Your Guide to Trumbull County, Ohio
Looking for trusted businesses, services and local resources in Trumbull County, Ohio? FindItOhio.com helps residents and visitors discover local companies, professionals and community information across Trumbull County, including Warren, the county seat.
Quick answer: Trumbull County is one of Ohio’s 88 counties. Its county seat is Warren, it was established in 1800, and it has an estimated 198,972 residents as of 2025.
At a Glance
- County seat: Warren
- Established: Jul 10, 1800
- Formed from: Jefferson and Wayne Counties
- Named for: Jonathan Trumbull (1710 to 1785), Governor of Connecticut when the county was organized
- Estimated population (2025): 198,972
- Total area: 616.48 sq mi
- FIPS code: 39155
About Trumbull County
Trumbull County is located in the far northeast portion of the U.S. state of Ohio. As of the 2020 census, the population was 201,977. Its county seat and largest city is Warren, which developed industry along the Mahoning River. Trumbull County is part of the Youngstown, Warren, OH Metropolitan Statistical Area.
History of Trumbull County
No Native American settlements have ever formally been identified in Trumbull County. Early settlers did believe they noted an ancient village site in Kinsman Township, a more contemporary site in Hartford Township, and several strange stone constructions were noted in the Black Ash Swamp by early Bristol residents, now known as the Grand River Preserve. Many presumably different groups of Native Americans were still frequenting camps in the vicinity of Newton Falls and near the Champion Township, Warren Township border when U.S. settlers 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 River, but was later removed for construction purposes.
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 unknown precisely where one tribe’s territory ended and the other began. After the Beaver Wars, the area was frequented by traveling 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.
Cities and Villages in Trumbull County
Cities
Cortland, Girard, Hubbard, Niles, Warren †, Youngstown â€
Villages
Lordstown, McDonald, Newton Falls, Orangeville, West Farmington, Yankee Lake
Find Local Businesses in Trumbull County
Browse the FindItOhio.com business directory to find restaurants, contractors, professional services, shops and more serving Trumbull County. Own a business here? Add your free business listing so local customers can find you.
Background Checks, Process Serving and Private Investigations
Residents and employers in Trumbull County can get BCI and FBI LiveScan fingerprinting, FD-258 fingerprint cards, process serving and licensed private investigations from these Ohio providers:
- Ohio Security & Investigations, Youngstown: licensed private investigations and fingerprinting. Call (888) 341-6960 or visit ohioinvestigators.com.
- 10-8 Protective Services, Columbus: investigations, fingerprinting and process serving. Call (800) 949-8521 or visit 10-8protectiveservices.com.
Frequently Asked Questions
What is the county seat of Trumbull County, Ohio?
Warren is the county seat of Trumbull County, Ohio.
When was Trumbull County established?
Trumbull County was established on Jul 10, 1800. It was formed from Jefferson and Wayne Counties.
Who or what is Trumbull County named for?
Trumbull County is named for Jonathan Trumbull (1710 to 1785), Governor of Connecticut when the county was organized.
How many people live in Trumbull County, Ohio?
Trumbull County has an estimated population of 198,972 as of 2025.
What cities are in Trumbull County, Ohio?
Cities in Trumbull County include Cortland, Girard, Hubbard, Niles, Warren †, Youngstown †.
Where can I find local businesses in Trumbull County?
Search the FindItOhio.com business directory to find local businesses and services in Trumbull County, Ohio.
How do I list my Trumbull County business on FindItOhio.com?
Visit the free business listing page on FindItOhio.com and submit your business name, address, phone number and website.
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County background adapted from the Wikipedia article Trumbull County, Ohio, available under the Creative Commons Attribution ShareAlike 4.0 license.