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U.S. ZIP Codes Database 2026

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ZIP Code Details for Oak

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

Postal Information

ZIP Code 16245
Type Po Box
Primary City Oak Ridge
State PA
County Armstrong County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 582, 814
Latitude 41,01° N
Longitude -79,3° 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 Oak Ridge, PA

Postal Information

ZIP Code 17076
Type Standard
Primary City Oakland Mills
State PA
County Juniata County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 223, 717
Latitude 40,62° N
Longitude -77,31° 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 Oakland Mills, PA

Postal Information

ZIP Code 19456
Type Po Box
Primary City Oaks
State PA
County Montgomery County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 484, 610, 835
Latitude 40,14° N
Longitude -75,46° 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 Oaks, PA

Postal Information

ZIP Code 21207
Type Standard
Primary City Gwynn Oak
State MD
County Baltimore County
Acceptable Cities Baltimore, Pikesville, Woodlawn
Unacceptable -
Time Zone America/New_York
Area Codes 410, 443, 667
Latitude 39,32° 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 Gwynn Oak, MD

Postal Information

ZIP Code 21550
Type Standard
Primary City Oakland
State MD
County Garrett County
Acceptable Cities Crellin, Deer Park, Hutton, Loch Lyn Hght, Loch Lynn Heights, Mnt Lake Park, Mountain Lake Park, Mt Lake Park, Mtn Lk Park
Unacceptable -
Time Zone America/New_York
Area Codes 227, 240, 301, 304, 681
Latitude 39,41° N
Longitude -79,41° 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 Oakland, MD

Postal Information

ZIP Code 21662
Type Standard
Primary City Royal Oak
State MD
County Talbot County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 410, 443, 667
Latitude 38,71° N
Longitude -76,21° 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 Royal Oak, MD

Postal Information

ZIP Code 22124
Type Standard
Primary City Oakton
State VA
County Fairfax County
Acceptable Cities Vienna
Unacceptable -
Time Zone America/New_York
Area Codes 571, 703
Latitude 38,89° N
Longitude -77,33° 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 Oakton, VA

Postal Information

ZIP Code 22730
Type Standard
Primary City Oakpark
State VA
County Madison County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 540, 826
Latitude 38,36° N
Longitude -78,16° 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 Oakpark, VA

Postal Information

ZIP Code 23396
Type Standard
Primary City Oak Hall
State VA
County Accomack County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 757
Latitude 37,93° N
Longitude -75,54° 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 Oak Hall, VA

Postal Information

ZIP Code 23416
Type Standard
Primary City Oak Hall
State VA
County Accomack County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 757, 948
Latitude 37,93° N
Longitude -75,54° 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 Oak Hall, 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.