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 |
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Sample Address Format for Northumberland
[Sender Street Address]
[City, ZIP]
[Country]
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
| Country | Canada (CA) |
|---|---|
| Administrative Path | Canada β Ontario |
| Postal Code | K0K~L1A |
| Province | Ontario |
| ISO Codes | CA / CAN / 124 |
| Top-level domain (ccTLD) | .ca |
| Coordinates | 44.10966, -77.987293 |
| Places | 18 |
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
Other Districts
- Algoma
- Brant
- Bruce
- Chatham-Kent
- Cochrane
- Dufferin
- Durham
- Elgin
- Essex
- Frontenac
- Greater Sudbury
- Grey
- Haldimand-Norfolk
- Haliburton
- Halton
- Hamilton
- Hastings
- Huron
- Kawartha Lakes
- Kenora
- Lambton
- Lanark
- Leeds and Grenville
- Lennox and Addington
- Manitoulin
- Middlesex
- Muskoka
- Niagara
- Nipissing
- Ottawa
- Oxford
- Parry Sound
- Peel
- Perth
- Peterborough
- Prescott and Russell
- Prince Edward
- Rainy River
- Renfrew
- Simcoe
- Stormont, Dundas and Glengarry
- Sudbury
- Thunder Bay
- Timiskaming
- Toronto
- Waterloo
- Wellington
- York