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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
Washington
118/sq mi
Rankings
Full list

Top and bottom zip codes in Washington

Zip codes with 1,000+ residents

Most densely populated zip codes

See all
  1. 198121Seattle47,671/sq mi
  2. 298101Seattle32,487/sq mi
  3. 398102Seattle21,238/sq mi
  4. 498122Seattle18,508/sq mi
  5. 598109Seattle17,741/sq mi
  6. 698104Seattle17,505/sq mi
  7. 798107Seattle13,194/sq mi
  8. 898105Seattle12,970/sq mi
  9. 998103Seattle11,475/sq mi
  10. 1098119Seattle11,084/sq mi

Most sparsely populated zip codes

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  1. 199138Inchelium2/sq mi
  2. 299159Odessa3/sq mi
  3. 399348Prescott3/sq mi
  4. 499155Nespelem3/sq mi
  5. 599115Coulee City3/sq mi
  6. 699347Pomeroy3/sq mi
  7. 799139Ione4/sq mi
  8. 899169Ritzville4/sq mi
  9. 999032Sprague4/sq mi
  10. 1098326Clallam Bay4/sq mi

Population density by county in Washington

  1. 1King County1,081/sq mi
  2. 2Clark County823/sq mi
  3. 3Kitsap County703/sq mi
  4. 4Pierce County558/sq mi
  5. 5Island County417/sq mi
  6. 6Thurston County414/sq mi
  7. 7Snohomish County405/sq mi
  8. 8Spokane County311/sq mi
  9. 9Benton County125/sq mi
  10. 10Whatcom County109/sq mi
  11. 11San Juan County106/sq mi
  12. 12Cowlitz County99/sq mi
  13. 13Franklin County80/sq mi
  14. 14Skagit County76/sq mi
  15. 15Mason County71/sq mi
  16. 16Yakima County60/sq mi
  17. 17Walla Walla County49/sq mi
  18. 18Clallam County45/sq mi
  19. 19Grays Harbor County41/sq mi
  20. 20Grant County38/sq mi
  21. 21Lewis County35/sq mi
  22. 22Asotin County35/sq mi
  23. 23Chelan County27/sq mi
  24. 24Pacific County26/sq mi
  25. 25Douglas County24/sq mi
  26. 26Whitman County22/sq mi
  27. 27Kittitas County21/sq mi
  28. 28Stevens County19/sq mi
  29. 29Jefferson County19/sq mi
  30. 30Wahkiakum County18/sq mi
  31. 31Klickitat County13/sq mi
  32. 32Adams County11/sq mi
  33. 33Pend Oreille County10/sq mi
  34. 34Okanogan County8/sq mi
  35. 35Skamania County8/sq mi
  36. 36Lincoln County5/sq mi
  37. 37Columbia County5/sq mi
  38. 38Ferry County3/sq mi
  39. 39Garfield County3/sq mi

Questions about this map

Which zip code has the highest population density in Washington?

Among zip codes with at least 1,000 residents, 98121 (Seattle, WA) has the highest: 47,671/sq mi.

Which zip code has the lowest population density in Washington?

99138 (Inchelium, WA) has the lowest: 2/sq mi.

What is the population density for the United States?

95/sq mi; in Washington it is 118/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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