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Hamilton County, Ohio

Hamilton County: county in New York, United States

About

Hamilton County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 802,374 and a population density of 171 people per km². After 10 years in 2020 county had an estimated population of 817,985 inhabitants. Its county seat is Lake Pleasant (hamlet), New York. The county was created 179 years ago in 1846.

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

County Snapshot

Hamilton County at a glance

Hamilton County currently has 63 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.

Browse county places

Mapped populated places

63

These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.

Top linked places

Cincinnati 304,548 Delhi 29,764 Riverside 25,169 Norwood 19,696

Quick Facts about Hamilton County

Population 817,985 (2020)
Country United States of America
State Ohio (United States)
Different from Hamilton County, Hamilton County, Hamilton County, Hamilton County, Hamilton County, Hamilton County, Hamilton County, Hamilton County, Hamilton County
Area 4682 km2
Water as percent of area 5%
Land as percent of area 95%
Latitude & Longitude 39.1955,-84.5428
Named for Alexander Hamilton
Altitude 673 feet / 205 meters
Capital Lake Pleasant (hamlet), New York
Establishment January 01, 1847
Time Zone America/New_York
Local time 12:26:57 (17th April 2026)
Density 175 Pop. per km² as of 2020
Population growth 1.91% (2010-2020)
Weather 86℉ Mostly Sunny 7-days weather
Hamilton County Courthouse and Clerks Office NY Aug 10 image
Hamilton County Courthouse and Clerks Office NY Aug 10 image

Geography

Hamilton County is located at 39°11'44"N 84°32'34"W (39.1955300, -84.5427700). It has 7 neighbors: Warren County, Essex County, Franklin County, Fulton County, Herkimer County, St. Lawrence County and Saratoga County.

Hamilton County map

Click "full screen" full screen map icon to open full mode. View satellite images

The largest city of Hamilton County is Cincinnati with a population of 304,548. Other cities include, Riverside population 25,169, Norwood population 19,696, Forest Park population 18,534 and Blue Ash population 12,492. See all Hamilton County cities & populated places.

Hamilton County Populated Places (more)

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

City Name Population Title
Cincinnati 304,548 The third most populous city in Ohio and the center of the Cincinnati metropolitan area.
Delhi 29,764 Township in Hamilton County, Ohio
Riverside 25,169 City in Ohio
Norwood 19,696 City in Ohio
Forest Park 18,534 City in United States of America
Finneytown 12,741 Census-designated place in Hamilton County, Ohio
Blue Ash 12,492 City in Ohio
Sharonville 11,210 City in Hamilton County, Ohio, United States
Springdale 11,201 City in Ohio, USA
Montgomery 10,888 City in Hamilton County, Ohio, United States
Dent 10,497 Census-designated place in Hamilton County, Ohio
Reading 10,204 City in Ohio, United States
Madeira 9,284 City in Hamilton County, Ohio, United States
North College Hill 9,246 City in United States of America
Wyoming 8,550 City in Hamilton County, Ohio, United States
Cheviot 8,180 City in United States of America

Weather

86°F
Mostly Sunny
3 to 7 mph SW Friday

Mostly sunny, with a high near 86.

7-Day Forecast

Official website of Hamilton County

Official Website

Demographics

The population of Hamilton County increased by 1.91% in 10 years.

Year Population % Change Method
2010 802,374 - census
2011 800,658 -0.21% estimation process
2012 802,409 0.22% estimation process
2013 805,182 0.34% estimation process
2014 807,617 0.3% estimation process
2015 809,527 0.24% estimation process
2016 811,332 0.22% estimation process
2017 814,170 0.35% estimation process
2018 815,445 0.16% estimation process
2019 817,473 0.25% estimation process
2020 817,985 0.06% estimation process
Map of countries with a smaller population than Hamilton County
Comitatul Hamilton, Comte de Hamilton, Comté de Hamilton, Condado de Hamilton, Condado han Hamilton, Contea di Hamilton, Gamil'ton, Hamilton, Hamilton Comitatus, Hamilton Kun, Hamilton Kūn, Hamilton konderria, Hamilton megye, Hamiltoni maakond, Hamiltonin piirikunta, Hrabstwo Hamilton, Khamiltun, Okrug Khamilton, Quan Hamilton, Quận Hamilton, hamiruton jun, han mi er dun xian, hyamilatana ka'unti, mqatʿt hamltwn, shhrstan hmyltwn awhayw, Гамильтон, Гамільтон, Округ Хамилтон, Хамилтън, شهرستان همیلتون، اوهایو, مقاطعة هاملتون, ہیملٹن کاؤنٹی، اوہائیو, হ্যামিলটন কাউন্টি, ハミルトン郡, 漢密爾頓縣

People born in Hamilton County (1)

United States federal judge Hiram V. Willson was born in Hamilton County

Other places with the same name (9)

Ohio Other Counties (more counties)

County Name Population Title
Franklin County 1,324,624 County in Massachusetts, United States
Cuyahoga County 1,227,883 County in Ohio, United States
Columbus 884,356 The fifteenth most populous city in the United States and the center of the Columbus metropolitan area.
Summit County 538,866 County in northern Utah, United States
Montgomery County 531,610 County in Ohio, United States
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
Delaware County 213,554 County in Ohio, United States

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