k | 100% |
| 18343 | Mount Bethel | 3,637 | 179 | $81k | $326k | 100% |
| 18038 | Danielsville | 3,549 | 264 | $117k | $280k | 100% |
| 18085 | Tatamy | 1,175 | 3,150 | $113k | $282k | 100% |
| 18063 | Martins Creek | 606 | 1,426 | $65k | $240k | 100% |
| 18351 | Portland | 546 | 1,650 | $53k | $267k | 100% |
| 18083 | Stockertown | 489 | 709 | $100k | $306k | 100% |
| 18086 | Treichlers | 229 | 1,601 | $69k | $310k | 100% |
| 18035 | Cherryville | 39 | 185 | – | – | 100% |
Partly in Northampton County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 18032 | Catasauqua | 9,555 | 4,754 | $81k | $223k | 36% |
| 18018 | Bethlehem | 32,965 | 6,374 | $75k | $251k | 34% |
| 18077 | Riegelsville | 2,203 | 164 | $98k | $439k | 7% |
| 18109 | Allentown | 18,446 | 2,236 | $58k | $199k | 5% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
8 ZIP codes of Northampton County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Northampton | Elsewhere |
|---|---|---|
| 18042 | 99% | |
| 18017 | 95% | Lehigh County 5% |
| 18015 | 65% | Lehigh County 35% |
| 18018 | 34% | Lehigh County 66% |
| 18109 | 5% | Lehigh County 95% |
| 18055 | 94% | Bucks County 6% |
| 18032 | 36% | Lehigh County 64% |
| 18077 | 7% | Bucks County 93% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Northampton County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Northampton County's ZIP codes use 3 prefixes: 180, 181 and 183.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 180 | Lehigh Valley, PA (SCF 180) | 29 | 68 |
| 181 | Lehigh Valley, PA (SCF 180) | 1 | 8 |
| 183 | Lehigh Valley, PA (SCF 180) | 2 | 40 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.