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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
Illinois
229/sq mi
Rankings
Full list

Top and bottom zip codes in Illinois

Zip codes with 1,000+ residents

Most densely populated zip codes

See all
  1. 160611Chicago47,547/sq mi
  2. 260654Chicago47,519/sq mi
  3. 360610Chicago40,362/sq mi
  4. 460601Chicago39,165/sq mi
  5. 560661Chicago37,248/sq mi
  6. 660660Chicago33,535/sq mi
  7. 760657Chicago33,059/sq mi
  8. 860626Chicago28,941/sq mi
  9. 960640Chicago27,719/sq mi
  10. 1060605Chicago25,322/sq mi

Most sparsely populated zip codes

See all
  1. 162367Plymouth10/sq mi
  2. 262355Nebo12/sq mi
  3. 362627Chandlerville12/sq mi
  4. 461473Roseville12/sq mi
  5. 561421Bradford12/sq mi
  6. 662324Clayton13/sq mi
  7. 761415Avon13/sq mi
  8. 862546Morrisonville13/sq mi
  9. 961259Illinois City14/sq mi
  10. 1060953Milford14/sq mi

Population density by county in Illinois

  1. 1Cook County5,484/sq mi
  2. 2DuPage County2,837/sq mi
  3. 3Lake County1,610/sq mi
  4. 4Kane County996/sq mi
  5. 5Will County839/sq mi
  6. 6Winnebago County552/sq mi
  7. 7McHenry County518/sq mi
  8. 8Kendall County430/sq mi
  9. 9St. Clair County386/sq mi
  10. 10Madison County369/sq mi
  11. 11Rock Island County334/sq mi
  12. 12Peoria County290/sq mi
  13. 13Sangamon County225/sq mi
  14. 14Champaign County210/sq mi
  15. 15Tazewell County202/sq mi
  16. 16Boone County190/sq mi
  17. 17Macon County175/sq mi
  18. 18DeKalb County160/sq mi
  19. 19Williamson County159/sq mi
  20. 20Kankakee County158/sq mi
  21. 21McLean County145/sq mi
  22. 22Grundy County127/sq mi
  23. 23LaSalle County96/sq mi
  24. 24Coles County92/sq mi
  25. 25Franklin County91/sq mi
  26. 26Jackson County91/sq mi
  27. 27Monroe County91/sq mi
  28. 28Vermilion County81/sq mi
  29. 29Whiteside County80/sq mi
  30. 30Clinton County78/sq mi
  31. 31Stephenson County78/sq mi
  32. 32Adams County76/sq mi
  33. 33Woodford County73/sq mi
  34. 34Effingham County72/sq mi
  35. 35Knox County69/sq mi
  36. 36Ogle County68/sq mi
  37. 37Marion County65/sq mi
  38. 38Jefferson County64/sq mi
  39. 39Saline County61/sq mi
  40. 40Henry County59/sq mi
  41. 41Massac County59/sq mi
  42. 42Morgan County58/sq mi
  43. 43Jersey County58/sq mi
  44. 44Randolph County52/sq mi
  45. 45Macoupin County51/sq mi
  46. 46Wabash County50/sq mi
  47. 47Douglas County47/sq mi
  48. 48Christian County47/sq mi
  49. 49Lee County47/sq mi
  50. 50Perry County47/sq mi
  51. 51McDonough County46/sq mi
  52. 52Logan County45/sq mi
  53. 53Bond County44/sq mi
  54. 54Richland County43/sq mi
  55. 55Moultrie County43/sq mi
  56. 56Crawford County42/sq mi
  57. 57Union County41/sq mi
  58. 58Lawrence County40/sq mi
  59. 59Montgomery County40/sq mi
  60. 60Johnson County39/sq mi
  61. 61De Witt County39/sq mi
  62. 62Menard County39/sq mi
  63. 63Fulton County38/sq mi
  64. 64Piatt County38/sq mi
  65. 65Bureau County38/sq mi
  66. 66Jo Daviess County36/sq mi
  67. 67Carroll County35/sq mi
  68. 68Putnam County35/sq mi
  69. 69Livingston County34/sq mi
  70. 70Cass County34/sq mi
  71. 71Clark County30/sq mi
  72. 72Warren County30/sq mi
  73. 73Marshall County30/sq mi
  74. 74Cumberland County30/sq mi
  75. 75Fayette County30/sq mi
  76. 76Clay County28/sq mi
  77. 77Ford County28/sq mi
  78. 78Mercer County28/sq mi
  79. 79White County28/sq mi
  80. 80Edwards County27/sq mi
  81. 81Shelby County27/sq mi
  82. 82Edgar County27/sq mi
  83. 83Pulaski County25/sq mi
  84. 84Washington County24/sq mi
  85. 85Iroquois County24/sq mi
  86. 86Mason County24/sq mi
  87. 87Wayne County22/sq mi
  88. 88Hancock County22/sq mi
  89. 89Greene County22/sq mi
  90. 90Alexander County21/sq mi
  91. 91Brown County21/sq mi
  92. 92Hardin County20/sq mi
  93. 93Scott County20/sq mi
  94. 94Jasper County19/sq mi
  95. 95Stark County18/sq mi
  96. 96Hamilton County18/sq mi
  97. 97Pike County17/sq mi
  98. 98Calhoun County17/sq mi
  99. 99Henderson County16/sq mi
  100. 100Schuyler County16/sq mi
  101. 101Gallatin County15/sq mi
  102. 102Pope County10/sq mi

Questions about this map

Which zip code has the highest population density in Illinois?

Among zip codes with at least 1,000 residents, 60611 (Chicago, IL) has the highest: 47,547/sq mi.

Which zip code has the lowest population density in Illinois?

62367 (Plymouth, IL) has the lowest: 10/sq mi.

What is the population density for the United States?

95/sq mi; in Illinois it is 229/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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