• county
  • FIPS 42091
  • Largest town: Norristown

Montgomery County, Pennsylvania

Montgomery County had 879,190 residents in the Census Vintage 2024 estimate, on 482.9 square miles of land. It ranks 3rd of 67 in Pennsylvania by population and 47th by land area.

Population
879,190
#3 of 67 in Pennsylvania · #70 in US
Area
482.9 sq mi
#47 of 67 in Pennsylvania · #2,144 in US
Density
1,820 / sq mi
#3 of 67 in Pennsylvania · #81 in US
Median household income
$106,780
#3 of 67 in Pennsylvania · #82 in US

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

Montgomery County within Pennsylvania. Pin: Harrisburg.

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Tools and pages that start from Montgomery County

Montgomery County population, land area and income

Montgomery County had 879,190 residents in the Census Vintage 2024 estimate, on 482.9 square miles of land. It ranks 3rd of 67 in Pennsylvania by population and 47th by land area. That works out to 1,820.5 people per square mile, 18.9 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Pennsylvania has 82,953 residents, so Montgomery County is 10.6 times that size.

Its SAIPE 2023 median household income of $106,780 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

879,190

3144th1st

70th of 3,144 (US)

Land area

483 sq mi

3144th1st

2144th of 3,144 (US)

Density

1,820.5 / sq mi

3144th1st

81st of 3,144 (US)

Median household income

$106,780

3143rd1st

82nd of 3,143 (US)

Rank within Pennsylvania (67)

Population

879,190

67th1st

3rd of 67 (PA)

Land area

483 sq mi

67th1st

47th of 67 (PA)

Density

1,820.5 / sq mi

67th1st

3rd of 67 (PA)

Median household income

$106,780

67th1st

3rd of 67 (PA)

How Montgomery County's population changed since 2020

Montgomery County gained 22,290 residents between the July 2020 and July 2024 estimates, a rise of 2.6%. That ranks 9th of 67 in Pennsylvania for growth. The median Pennsylvania county changed by -0.5%, and the state as a whole by +0.6%.

Since the April 2020 estimates base, Montgomery County recorded 35,977 births and 35,376 deaths, a natural change of +601. Net international migration added +13,915 and net domestic migration, people moving to or from other US counties, came to +8,289. The largest single component was international migration, which added 13,915 people.

856.9k2020864.3k2021865.8k2022871.7k2023879.2k2024
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
35,977
Deaths
35,376
Net international migration
+13,915
Net domestic migration
+8,289
Change, July 2023 to July 2024
+7,517

Where Montgomery County is

The Census internal point of Montgomery County is at 40.210000, -75.370200. It sits in UTM zone 18N. The map shades Pennsylvania's 67 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.

Adams County: +4.0%Potter County: -2.4%Sullivan County: +1.6%Bucks County: +0.6%Carbon County: +1.5%McKean County: -2.3%Montour County: -0.1%Fulton County: -0.9%Columbia County: +2.0%Cameron County: -4.1%Elk County: -2.6%Bradford County: -0.4%Bedford County: +0.1%York County: +3.2%Monroe County: -1.1%Forest County: -5.2%Berks County: +2.4%Cambria County: -2.3%Franklin County: +2.1%Snyder County: -0.3%Somerset County: -2.5%Clarion County: -0.9%Indiana County: -0.2%Lackawanna County: +0.6%Wyoming County: -1.0%Lawrence County: -2.0%Mercer County: -2.2%Lehigh County: +3.0%Northampton County: +3.3%Cumberland County: +5.9%Fayette County: -3.6%Jefferson County: -2.5%Centre County: +1.2%Lebanon County: +1.4%Union County: -1.2%Clinton County: +1.3%Chester County: +4.8%Montgomery County: +2.6%Wayne County: +0.5%Pike County: +6.5%Susquehanna County: -0.6%Allegheny County: -1.4%Clearfield County: -2.9%Butler County: +2.7%Beaver County: -1.4%Crawford County: -2.1%Washington County: +0.5%Venango County: -1.7%Warren County: -3.0%Blair County: -2.0%Huntingdon County: -1.6%Lancaster County: +1.9%Luzerne County: +1.9%Westmoreland County: -1.0%Juniata County: -0.4%Armstrong County: -2.7%Tioga County: -0.8%Delaware County: +1.4%Northumberland County: -1.7%Mifflin County: -0.5%Lycoming County: -0.8%Perry County: +2.1%Philadelphia County: -1.7%Schuylkill County: +1.1%Dauphin County: +2.2%Greene County: -5.3%Erie County: -1.1%
Change 2020 to 2024
  1. < -2.2%
  2. < -1.0%
  3. < +0.1%
  4. < +1.9%
  5. ≥ +1.9%
no data

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

Internal point

Decimal
40.210000, -75.370200
DMS
40°12'36.00"N 75°22'12.72"W
UTM
18N 468496.8E 4451131.3N
Geohash
dr4kubj05
Plus code
87G66J6H+2W

Towns in Montgomery County

23 incorporated places of 1,000+ people have residents in Montgomery County, 165,928 people together, or 19% 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 Norristown with 36,075.

  1. 01Norristown36,075
  2. 02Pottstown23,553
  3. 03Lansdale19,154
  4. 04Conshohocken9,342
  5. 05Hatboro8,341
  6. 06Souderton7,274
  7. 07Ambler6,900
  8. 08Bridgeport5,401
  9. 09Collegeville5,308
  10. 10Royersford4,958
  11. 11Jenkintown4,740
  12. 12Narberth4,530
  13. 13Pennsburg4,079
  14. 14Trappe4,077
  15. 15Hatfield3,514
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Montgomery County

The Census 2024 county adjacency file lists 6 neighbors for Montgomery County. The most populous is Philadelphia County, PA, with 1,573,916 residents. Distances run between Census internal points in a straight line.

Distance to Harrisburg and the nearest big city

Harrisburg is 79.9 miles W of Montgomery County's internal point in a straight line. The nearest place of 100,000 or more is Philadelphia, PA (population 1,573,916), 18.7 miles away. The nearest place of 10,000 or more is Lansdale, PA (population 19,154), 5.2 miles away.

Montgomery County FIPS code

The FIPS code of Montgomery County is 42091: state code 42 for Pennsylvania plus county code 091. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $106,780.

Questions people ask

What is the population of Montgomery County, Pennsylvania?

The Census Vintage 2024 estimate for July 1, 2024 is 879,190. That is up 22,290 people (2.6%) from the July 2020 estimate of 856,900.

What is the FIPS code of Montgomery County?

42091. The first two digits (42) are Pennsylvania; the last three (091) identify the county.

What is the largest town in Montgomery County?

Norristown, with 36,075 residents inside Montgomery County in 2024.

Which counties border Montgomery County?

6 county-equivalents border it in the Census 2024 adjacency file: Philadelphia County, PA; Bucks County, PA; Delaware County, PA; Chester County, PA; Berks County, PA; Lehigh County, PA.

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.