Trumbull County is a county located in the state of Ohio, United States. According to the 2010 census, it has a population of 210,312, which is a decrease of 6.6% from 225,116 in 2000. It is part of the Youngstown-Warren-Boardman, OH-PA Metropolitan Area. Its county seat is Warren. The county is named for Jonathan Trumbull, Governor of Connecticut, who once owned the land in this region.^{[dead link]}

Originally Trumbull County consisted of the entire area of the Connecticut Western Reserve before being divided into smaller counties.

According to the 2010 census, the county has a total area of 636.57 square miles (1,648.7 km²), of which 618.30 square miles (1,601.4 km²) (or 97.13%) is land and 18.27 square miles (47.3 km²) (or 2.87%) is water. It is approximately a square with sides of 25 miles; it is the only square county in Ohio.

As of the census of 2000, there were 225,116 people, 89,020 households, and 61,690 families residing in the county. The population density was 365 people per square mile (141/km²). There were 95,117 housing units at an average density of 154 per square mile (60/km²). The racial makeup of the county was 90.21% White, 7.90% Black or African American, 0.15% Native American, 0.45% Asian, 0.02% Pacific Islander, 0.21% from other races, and 1.07% from two or more races. 0.80% of the population were Hispanic or Latino of any race. 94.6 % spoke English and 1.0% German as their first language.

Ohio (ⁱ/oʊˈhaɪ.oʊ/) is a state in the Midwestern United States. Ohio is the 34th most extensive, the 7th most populous, and the 10th most densely populated of the 50 United States. The state's capital and largest city is Columbus.

The name "Ohio" originated from Iroquois word ohi-yo’, meaning "great river". The state, originally partitioned from the Northwest Territory, was admitted to the Union as the 17th state (and the first under the Northwest Ordinance) on March 1, 1803. Although there are conflicting narratives regarding the origin of the nickname, Ohio is historically known as the "Buckeye State" (relating to the Ohio buckeye tree) and Ohioans are also known as "Buckeyes".

The government of Ohio is composed of the executive branch, led by the Governor; the legislative branch, which comprises the Ohio General Assembly; and the judicial branch, which is led by the Supreme Court. Currently, Ohio occupies 18 seats in the United States House of Representatives. Ohio is known for its status as both a swing state and a bellwether in national elections.

Eric Bennett is an Australian former rugby league footballer of the 1940s. Hailing from The Central West region of New South Wales, he played in the New South Wales Rugby Football League premiership for the Western Suburbs Magpies at centre and five-eighth. Bennett played over 100 games for the Magpies from 1941 to 1949, captaining the team to the 1948 season premiership. Australian Rugby League Hall of Famer Keith Holman has credited Bennett, who helped him sign with Wests, as being a great influence on his career.