Northumberland County, Ontario

Northumberland County
County (upper-tier)
County of Northumberland
Clockwise from top: Downtown Campbellford from the Trent River, farmland in the Municipality of Trent Hills, downtown Port Hope from the Ganaraska River, downtown Colborne.
Cobourg Port Hope Hamilton Brighton Alnwick/Haldimand Trent Hills Cramahe
Location of Northumberland County within Ontario
Coordinates: 44°07′N 78°02′W / 44.117°N 78.033°W / 44.117; -78.033
Country	Canada
Province	Ontario
County seat	Cobourg
Municipalities	List Municipality of Brighton Town of Cobourg Municipality of Port Hope Municipality of Trent Hills Township of Alnwick/Haldimand Township of Cramahe Township of Hamilton
Government
• Type	Upper-tier municipal government
• Warden	Mandy Martin[1]
• Governing body	Northumberland County Council
Area [2]
• Total	1,905.15 km2 (735.58 sq mi)
Population  (2021)[2]
• Total	89,365
• Density	47.78/km2 (123.7/sq mi)
Time zone	UTC−05:00 (EST)
• Summer (DST)	UTC−05:00 (EDT)
Website	www.northumberlandcounty.ca

Northumberland County is an upper-tier municipality situated on the north shore of Lake Ontario, east of Toronto in Central Ontario. The Northumberland County headquarters are located in Cobourg.