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About this map

Residents per square mile of land (water excluded). Under 50 is rural, a few hundred is small-town, 2,500+ is urban, and 10,000+ is big-city dense.

Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024).

U.S.
95/sq mi
Maryland
639/sq mi
Rankings
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Top and bottom zip codes in Maryland

Zip codes with 1,000+ residents

Most densely populated zip codes

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  1. 121252Towson19,538/sq mi
  2. 221231Baltimore17,265/sq mi
  3. 321217Baltimore14,525/sq mi
  4. 421201Baltimore14,415/sq mi
  5. 520742College Park13,509/sq mi
  6. 620712Mount Rainier13,100/sq mi
  7. 721202Baltimore12,799/sq mi
  8. 821250Baltimore11,567/sq mi
  9. 921218Baltimore10,167/sq mi
  10. 1020910Silver Spring9,996/sq mi

Most sparsely populated zip codes

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  1. 121555Oldtown15/sq mi
  2. 221530Flintstone23/sq mi
  3. 321561Swanton24/sq mi
  4. 421871Westover26/sq mi
  5. 521856Quantico31/sq mi
  6. 621520Accident34/sq mi
  7. 721838Marion Station34/sq mi
  8. 821659Rhodesdale37/sq mi
  9. 920662Nanjemoy38/sq mi
  10. 1021536Grantsville39/sq mi

Population density by county in Maryland

  1. 1Baltimore city7,082/sq mi
  2. 2Montgomery County2,162/sq mi
  3. 3Prince George's County1,989/sq mi
  4. 4Anne Arundel County1,442/sq mi
  5. 5Baltimore County1,422/sq mi
  6. 6Howard County1,340/sq mi
  7. 7Harford County603/sq mi
  8. 8Calvert County442/sq mi
  9. 9Frederick County435/sq mi
  10. 10Carroll County392/sq mi
  11. 11Charles County373/sq mi
  12. 12Washington County340/sq mi
  13. 13St. Mary's County321/sq mi
  14. 14Cecil County303/sq mi
  15. 15Wicomico County280/sq mi
  16. 16Allegany County160/sq mi
  17. 17Talbot County141/sq mi
  18. 18Queen Anne's County139/sq mi
  19. 19Worcester County115/sq mi
  20. 20Caroline County105/sq mi
  21. 21Somerset County78/sq mi
  22. 22Kent County70/sq mi
  23. 23Dorchester County61/sq mi
  24. 24Garrett County44/sq mi

Questions about this map

Which zip code has the highest population density in Maryland?

Among zip codes with at least 1,000 residents, 21252 (Towson, MD) has the highest: 19,538/sq mi.

Which zip code has the lowest population density in Maryland?

21555 (Oldtown, MD) has the lowest: 15/sq mi.

What is the population density for the United States?

95/sq mi; in Maryland it is 639/sq mi.

Where does this data come from?

U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024). Residents per square mile of land (water excluded). Under 50 is rural, a few hundred is small-town, 2,500+ is urban, and 10,000+ is big-city dense.

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