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Northumberland Postal Codes: K0K to L1A | Ontario

Postal Codes for Northumberland range from K0K to L1A in Ontario, Canada. To find exact Postal Codes and postcodes within Northumberland, choose from the districts below.

Postal Codes for Places in Northumberland

Showing 18 places in Northumberland. Last verified with official records on May 2, 2026.

Baltimore
Bewdley
Brighton
Campbellcroft
Campbellford
Castleton
Cobourg
Codrington
Colborne
Gores Landing
Grafton
Hamilton Township
Harwood
Hastings
Port Hope
Roseneath
Trent River
Warkworth

Sample Address Format for Northumberland

Sender
[Sender Name]
[Sender Street Address]
[City, ZIP]
[Country]
Recipient
[Recipient Name]
Street Address / PO Box
Northumberland, Ontario, K0K
CANADA

Northumberland on the Map

The map above highlights the geographic boundaries of the Northumberland districts in Canada.

Northumberland Quick Facts

CountryCanada (CA)
Administrative PathCanada β†’ Ontario
Postal CodeK0K~L1A
ProvinceOntario
ISO CodesCA / CAN / 124
Top-level domain (ccTLD).ca
Coordinates44.10966, -77.987293
Places18

What to Know About Northumberland

Key Facts

Northumberland is a county located in the central-eastern part of Ontario, Canada, situated along the northern shore of Lake Ontario. This administrative region occupies a strategic position between the Greater Toronto Area to the west and the historic regions of Eastern Ontario. Covering approximately 1,905 square kilometers, Northumberland County serves as an important transitional zone between urban and rural landscapes in southern Ontario. With a population of around 89,000 residents, the county maintains a balanced mix of agricultural lands, small urban centers, and picturesque waterfront communities. The county is divided into seven lower-tier municipalities, including the towns of Cobourg and Port Hope, which serve as the primary urban centers, along with several townships that preserve the region's agricultural heritage and natural landscapes. This administrative structure allows for coordinated regional planning while maintaining local governance across its diverse communities. For those seeking postal code information or detailed location data, Northumberland County's municipal divisions provide accessible regional organization for navigation and service delivery throughout its territory.

Neighboring Regions

  • Peterborough County
  • Kawartha Lakes
  • Durham Region
  • Hastings County
  • Prince Edward County

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