Northumberland County may refer to:

• Northumberland County, New South Wales, Australia, a cadastral division
• Northumberland County, New Brunswick, Canada
• Northumberland County, Ontario, Canada
• Northumberland County, Pennsylvania, United States
• Northumberland County, Virginia, United States

• Northumberland, a county of England

Topics referred to by the same term

This disambiguation page lists articles about distinct geographical locations with the same name.
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