• county
  • FIPS 39113
  • Largest town: Dayton

Montgomery County, Ohio

Montgomery County had 537,443 residents in the Census Vintage 2024 estimate, on 461.4 square miles of land. It ranks 5th of 88 in Ohio by population and 37th by land area.

Population
537,443
#5 of 88 in Ohio · #136 in US
Area
461.4 sq mi
#37 of 88 in Ohio · #2,224 in US
Density
1,165 / sq mi
#6 of 88 in Ohio · #137 in US
Median household income
$62,650
#51 of 88 in Ohio · #1,589 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Montgomery County within Ohio. Pin: Columbus.

Measure from here

Tools and pages that start from Montgomery County

Montgomery County population, land area and income

Montgomery County had 537,443 residents in the Census Vintage 2024 estimate, on 461.4 square miles of land. It ranks 5th of 88 in Ohio by population and 37th by land area. That works out to 1,164.9 people per square mile, 12.1 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Ohio has 58,250 residents, so Montgomery County is 9.2 times that size.

Its SAIPE 2023 median household income of $62,650 is below the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

537,443

3144th1st

136th of 3,144 (US)

Land area

461 sq mi

3144th1st

2224th of 3,144 (US)

Density

1,164.9 / sq mi

3144th1st

137th of 3,144 (US)

Median household income

$62,650

3143rd1st

1589th of 3,143 (US)

Rank within Ohio (88)

Population

537,443

88th1st

5th of 88 (OH)

Land area

461 sq mi

88th1st

37th of 88 (OH)

Density

1,164.9 / sq mi

88th1st

6th of 88 (OH)

Median household income

$62,650

88th1st

51st of 88 (OH)

How Montgomery County's population changed since 2020

Montgomery County gained 304 residents between the July 2020 and July 2024 estimates, a rise of 0.1%. That ranks 34th of 88 in Ohio for growth. The median Ohio county changed by -0.2%, and the state as a whole by +0.7%.

Since the April 2020 estimates base, Montgomery County recorded 25,578 births and 29,869 deaths, a natural change of -4,291. Net international migration added +7,346 and net domestic migration, people moving to or from other US counties, came to -3,208. The largest single component was international migration, which added 7,346 people.

537.1k2020536.2k2021534.4k2022535.3k2023537.4k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
25,578
Deaths
29,869
Net international migration
+7,346
Net domestic migration
-3,208
Change, July 2023 to July 2024
+2,130

Where Montgomery County is

The Census internal point of Montgomery County is at 39.753700, -84.290600. It sits in UTM zone 16N. The map shades Ohio's 88 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Montgomery County outlined. Dots are towns of 1,000+ people with residents in it.

Shelby County: -0.4%Defiance County: +1.0%Darke County: -0.8%Seneca County: -0.6%Wood County: +0.6%Fayette County: -0.7%Clark County: -0.7%Hocking County: -2.2%Jackson County: +0.2%Miami County: +2.7%Richland County: -0.1%Union County: +13.7%Auglaize County: -1.2%Hancock County: +0.1%Morgan County: -1.6%Van Wert County: -0.1%Hardin County: -1.0%Paulding County: -0.3%Portage County: +1.2%Delaware County: +10.6%Harrison County: -3.1%Ross County: -1.3%Crawford County: -0.9%Clinton County: -0.0%Henry County: -0.5%Pike County: -0.0%Cuyahoga County: -1.7%Highland County: +1.0%Knox County: +1.7%Ottawa County: -1.5%Huron County: -0.6%Erie County: -2.2%Holmes County: +1.0%Lawrence County: -4.0%Marion County: -0.6%Fairfield County: +5.2%Putnam County: -0.6%Guernsey County: -0.5%Vinton County: -2.1%Gallia County: -1.2%Trumbull County: -0.7%Wayne County: -0.2%Perry County: +0.6%Ashland County: -0.1%Fulton County: -1.4%Brown County: +1.4%Lucas County: -1.1%Stark County: -0.1%Medina County: +1.1%Belmont County: -2.4%Williams County: -1.4%Mahoning County: -1.0%Noble County: +1.1%Greene County: +2.5%Preble County: -0.5%Allen County: -1.2%Athens County: +1.3%Jefferson County: -2.0%Adams County: +0.8%Monroe County: -2.3%Washington County: -2.2%Logan County: -0.1%Franklin County: +2.4%Warren County: +5.3%Wyandot County: -2.1%Licking County: +3.4%Hamilton County: +0.8%Clermont County: +2.6%Butler County: +2.2%Coshocton County: +1.1%Geauga County: -0.0%Sandusky County: -0.0%Ashtabula County: -0.6%Carroll County: -0.9%Tuscarawas County: -1.2%Morrow County: +2.7%Montgomery County: +0.1%Mercer County: +0.3%Lake County: -0.1%Pickaway County: +6.0%Madison County: +3.8%Muskingum County: +0.1%Meigs County: -3.0%Columbiana County: -1.8%Lorain County: +2.7%Scioto County: -2.8%Champaign County: +0.4%Summit County: -0.3%
Change 2020 to 2024
  1. < -1.4%
  2. < -0.6%
  3. < -0.0%
  4. < +1.1%
  5. ≥ +1.1%
no data

Orange pin: Montgomery County internal point. Dark pin: Columbus.

Internal point

Decimal
39.753700, -84.290600
DMS
39°45'13.32"N 84°17'26.16"W
UTM
16N 732118.3E 4403932.0N
Geohash
dph41uvqn
Plus code
86FQQP35+FQ

Towns in Montgomery County

19 incorporated places of 1,000+ people have residents in Montgomery County, 419,133 people together, or 78% of the county. Each figure counts only the part of the town inside Montgomery County; towns marked "part" extend into another county. The largest is Dayton with 136,346.

  1. 01Dayton136,346
  2. 02Kettering (part)56,298
  3. 03Huber Heights (part)37,801
  4. 04Centerville (part)26,308
  5. 05Riverside24,472
  6. 06Trotwood23,073
  7. 07Miamisburg20,253
  8. 08Vandalia15,013
  9. 09Clayton13,296
  10. 10Englewood13,282
  11. 11West Carrollton12,911
  12. 12Oakwood9,400
  13. 13Union (part)7,037
  14. 14Moraine6,603
  15. 15Brookville5,946
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Montgomery County

The Census 2024 county adjacency file lists 7 neighbors for Montgomery County. The most populous is Butler County, OH, with 399,542 residents. Distances run between Census internal points in a straight line.

Distance to Columbus and the nearest big city

Columbus is 69.9 miles ENE of Montgomery County's internal point in a straight line. The nearest place of 100,000 or more is Dayton, OH (population 136,346), 5.3 miles away. The nearest place of 10,000 or more is Trotwood, OH (population 23,073), 3.1 miles away.

Montgomery County FIPS code

The FIPS code of Montgomery County is 39113: state code 39 for Ohio plus county code 113. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $62,650.

Questions people ask

What is the population of Montgomery County, Ohio?

The Census Vintage 2024 estimate for July 1, 2024 is 537,443. That is up 304 people (0.1%) from the July 2020 estimate of 537,139.

What is the FIPS code of Montgomery County?

39113. The first two digits (39) are Ohio; the last three (113) identify the county.

What is the largest town in Montgomery County?

Dayton, with 136,346 residents inside Montgomery County in 2024.

Which counties border Montgomery County?

7 county-equivalents border it in the Census 2024 adjacency file: Butler County, OH; Warren County, OH; Greene County, OH; Clark County, OH; Miami County, OH; Darke County, OH; Preble County, OH.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.