Trumbull County, Ohio

Trumbull County is a county in Ohio, United States, in the far northeast corner about 55 miles southeast of Cleveland. It had a population of 201,977 at the 2020 census, an estimated 198,972 by 2025, and covers 618 square miles (1,600 km2) of land centred near 41°19′N 80°46′W. It is the only square county in Ohio, roughly 25 miles on each side.

Warren is the county seat and largest city; its postal code is 44481. The county holds 5 cities, 6 villages and 12 census designated places across 24 townships, plus a one-resident sliver of Youngstown, and it runs on Eastern Time. Its FIPS code is 39155.

Towns & Villages in Trumbull County

Trumbull County has 23 named places on census record: 11 incorporated cities and villages and 12 census designated places (CDPs) — built-up communities the Census Bureau counts but which have no government of their own. The Township column shows the township each place sits in or grew out of; Ohio municipalities govern themselves separately from townships.

A few entries need untangling. Youngstown’s city limits cross the Mahoning County line into Trumbull, but the 2020 census counted exactly one Trumbull resident there. Hubbard the city and Hubbard the township are separate governments, as are Warren city and Warren Township — the township’s biggest community is actually Leavittsburg. Lordstown village replaced the former Lordstown Township outright, so it has no township. Masury and West Hill run up to the Pennsylvania line and function as western extensions of Sharon, Pennsylvania.

Townships

Trumbull County keeps 24 civil townships, laid out on the Connecticut Western Reserve’s five-mile survey grid. Figures are 2020 census county-subdivision counts; they exclude Warren, Cortland, Lordstown, McDonald and Orangeville, which the census tallies separately.

ZIP Codes

The county uses 27 ZIP codes: 23 standard delivery codes and 4 post-office-box codes.

• 44481, 44483, 44484, 44485 — Warren (southwest, north, east and west sides; 44481 also serves Lordstown, 44484 serves Howland; 44482 is a Warren PO box code)
• 44446 — Niles (also serves McKinley Heights)
• 44410 — Cortland (also serves the Mosquito Creek Lake area)
• 44420 — Girard (also serves Churchill)
• 44425 — Hubbard (also serves Maplewood Park)
• 44444 — Newton Falls (also serves Braceville)
• 44438 — Masury (also serves West Hill and Yankee Lake)
• 44430 — Leavittsburg
• 44440 — Mineral Ridge
• 44437 — McDonald
• 44403 — Brookfield (also serves Brookfield Center)
• 44473 — Vienna (also serves Vienna Center)
• 44470 — Southington
• 44491 — West Farmington
• 44428 — Kinsman; 44402 — Bristolville; 44450 — North Bloomfield; 44404 — Burghill; 44417 — Farmdale; 44418 — Fowler
• 44439 — Mesopotamia, 44424 — Hartford and 44453 — Orangeville (PO box codes only)

Champion Heights, Howland Center and Bolindale have no ZIP of their own; their mail is delivered under the adjoining Warren codes. Mesopotamia, Hartford and Orangeville keep post-office boxes only, with street delivery handled from neighbouring offices.

Geography

Trumbull County sits on the glaciated Allegheny Plateau, a landscape of low ridges, dairy flats and swampy headwaters. Total area is 637 square miles, of which 618 are land and 18 are water — 2.9 percent, the highest share in the Mahoning Valley, thanks mostly to Mosquito Creek Lake, one of Ohio’s largest inland reservoirs, which runs seven miles up the county’s middle between Cortland and Mecca. The Mahoning River enters from the west, bends south at Warren and drains the industrial corridor through Niles and Girard; the Grand River and Pymatuning Creek drain the rural north.

Ashtabula County lies to the north, Mercer County, Pennsylvania to the east across the state line, Mahoning County to the south, and Portage County and Geauga County to the west.

Demographics

The county counted 201,977 residents in 2020, down from its 1970 peak above 230,000, and the 2025 estimate stands near 198,972. Warren and Niles are the two largest communities, and the Warren–Niles–Girard corridor along the Mahoning River holds well over half the population. Median household income runs $56,435, well below Ohio’s statewide $71,389, a gap left by fifty years of steel and auto-plant closures. Density works out to about 327 people per square mile of land — suburban along the river corridor, thinly settled Amish farm country in townships like Mesopotamia and Bloomfield to the north.

Economy & Local Life

Manufacturing is still the county’s biggest employer at about 15,660 workers, ahead of health care and social assistance at 13,464 and retail trade at 10,512. Thomas Steel Strip and St. Joseph Warren Hospital anchor employment in Warren, where Kimberly-Clark announced a new production facility in 2024. Lordstown carries the county’s industrial story in one village: the GM assembly plant that ran there from 1966 to 2019 now belongs to Foxconn, and the Ultium Cells battery plant — a GM–LG joint venture — began production next door in August 2022. Kent State University’s Trumbull campus sits in Champion Township. The Trumbull County Fair, held each July in Bazetta Township near Cortland, is the county’s biggest annual gathering.

History

Trumbull County was created on 10 July 1800 as the first county of the Connecticut Western Reserve, and at birth it covered the entire Reserve — the ancestor of every county in northeast Ohio. It was named for Jonathan Trumbull, the Connecticut governor of the Revolutionary War years. Warren, founded in 1798, served as the Reserve’s first capital and kept the county seat when the giant county was carved down.

Brothers James Ward and William Doud Packard founded Packard Electric in Warren in 1890 and built the first Packard automobile there in 1899; Packard Electric’s wiring works stayed the city’s signature employer for a century, and Warren claims the first electric street lighting in an American town. Trumbull Steel, absorbed by Republic Steel in 1928, kept its Warren mill running under various owners until 2012 — its slow shutdown, with the GM Lordstown closure, defines the county’s modern economic arc.

Getting There

Interstate 80 crosses the county’s southern townships past Lordstown, linking Youngstown with the Ohio Turnpike. US 422 follows the Mahoning corridor through Warren and Niles, US 62 serves Hubbard, and State Route 11 runs the county’s length north–south as a freeway; SR 5, SR 45, SR 46 and SR 82 fill the grid.

• Youngstown — about 14 miles southeast of Warren
• Akron — about 45 miles west
• Cleveland — about 55 miles northwest
• Pittsburgh — about 65 miles southeast

Youngstown–Warren Regional Airport sits inside the county in Vienna Township but has no scheduled passenger service; Cleveland Hopkins International and Pittsburgh International, each roughly 70 miles out, are the practical choices. Amtrak’s nearest stations are in Cleveland and Pittsburgh.

Frequently Asked Questions

Where is Trumbull County located?
In Ohio’s far northeast corner, bordered by Ashtabula, Mahoning, Portage and Geauga counties and by Mercer County across the Pennsylvania line.

What is the population of Trumbull County?
201,977 at the 2020 census, with a 2025 estimate near 198,972.

How big is Trumbull County?
637 square miles — 618 of land and 18 of water — in an almost perfect square, the only one among Ohio’s 88 counties.

Which city is the seat of Trumbull County?
Warren, founded in 1798 as capital of the Connecticut Western Reserve, is the seat and largest city.

How many towns and cities are in Trumbull County?
Eleven incorporated places — the cities of Warren, Niles, Girard, Hubbard and Cortland, and the villages of Newton Falls, Lordstown, McDonald, West Farmington, Orangeville and Yankee Lake — plus 12 census designated places.

What ZIP codes does Trumbull County use?
27 codes, including 44481–44485 for Warren, 44446 for Niles, 44420 for Girard, 44425 for Hubbard, 44410 for Cortland and 44444 for Newton Falls.

What is Trumbull County known for?
The first Packard automobile, built in Warren in 1899; the GM Lordstown plant and its Ultium battery successor; Mosquito Creek Lake; and being Ohio’s only square county.

More counties in this state: Towns and villages in Ohio.