First three digits · Pennsylvania
ZIP Codes Starting with
44 ZIP codes start with 177, sorted at the Harrisburg, PA (SCF 170) sectional center (USPS labeling list L005, effective October 1, 2026) in Pennsylvania: 40 residential ZIP codes across 8 counties and 4 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 177 mean?
The first digit, 1, is one of ten national areas (Delaware, New York and Pennsylvania). The first three, 177, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 177 to the Harrisburg, PA (SCF 170) facility. The last two digits pick the delivery area. By residents, the largest town names among the 177 ZIP codes are Williamsport, Lock Haven, Muncy, Montoursville, Jersey Shore and Mill Hall.
The same facility sorts 14 prefixes, 576 ZIP codes in all: 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 195, 196, 254.
Where are the 177 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 177
| County | ||||||
|---|---|---|---|---|---|---|
| 17701 | Williamsport | Lycoming County | 43,104 | 440 | $53k | $184k |
| 17702 | Williamsport | Lycoming County | 10,488 | 171 | $70k | $197k |
| 17703 | Williamsport | Lycoming County | PO Box or unique | – | – | – |
| 17705 | Williamsport | Lycoming County | PO Box or unique | – | – | – |
| 17720 | Antes Fort | Lycoming County | 250 | 74 | $70k | $177k |
| 17721 | Avis | Clinton County | 1,419 | 1,198 | $59k | $141k |
| 17723 | Cammal | Lycoming County | 34 | 2 | $78k | $183k |
| 17724 | Canton | Bradford County | 4,693 | 43 | $56k | $175k |
| 17726 | Castanea | Clinton County | PO Box or unique | – | – | – |
| 17727 | Cedar Run | Tioga County | 41 | 1 | $50k | – |
| 17728 | Cogan Station | Lycoming County | 4,675 | 103 | $77k | $236k |
| 17729 | Cross Fork | Potter County | 156 | 1 | $48k | $85k |
| 17730 | Dewart | Northumberland County | 11 | 57 | – | – |
| 17731 | Eagles Mere | Sullivan County | 188 | 15 | $99k | $314k |
| 17735 | Grover | Bradford County | PO Box or unique | – | – | – |
| 17737 | Hughesville | Lycoming County | 5,970 | 99 | $70k | $204k |
| 17739 | Jersey Mills | Lycoming County | 27 | 2 | $55k | $275k |
| 17740 | Jersey Shore | Lycoming County | 12,017 | 88 | $70k | $180k |
| 17742 | Lairdsville | Lycoming County | 21 | 30 | $71k | $160k |
| 17744 | Linden | Lycoming County | 2,808 | 125 | $73k | $196k |
| 17745 | Lock Haven | Clinton County | 17,718 | 77 | $59k | $177k |
| 17747 | Loganton | Clinton County | 3,421 | 40 | $72k | $208k |
| 17748 | McElhattan | Clinton County | 184 | 188 | $70k | $94k |
| 17749 | McEwensville | Northumberland County | 234 | 701 | $75k | $197k |
| 17750 | Mackeyville | Clinton County | 177 | 128 | $148k | $148k |
| 17751 | Mill Hall | Clinton County | 7,431 | 53 | $75k | $215k |
| 17752 | Montgomery | Lycoming County | 4,975 | 122 | $71k | $187k |
| 17754 | Montoursville | Lycoming County | 12,061 | 201 | $73k | $249k |
| 17756 | Muncy | Lycoming County | 12,856 | 119 | $77k | $223k |
| 17758 | Muncy Valley | Sullivan County | 943 | 10 | $59k | $199k |
| 17760 | North Bend | Clinton County | 572 | 7 | $67k | $131k |
| 17762 | Picture Rocks | Lycoming County | 557 | 1,002 | $96k | $185k |
| 17763 | Ralston | Lycoming County | 241 | 14 | $57k | $114k |
| 17764 | Renovo | Clinton County | 2,361 | 14 | $41k | $84k |
| 17765 | Roaring Branch | Tioga County | 1,279 | 14 | $89k | $201k |
| 17768 | Shunk | Sullivan County | 367 | 12 | $55k | $146k |
| 17769 | Slate Run | Lycoming County | 31 | 1 | $130k | – |
| 17771 | Trout Run | Lycoming County | 2,929 | 13 | $71k | $198k |
| 17772 | Turbotville | Montour County | 2,693 | 116 | $81k | $242k |
| 17774 | Unityville | Lycoming County | 962 | 34 | $71k | $236k |
| 17776 | Waterville | Lycoming County | 145 | 2 | $68k | $165k |
| 17777 | Watsontown | Northumberland County | 7,030 | 191 | $67k | $217k |
| 17778 | Westport | Clinton County | 74 | 1 | $56k | $157k |
| 17779 | Woolrich | Clinton County | 179 | 132 | $54k | $164k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.