Counties in Maryland by households

Montgomery County had the highest households of 24 counties in 2021, at 383,308. Somerset County had the lowest, at 8,113. The median was 39,844 and the figure for Maryland was 2.29 million. Source: the U.S. Census Bureau.

Highest383,308Montgomery County

Lowest8,113Somerset County

Median39,84424 counties

Maryland2,294,270History

Map of counties, 2021

Under 15K
15K to 34K
34K to 59K
59K to 160K
160K and over

count, 2021. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25003: occupied housing units (households). Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

count. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25003: occupied housing units (households). Retrieved 2026-10-12.

Full ranking

Rank	Counties	2021 count
1	Montgomery County	383,308
2	Prince George's County	337,366
3	Baltimore County	326,932
4	Baltimore city	244,893
5	Anne Arundel County	218,682
6	Howard County	118,037
7	Frederick County	97,615
8	Harford County	97,468
9	Carroll County	62,907
10	Washington County	58,630
11	Charles County	58,138
12	St. Mary's County	40,236
13	Wicomico County	39,452
14	Cecil County	38,672
15	Calvert County	32,751
16	Allegany County	27,563
17	Worcester County	22,573
18	Queen Anne's County	18,914
19	Talbot County	16,251
20	Dorchester County	13,123
21	Garrett County	12,392
22	Caroline County	11,963
23	Kent County	8,291
24	Somerset County	8,113

Other periods

2024
2023
2022
2021

About this ranking

Number of households, which equals the number of occupied housing units. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

People living in group quarters, such as college dormitories, nursing homes and prisons, are not in households.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B25003: occupied housing units (households). https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). American Community Survey 5-year estimates, table B25003: occupied housing units (households) (Counties in Maryland by households, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat

MLA 9

American Community Survey 5-year estimates, table B25003: occupied housing units (households), Counties in Maryland by households, 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat. Invokely, https://invokely.ai/rankings/households/maryland-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B25003: occupied housing units (households). Counties in Maryland by households, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat. Also distributed by Invokely, https://invokely.ai/rankings/households/maryland-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B25003: occupied housing units (households), Counties in Maryland by households, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat, via Invokely: https://invokely.ai/rankings/households/maryland-counties?period=2021 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_maryland_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B25003: occupied housing units (households): Counties in Maryland by households, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/households/maryland-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25003: occupied housing units (households). https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat. Retrieved 2026-10-12.},
}

RIS

TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B25003: occupied housing units (households): Counties in Maryland by households, 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat
L2  - https://invokely.ai/rankings/households/maryland-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/households/maryland-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25003: occupied housing units (households). https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat. Retrieved 2026-10-12.
ER  -

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Questions

Which county has the highest households?

Montgomery County, with 383,308 in 2021, according to the U.S. Census Bureau.

Which county has the lowest households?

Somerset County, with 8,113 in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B25003: occupied housing units (households). Retrieved 2026-10-12.