• county
  • FIPS 24031
  • Largest town: Gaithersburg

Montgomery County, Maryland

Montgomery County had 1,082,273 residents in the Census Vintage 2024 estimate, on 493.2 square miles of land. It is the most populous of Maryland's 24 county-equivalents.

Population
1,082,273
#1 of 24 in Maryland · #44 in US
Area
493.2 sq mi
#5 of 24 in Maryland · #2,108 in US
Density
2,195 / sq mi
#2 of 24 in Maryland · #65 in US
Median household income
$125,076
#2 of 24 in Maryland · #24 in US

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

Montgomery County within Maryland. Pin: Annapolis.

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Tools and pages that start from Montgomery County

Montgomery County population, land area and income

Montgomery County had 1,082,273 residents in the Census Vintage 2024 estimate, on 493.2 square miles of land. It is the most populous of Maryland's 24 county-equivalents. That works out to 2,194.6 people per square mile, 22.8 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Maryland has 111,399 residents, so Montgomery County is 9.7 times that size.

Its SAIPE 2023 median household income of $125,076 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

1,082,273

3144th1st

44th of 3,144 (US)

Land area

493 sq mi

3144th1st

2108th of 3,144 (US)

Density

2,194.6 / sq mi

3144th1st

65th of 3,144 (US)

Median household income

$125,076

3143rd1st

24th of 3,143 (US)

Rank within Maryland (24)

Population

1,082,273

24th1st

1st of 24 (MD)

Land area

493 sq mi

24th1st

5th of 24 (MD)

Density

2,194.6 / sq mi

24th1st

2nd of 24 (MD)

Median household income

$125,076

24th1st

2nd of 24 (MD)

How Montgomery County's population changed since 2020

Montgomery County gained 21,417 residents between the July 2020 and July 2024 estimates, a rise of 2.0%. That ranks 14th of 24 in Maryland for growth. The median Maryland county changed by +2.1%, and the state as a whole by +1.4%.

Since the April 2020 estimates base, Montgomery County recorded 48,845 births and 29,893 deaths, a natural change of +18,952. Net international migration added +51,856 and net domestic migration, people moving to or from other US counties, came to -51,368. The largest single component was international migration, which added 51,856 people.

1.06M20201.06M20211.06M20221.07M20231.08M2024
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
48,845
Deaths
29,893
Net international migration
+51,856
Net domestic migration
-51,368
Change, July 2023 to July 2024
+12,876

Where Montgomery County is

The Census internal point of Montgomery County is at 39.137400, -77.203100. It sits in UTM zone 18N. The map shades Maryland's 24 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.

Caroline County: +2.9%Washington County: +1.6%Allegany County: -1.3%Carroll County: +2.4%Baltimore County: -0.1%Baltimore city: -2.6%Anne Arundel County: +1.5%Cecil County: +2.4%Dorchester County: +1.9%Garrett County: -1.4%Harford County: +1.6%St. Mary's County: +2.2%Talbot County: +1.9%Worcester County: +3.5%Charles County: +4.7%Frederick County: +9.7%Wicomico County: +2.7%Somerset County: +2.7%Howard County: +2.1%Calvert County: +2.1%Kent County: +2.3%Prince George's County: +0.1%Montgomery County: +2.0%Queen Anne's County: +7.3%
Change 2020 to 2024
  1. < +0.1%
  2. < +1.9%
  3. < +2.2%
  4. < +2.7%
  5. ≥ +2.7%
no data

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

Internal point

Decimal
39.137400, -77.203100
DMS
39°08'14.64"N 77°12'11.16"W
UTM
18N 309589.6E 4334335.4N
Geohash
dqcnehwrv
Plus code
87F44QPW+XQ

Towns in Montgomery County

10 incorporated places of 1,000+ people have residents in Montgomery County, 173,192 people together, or 16% 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 Gaithersburg with 70,686.

  1. 01Gaithersburg70,686
  2. 02Rockville68,417
  3. 03Takoma Park17,856
  4. 04Poolesville5,856
  5. 05Chevy Chase2,927
  6. 06Kensington2,155
  7. 07Chevy Chase Village2,071
  8. 08Somerset1,203
  9. 09Chevy Chase View1,017
  10. 10Garrett Park1,004
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, including 4 across a state line. The most populous is Fairfax County, VA, with 1,160,925 residents. Distances run between Census internal points in a straight line.

Distance to Annapolis and the nearest big city

Annapolis is 39.7 miles ESE of Montgomery County's internal point in a straight line. The nearest place of 100,000 or more is Washington, DC (population 702,250), 19.0 miles away. The nearest place of 10,000 or more is Gaithersburg, MD (population 70,686), 0.9 miles away.

Montgomery County FIPS code

The FIPS code of Montgomery County is 24031: state code 24 for Maryland plus county code 031. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $125,076.

Questions people ask

What is the population of Montgomery County, Maryland?

The Census Vintage 2024 estimate for July 1, 2024 is 1,082,273. That is up 21,417 people (2.0%) from the July 2020 estimate of 1,060,856.

What is the FIPS code of Montgomery County?

24031. The first two digits (24) are Maryland; the last three (031) identify the county.

What is the largest town in Montgomery County?

Gaithersburg, with 70,686 residents inside Montgomery County in 2024.

Which counties border Montgomery County?

7 county-equivalents border it in the Census 2024 adjacency file: Fairfax County, VA; Prince George's County, MD; District of Columbia, DC; Loudoun County, VA; Howard County, MD; Frederick County, MD; Arlington County, VA.

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.