Trumbull County is a county in the far northeast portion of the U.S. state of Ohio. As of the 2020 census, the population was 201,977.^[2] Its county seat and largest city is Warren, which developed industry along the Mahoning River.^[3] Trumbull County is part of the Youngstown–Warren, OH Metropolitan Statistical Area.

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Trumbull County
County
Trumbull County Courthouse
Seal
Location within the U.S. state of Ohio
Ohio's location within the U.S.
Coordinates: 41°19′N 80°46′W
Country	United States
State	Ohio
Founded	July 10, 1800[1]
Named for	Jonathan Trumbull
Seat	Warren
Largest city	Warren
Area
• Total	637 sq mi (1,650 km2)
• Land	618 sq mi (1,600 km2)
• Water	18 sq mi (50 km2)  2.9%
Population  (2020)
• Total	201,977
• Estimate  (2021)	201,335
• Density	320/sq mi (120/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	14th
Website	www.co.trumbull.oh.us

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In the early years of the European discovery and exploration of the New World, the land that became Trumbull County was originally claimed by French explorers as part of the French colony of Canada (New France). Their settlements had some fur traders who interacted with Native American tribes in this area. After losing the Seven Years' War to Great Britain, France was forced to cede its territories east of the Mississippi River in 1763. Great Britain renamed New France as the Province of Quebec.

Following the United States' victory in its Revolutionary War, the British were forced to cede this land to the new nation. The federal government convinced Connecticut to give up its claim to the land, but it was known as part of the Connecticut Western Reserve in the Northwest Territory. Connecticut retained sovereignty over some of the eastern portion of what became Ohio, selling this area in 1795 to the Connecticut Land Company, a speculative private development firm. As first organized, Trumbull County consisted of the entire area of the Connecticut Western Reserve before population increased, and it was divided into smaller counties. The county's main city, Warren, was originally founded as the capitol of the Western Reserve territory.^[4]

No Native American settlements have ever formally been identified in Trumbull County, however artifacts are uncovered often. Early settlers did believe they noted an ancient village site in Kinsman, a more contemporary site in Hartford and several strange stone constructions were noted in the Black Ash Swamp by early Bristol residents- this area now known as the Grand River Preserve. Many presumably different groups of Natives were still frequenting camps in the vicinity of Newton Falls and somewhere near the Champion-Warren township border when modern Americans first began to settle there. Several of the names of specific Native persons are echoed across most of these early residents' histories- namely Cadashaway, Paqua and Kiogg. A memorial stone piles believed to have been Native in origin was situated on the West Bank of the Mahoning, but was later removed for construction purposes. ^[5] Before 1600, the area was ambiguously between the territories of the Erie people to the east and the Whittlesey Culture to the west. It is currently unknown precisely where one tribe's territory ended and the other began. After the Beaver Wars, the area was frequented by travelling Lenape, Wyandot, Ottawa, Shawnee and Seneca, who all had settlements nearby for a time and shared the valley's animal, food and medicinal resources. They also regularly panned for salt in the marshes. The Natives collectively used this area as a shared hunting ground, but had to give up ownership of the region for settlement as punishment for participating in the Northwest Indian War. ^[6] However, early residents say Natives still frequented the area until about the time of the War of 1812. Some of the final Native residents were camped along the Grand River in Mespotamia during the war, leading to an upsetting altercation in which the locals found and ransacked their camp and, as a warning to leave, carved an image of a Native man into a tree and shot it. The Natives responded by carving a white man into a tree without a mark on it, but seem to have later felt it was unsafe to stay and left.

The county is named for Jonathan Trumbull, Governor of Connecticut, who once owned the land in this region.^[7] Early settlements were made along the Mahoning River and other waterways, which provided transportation access and water power to the industries that developed later in the 19th century.

According to the United States Census Bureau, the county has a total area of 637 square miles (1,650 km²), of which 618 square miles (1,600 km²) is land and 18 square miles (47 km²) (2.9%) is water.^[8] It is approximately a square with sides of 25 miles; it is the only square county in Ohio.^[9]

Trumbull County was historically a Democratic stronghold; in 2016, however, Donald Trump won the county by a reasonably comfortable margin of 6.22%, being the first Republican to win the county since Richard Nixon in 1972.^[19] Trump expanded his margin in the county to 10.6 points in 2020.^[20]

• Kent State University Trumbull is a regional campus of Kent State University, offering several associate degrees and a few bachelor's degrees.^[22]
• Trumbull County Career and Technical Center is a vocational school, offering different learning and career advancement opportunities for both high school and adult learners.^[23]

• National Register of Historic Places listings in Trumbull County, Ohio