U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

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ZIP Code Details for Williams

Detailed geographic and postal record lookup for the city of Williams.

Postal Information

ZIP Code 17270
Type Po Box
Primary City Williamson
State PA
County Franklin County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 717
Latitude 39,85° N
Longitude -77,8° W

About U.S. ZIP Codes

U.S. ZIP Codes are 5-digit postal codes introduced in 1963 by the USPS to improve mail sorting efficiency. The first digit represents a broad region, the next two identify a sectional center facility, and the final two help pinpoint a local post office or delivery area.

Geographic Breakdown:

  • 1st Digit: Represents a group of states or a broad national region.
  • 2nd/3rd Digits: Represent a regional area or large city.
  • 4th/5th Digits: Identify specific post offices or delivery zones.

ZIP Codes support physical delivery, routing analytics, geocoding, tax calculations, and location-based research.

Geographic Map of Williamson, PA

Postal Information

ZIP Code 17701
Type Standard
Primary City Williamsport
State PA
County Lycoming County
Acceptable Cities -
Unacceptable Barbours, Center City, Faxon, Grampian Hls, Grimesville, Heshbon Park, Loyalsock, Newberry, Old Lycoming, Plunketts Crk, Proctor, Towncrest Vlg, Vallamont Hls, Warrensville
Time Zone America/New_York
Area Codes 272, 570
Latitude 41,23° N
Longitude -77,03° W

About U.S. ZIP Codes

U.S. ZIP Codes are 5-digit postal codes introduced in 1963 by the USPS to improve mail sorting efficiency. The first digit represents a broad region, the next two identify a sectional center facility, and the final two help pinpoint a local post office or delivery area.

Geographic Breakdown:

  • 1st Digit: Represents a group of states or a broad national region.
  • 2nd/3rd Digits: Represent a regional area or large city.
  • 4th/5th Digits: Identify specific post offices or delivery zones.

ZIP Codes support physical delivery, routing analytics, geocoding, tax calculations, and location-based research.

Geographic Map of Williamsport, PA

Postal Information

ZIP Code 17702
Type Standard
Primary City Williamsport
State PA
County Lycoming County
Acceptable Cities Armstrong, Bastress, Collomsville, Duboistown, Nisbet, S Williamspor, S Williamsport, S Williamsprt, South Williamsport, Sylvan Dell
Unacceptable Oval
Time Zone America/New_York
Area Codes 272, 570
Latitude 41,18° N
Longitude -77,08° W

About U.S. ZIP Codes

U.S. ZIP Codes are 5-digit postal codes introduced in 1963 by the USPS to improve mail sorting efficiency. The first digit represents a broad region, the next two identify a sectional center facility, and the final two help pinpoint a local post office or delivery area.

Geographic Breakdown:

  • 1st Digit: Represents a group of states or a broad national region.
  • 2nd/3rd Digits: Represent a regional area or large city.
  • 4th/5th Digits: Identify specific post offices or delivery zones.

ZIP Codes support physical delivery, routing analytics, geocoding, tax calculations, and location-based research.

Geographic Map of Williamsport, PA

Postal Information

ZIP Code 17703
Type Po Box
Primary City Williamsport
State PA
County Lycoming County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 570
Latitude 41,23° N
Longitude -77,03° W

About U.S. ZIP Codes

U.S. ZIP Codes are 5-digit postal codes introduced in 1963 by the USPS to improve mail sorting efficiency. The first digit represents a broad region, the next two identify a sectional center facility, and the final two help pinpoint a local post office or delivery area.

Geographic Breakdown:

  • 1st Digit: Represents a group of states or a broad national region.
  • 2nd/3rd Digits: Represent a regional area or large city.
  • 4th/5th Digits: Identify specific post offices or delivery zones.

ZIP Codes support physical delivery, routing analytics, geocoding, tax calculations, and location-based research.

Geographic Map of Williamsport, PA

Postal Information

ZIP Code 17705
Type Unique
Primary City Williamsport
State PA
County Lycoming County
Acceptable Cities -
Unacceptable Bro Dart
Time Zone America/New_York
Area Codes 570
Latitude 41,23° N
Longitude -77,03° W

About U.S. ZIP Codes

U.S. ZIP Codes are 5-digit postal codes introduced in 1963 by the USPS to improve mail sorting efficiency. The first digit represents a broad region, the next two identify a sectional center facility, and the final two help pinpoint a local post office or delivery area.

Geographic Breakdown:

  • 1st Digit: Represents a group of states or a broad national region.
  • 2nd/3rd Digits: Represent a regional area or large city.
  • 4th/5th Digits: Identify specific post offices or delivery zones.

ZIP Codes support physical delivery, routing analytics, geocoding, tax calculations, and location-based research.

Geographic Map of Williamsport, PA

Postal Information

ZIP Code 21795
Type Standard
Primary City Williamsport
State MD
County Washington County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 227, 240, 301, 304, 681
Latitude 39,59° N
Longitude -77,81° W

About U.S. ZIP Codes

U.S. ZIP Codes are 5-digit postal codes introduced in 1963 by the USPS to improve mail sorting efficiency. The first digit represents a broad region, the next two identify a sectional center facility, and the final two help pinpoint a local post office or delivery area.

Geographic Breakdown:

  • 1st Digit: Represents a group of states or a broad national region.
  • 2nd/3rd Digits: Represent a regional area or large city.
  • 4th/5th Digits: Identify specific post offices or delivery zones.

ZIP Codes support physical delivery, routing analytics, geocoding, tax calculations, and location-based research.

Geographic Map of Williamsport, MD

Postal Information

ZIP Code 23185
Type Standard
Primary City Williamsburg
State VA
County James City County
Acceptable Cities -
Unacceptable Wlmg, Wmsbg
Time Zone America/New_York
Area Codes 757, 804, 948
Latitude 37,27° N
Longitude -76,7° W

About U.S. ZIP Codes

U.S. ZIP Codes are 5-digit postal codes introduced in 1963 by the USPS to improve mail sorting efficiency. The first digit represents a broad region, the next two identify a sectional center facility, and the final two help pinpoint a local post office or delivery area.

Geographic Breakdown:

  • 1st Digit: Represents a group of states or a broad national region.
  • 2nd/3rd Digits: Represent a regional area or large city.
  • 4th/5th Digits: Identify specific post offices or delivery zones.

ZIP Codes support physical delivery, routing analytics, geocoding, tax calculations, and location-based research.

Geographic Map of Williamsburg, VA

Postal Information

ZIP Code 23186
Type Unique
Primary City Williamsburg
State VA
County Williamsburg City
Acceptable Cities -
Unacceptable College Of William & Mary, Wlmg
Time Zone America/New_York
Area Codes 757
Latitude 37,27° N
Longitude -76,7° W

About U.S. ZIP Codes

U.S. ZIP Codes are 5-digit postal codes introduced in 1963 by the USPS to improve mail sorting efficiency. The first digit represents a broad region, the next two identify a sectional center facility, and the final two help pinpoint a local post office or delivery area.

Geographic Breakdown:

  • 1st Digit: Represents a group of states or a broad national region.
  • 2nd/3rd Digits: Represent a regional area or large city.
  • 4th/5th Digits: Identify specific post offices or delivery zones.

ZIP Codes support physical delivery, routing analytics, geocoding, tax calculations, and location-based research.

Geographic Map of Williamsburg, VA

Postal Information

ZIP Code 23187
Type Po Box
Primary City Williamsburg
State VA
County Williamsburg city
Acceptable Cities -
Unacceptable Wlmg
Time Zone America/New_York
Area Codes 757
Latitude 37,27° N
Longitude -76,72° W

About U.S. ZIP Codes

U.S. ZIP Codes are 5-digit postal codes introduced in 1963 by the USPS to improve mail sorting efficiency. The first digit represents a broad region, the next two identify a sectional center facility, and the final two help pinpoint a local post office or delivery area.

Geographic Breakdown:

  • 1st Digit: Represents a group of states or a broad national region.
  • 2nd/3rd Digits: Represent a regional area or large city.
  • 4th/5th Digits: Identify specific post offices or delivery zones.

ZIP Codes support physical delivery, routing analytics, geocoding, tax calculations, and location-based research.

Geographic Map of Williamsburg, VA

Postal Information

ZIP Code 23188
Type Standard
Primary City Williamsburg
State VA
County James City County
Acceptable Cities -
Unacceptable Wlmg
Time Zone America/New_York
Area Codes 757, 804, 948
Latitude 37,35° N
Longitude -76,77° W

About U.S. ZIP Codes

U.S. ZIP Codes are 5-digit postal codes introduced in 1963 by the USPS to improve mail sorting efficiency. The first digit represents a broad region, the next two identify a sectional center facility, and the final two help pinpoint a local post office or delivery area.

Geographic Breakdown:

  • 1st Digit: Represents a group of states or a broad national region.
  • 2nd/3rd Digits: Represent a regional area or large city.
  • 4th/5th Digits: Identify specific post offices or delivery zones.

ZIP Codes support physical delivery, routing analytics, geocoding, tax calculations, and location-based research.

Geographic Map of Williamsburg, VA

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Postal context

About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.