Seneca County, Ohio

Seneca County: County in New York, United States

About

Seneca County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 56,745 and a population density of 67 people per km². After 10 years in 2020 county had an estimated population of 54,938 inhabitants. Its county seat is Waterloo (village), New York. The county was created 221 years ago in 1803.

Seneca County locator map
Location of Seneca County on Ohio map.

Quick Facts about Seneca County

Population : 54,938 (2020)
Country : United States of America
State : Ohio (United States)
Different from : Seneca County
Area : 842 km2
Water as percent of area : 17%
Land as percent of area : 83%
Named for : Seneca people
Altitude : 791 feet / 241 meters
Capital : Waterloo (village), New York
Establishment : January 01, 1804
Time Zone : America/New_York
Local time : 18:24:30 (22nd February 2025)
Density : 65 Pop. per km² as of 2020
Population growth : -3.29% (2010-2020)
The Seneca County Courthouse Complex at Ovid 'August 2017' image
The Seneca County Courthouse Complex at Ovid 'August 2017'
The Seneca County Courthouse Complex at Ovid 'August 2017' image
The Seneca County Courthouse Complex at Ovid 'August 2017' image

Geography

Seneca County is located at 41°7'26"N 83°7'40"W (41.1238800, -83.1277100). It has 6 neighbors: Cayuga County, Ontario County, Schuyler County, Tompkins County, Wayne County and Yates County.

Seneca County map

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The largest city of Seneca County is Tiffin with a population of 17,359. Other cities include, Scipio population 1,282, Fostoria population 1,099, Bloomville population 906 and Attica population 862. See all Seneca County cities & populated places.

Seneca County Populated Places

Cities, towns, neighborhoods & other populated places in Seneca County.

City Name Population Title
Tiffin 17,359 City in and the county seat of Seneca County, Ohio, United States
Scipio 1,282 Human settlement in Ohio, United States of America
Fostoria 1,099 City in Ohio
Bloomville 906 Human settlement in Seneca County, Ohio, United States of America
Attica 862 Human settlement in Seneca County, Ohio, United States of America
Bettsville 618 Human settlement in Seneca County, Ohio, United States of America
Republic 518 Village in Seneca County, Ohio, United States
New Riegel 234 Human settlement in Seneca County, Ohio, United States of America

Seneca County has 6 neighbours.

Demographics

According to census records, the population of Seneca County decreased by 3.29% in 10 years.

Year Population % Change Method
2010 56,745 - census
2011 56,522 -0.39% estimation process
2012 56,106 -0.74% estimation process
2013 55,847 -0.46% estimation process
2014 55,803 -0.08% estimation process
2015 55,650 -0.27% estimation process
2016 55,467 -0.33% estimation process
2017 55,267 -0.36% estimation process
2018 55,194 -0.13% estimation process
2019 55,178 -0.03% estimation process
2020 54,938 -0.44% estimation process

Comitatul Seneca, Comte de Seneca, Comté de Seneca, Condado de Seneca, Condado han Seneca, Contea di Seneca, Hrabstwo Seneca, Okrug Seneka, Quan Seneca, Quận Seneca, Seneca, Seneca Comitatus, Seneca Kun, Seneca Kūn, Seneca konderria, Seneca maakond, Seneca megye, Senecan piirikunta, Seneka, mqatʿt snyka, se nei sa xian, seneka jun, seneka ka'unti, shhrstan snka awhayw, Округ Сенека, Сенека, سنیکا کاؤنٹی، اوہائیو, سینیکا کاؤنٹی، اوہائیو, شهرستان سنکا، اوهایو, مقاطعة سنيكا, সেনেকা কাউন্টি, セネカ郡, 瑟內薩縣

People born in Seneca County (2)

People born in Seneca County, including architect Louise Blanchard Bethune, Union Army General Elisha Marshall, .

List

Other places with the same name (2)

Ohio Other Counties (more counties)

County Name Population Title
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Hamilton County 817,985 County in New York, United States
Summit County 538,866 County in northern Utah, United States
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Lucas County 428,294 County in Ohio, United States
Butler County 385,648 County in Ohio, United States of America
Cleveland 378,589 The second most populous city in Ohio and the center of the Cleveland metropolitan area.
Stark County 369,772 County in Ohio, United States
Lorain County 312,172 County in Ohio, United States
Cincinnati 304,548 The third most populous city in Ohio and the center of the Cincinnati metropolitan area.
Toledo 271,455 The fourth most populous city in Ohio and the center of the Toledo metropolitan area.
Warren County 238,412 County in New York, United States
Lake County 229,569 County in Ohio, United States
Mahoning County 226,075 County in Ohio, United States