Northumberland County
Sunbury, Northumberland County, Pennsylvania
Marker Inscription
Formed March 21, 1772 from Lancaster, Cumberland, Berks, Bedford and Northampton counties. Some 27 counties today occupy its once vast area. Sunbury, the county seat, was laid out 1772. Site of Fort Augusta, a key post built 1756-57.
Erected by Pennsylvania Historical and Museum Commission
The Story
When Northumberland County was formed in 1772 from pieces of five older counties, it sprawled across a vast frontier that would later be divided into some twenty-seven counties. At its heart lay Sunbury, laid out that same year at the confluence of the Susquehanna's branches. The site was already strategic: Fort Augusta, built in 1756–57 during the French and Indian War, stood here as a key military post guarding the colonial frontier.
Why it matters
It captures the moment when the Pennsylvania backcountry, secured by wartime forts, opened to settlement and gave rise to the counties that fill the state's interior today.
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Related events
- · French and Indian War
Themes & tags
Nearby & related markers
Fort Augusta
Sunbury, PA · est. 1948
As war with France spread along the frontier, Colonels James Burd and John Clapham raised Fort Augusta in 1756-57 at the forks of the Susquehanna. It became the region's key stronghold, guarding the vital river junction and anchoring Pennsylvania's defenses against raids during the French and Indian War. A mansion later rose on the site in 1852, long after the fort's soldiering days had passed.
Sunbury
Sunbury, PA · est. 1947
Laid out in 1772 as the seat of newly formed Northumberland County, Sunbury rose on the site of Shamokin, a major Native town at the forks of the Susquehanna. Surveyors John Lukens and William Maclay platted the town where Fort Augusta had stood since 1756, guarding the frontier, and the community grew into a hub of travel, trade, and industry before its incorporation as a borough in 1797.
The Bloody Spring
Sunbury, PA · est. 1967
During the French and Indian War, the Susquehanna frontier was a dangerous borderland where British colonists, French forces, and Native nations contested the land. From the garrison at nearby Fort Augusta, soldiers ventured out at their peril; here, one man is said to have been killed, his blood coloring the spring that gave the place its grim name. The story preserves the fear and violence that hung over Pennsylvania's backcountry in those years.
Sunbury
Shamokin Dam, PA · est. 1948
Sunbury was laid out in 1772 as the seat of newly formed Northumberland County, planted on the site of Shamokin, an important Native American town at the forks of the Susquehanna. Sixteen years earlier, during the French and Indian War, colonial authorities had built Fort Augusta here to guard the frontier. The spot's command of the river made it a lasting hub of travel, trade, and industry.