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U.S. ZIP Codes Database 2026

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ZIP Code Details for Oak Harbor

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

Postal Information

ZIP Code 43449
Type Standard
Primary City Oak Harbor
State OH
County Ottawa County
Acceptable Cities -
Unacceptable -
Time Zone America/New_York
Area Codes 419, 567
Latitude 41,51° N
Longitude -83,14° 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 Harbor, OH

Postal Information

ZIP Code 98277
Type Standard
Primary City Oak Harbor
State WA
County Island County
Acceptable Cities -
Unacceptable Ault Field
Time Zone America/Los_Angeles
Area Codes 360, 564
Latitude 48,32° N
Longitude -122,63° 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 Harbor, WA

Postal Information

ZIP Code 98278
Type Unique
Primary City Oak Harbor
State WA
County Island County
Acceptable Cities Nas Whidbey, Whidbey Island Naval Air
Unacceptable Naval Air Station, Whidbey Nas
Time Zone America/Los_Angeles
Area Codes 360, 564
Latitude 48,34° N
Longitude -122,67° 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 Harbor, WA

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.