Data / Rankings / Housing units / Counties in Maryland

Counties in Maryland by housing units

Montgomery County had the highest housing units of 24 counties in 2021, at 401,942. Kent County had the lowest, at 10,344. The median was 50,682 and the figure for Maryland was 2.52 million. Source: the U.S. Census Bureau.

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Highest401,942Montgomery County
Lowest10,344Kent County
Median50,68224 counties
Maryland2,516,341History

Map of counties, 2021

Allegany County: 32,927 countAnne Arundel County: 231,310 countBaltimore County: 348,239 countCalvert County: 35,501 countCaroline County: 13,466 countCarroll County: 65,500 countCecil County: 43,787 countCharles County: 61,718 countDorchester County: 16,433 countFrederick County: 101,980 countGarrett County: 18,509 countHarford County: 102,686 countHoward County: 122,208 countKent County: 10,344 countMontgomery County: 401,942 countPrince George's County: 356,061 countQueen Anne's County: 21,172 countSt. Mary's County: 45,138 countSomerset County: 10,951 countTalbot County: 19,597 countWashington County: 63,432 countWicomico County: 43,497 countWorcester County: 56,225 countBaltimore city: 293,718 count
  • Under 19K
  • 19K to 44K
  • 44K to 63K
  • 63K to 170K
  • 170K and over
count, 2021. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25001: total housing units. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Montgomery County: 401,942 countMontgomery County401,942Prince George's County: 356,061 countPrince George's County356,061Baltimore County: 348,239 countBaltimore County348,239Baltimore city: 293,718 countBaltimore city293,718Anne Arundel County: 231,310 countAnne Arundel County231,310Howard County: 122,208 countHoward County122,208Harford County: 102,686 countHarford County102,686Frederick County: 101,980 countFrederick County101,980Carroll County: 65,500 countCarroll County65,500Washington County: 63,432 countWashington County63,432Charles County: 61,718 countCharles County61,718Worcester County: 56,225 countWorcester County56,225St. Mary's County: 45,138 countSt. Mary's County45,138Cecil County: 43,787 countCecil County43,787Wicomico County: 43,497 countWicomico County43,497Calvert County: 35,501 countCalvert County35,501Allegany County: 32,927 countAllegany County32,927Queen Anne's County: 21,172 countQueen Anne's County21,172Talbot County: 19,597 countTalbot County19,597Garrett County: 18,509 countGarrett County18,509Dorchester County: 16,433 countDorchester County16,433Caroline County: 13,466 countCaroline County13,466Somerset County: 10,951 countSomerset County10,951Kent County: 10,344 countKent County10,344Montgomery County: 401,942 countMontgomery County401,942Prince George's County: 356,061 countPrince George's County356,061Baltimore County: 348,239 countBaltimore County348,239Baltimore city: 293,718 countBaltimore city293,718Anne Arundel County: 231,310 countAnne Arundel County231,310Howard County: 122,208 countHoward County122,208Harford County: 102,686 countHarford County102,686Frederick County: 101,980 countFrederick County101,980Carroll County: 65,500 countCarroll County65,500Washington County: 63,432 countWashington County63,432Charles County: 61,718 countCharles County61,718Worcester County: 56,225 countWorcester County56,225St. Mary's County: 45,138 countSt. Mary's County45,138Cecil County: 43,787 countCecil County43,787Wicomico County: 43,497 countWicomico County43,497Calvert County: 35,501 countCalvert County35,501Allegany County: 32,927 countAllegany County32,927Queen Anne's County: 21,172 countQueen Anne's County21,172Talbot County: 19,597 countTalbot County19,597Garrett County: 18,509 countGarrett County18,509Dorchester County: 16,433 countDorchester County16,433Caroline County: 13,466 countCaroline County13,466Somerset County: 10,951 countSomerset County10,951Kent County: 10,344 countKent County10,344
count. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25001: total housing units. Retrieved 2026-10-12.

Full ranking

RankCounties2021
count
1Montgomery County401,942
2Prince George's County356,061
3Baltimore County348,239
4Baltimore city293,718
5Anne Arundel County231,310
6Howard County122,208
7Harford County102,686
8Frederick County101,980
9Carroll County65,500
10Washington County63,432
11Charles County61,718
12Worcester County56,225
13St. Mary's County45,138
14Cecil County43,787
15Wicomico County43,497
16Calvert County35,501
17Allegany County32,927
18Queen Anne's County21,172
19Talbot County19,597
20Garrett County18,509
21Dorchester County16,433
22Caroline County13,466
23Somerset County10,951
24Kent County10,344

Other periods

About this ranking

All housing units, occupied and vacant: houses, apartments, mobile homes and rooms intended as separate living quarters. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

A survey estimate averaged over five years, not a count on one date.

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 B25001: total housing units. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.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 B25001: total housing units (Counties in Maryland by housing units, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat

MLA 9

American Community Survey 5-year estimates, table B25001: total housing units, Counties in Maryland by housing units, 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat. Invokely, https://invokely.ai/rankings/housing-units/maryland-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B25001: total housing units. Counties in Maryland by housing units, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat. Also distributed by Invokely, https://invokely.ai/rankings/housing-units/maryland-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B25001: total housing units, Counties in Maryland by housing units, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat, via Invokely: https://invokely.ai/rankings/housing-units/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 B25001: total housing units: Counties in Maryland by housing units, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/housing-units/maryland-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25001: total housing units. https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B25001: total housing units: Counties in Maryland by housing units, 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-b25001.dat
L2  - https://invokely.ai/rankings/housing-units/maryland-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/housing-units/maryland-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25001: total housing units. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest housing units?

Montgomery County, with 401,942 in 2021, according to the U.S. Census Bureau.

Which county has the lowest housing units?

Kent County, with 10,344 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 B25001: total housing units. Retrieved 2026-10-12.

Housing units: other rankings

Counties in Maryland: more rankings