| Rank | City | 2008 Population (Est.) | Growth Rate (Annual) |
|---|---|---|---|
| 1 | Pingree Grove | 3,336 | 50.9% |
| 2 | Gilberts | 5,603 | 23.3% |
| 3 | Huntley | 21,787 | 19.6% |
| 4 | Indian Creek | 594 | 17.3% |
| 5 | Sumner | 2,978 | 16.6% |
| 6 | Round Lake | 16,687 | 15.7% |
| 7 | Montgomery | 14,588 | 14.6% |
| 8 | Plainfield | 35,177 | 14.4% |
| 9 | Minooka | 10,189 | 13.9% |
| 10 | Timberlane | 579 | 12.6% |
| 11 | Yorkville | 15,045 | 12.5% |
| 12 | Sugar Grove | 9,264 | 12.3% |
| 13 | Davis Junction | 2,128 | 12.2% |
| 14 | Poplar Grove | 3,846 | 10.9% |
| 15 | Round Lake Heights | 2,805 | 10.8% |
| 16 | Oswego | 27,687 | – |
| 17 | Plano | 11,315 | 10.3% |
| 18 | Richmond | 2,275 | 10.0% |
| 19 | Manhattan | 6,602 | 9.9% |
| 20 | Lakemoor | 5,521 | 9.5% |
| 21 | Prairie Grove | 1,945 | 9.5% |
| 22 | Valmeyer | 1,139 | 9.2% |
| 23 | Ohlman | 144 | 9.2% |
| 24 | Cortland | 3,888 | 8.9% |
| 25 | Shorewood | 14,754 | 8.9% |
| 26 | Elburn | 5,145 | 8.9% |
| 27 | East Carondelet | 580 | 8.5% |
| 28 | Romeoville | 37,860 | 8.0% |
| 29 | Channahon | 13,561 | 8.0% |
| 30 | Hainesville | 3,658 | – |
| 31 | Diamond | 2,354 | 7.6% |
| 32 | Port Barrington | 1,424 | 7.3% |
| 33 | Monee | 4,962 | 7.2% |
| 34 | Frankfort | 17,273 | 7.1% |
| 35 | Maple Park | 1,243 | 6.8% |
| 36 | Hampshire | 4,680 | 6.6% |
| 37 | Lockport | 24,172 | – |
| 38 | Lakewood | 3,589 | 6.0% |
| 39 | Antioch | 13,522 | 5.9% |
| 40 | Capron | 1,660 | 5.8% |
| 41 | Crest Hill | 20,268 | 5.8% |
| 42 | Maryville | 7,128 | 5.5% |
| 43 | Kirkland | 1,696 | – |
| 44 | North Aurora | 15,545 | 5.1% |
| 45 | Spring Grove | 5,649 | 5.1% |
| 46 | Smithton | 3,355 | 5.0% |
| 47 | Elwood | 2,314 | – |
| 48 | Spaulding | 809 | 4.8% |
| 49 | West Dundee | 7,842 | 4.8% |
| 50 | Roscoe | 8,784 | 4.7% |
| 51 | Beecher | 2,942 | 4.7% |
| 52 | Sycamore | 17,145 | 4.7% |
| 53 | Lake Villa | 8,534 | 4.7% |
| 54 | Germantown Hills | 3,132 | 4.6% |
| 55 | Hamel | 768 | 4.3% |
| 56 | St. Joseph | 3,961 | 4.2% |
| 57 | Kaneville | 600 | 4.1% |
| 58 | Joliet | 143,158 | – |
| 59 | Mettawa | 492 | 4.0% |
| 60 | Aviston | 1,664 | 4.0% |
| 61 | Algonquin | 30,221 | – |
| 62 | Manteno | 8,496 | 3.8% |
| 63 | Bannockburn | 1,860 | – |
| 64 | Wonder Lake | 3,740 | – |
| 65 | New Lenox | 23,760 | 3.7% |
| 66 | Matteson | 16,814 | 3.7% |
| 67 | Mokena | 18,869 | – |
| 68 | Sherman | 3,709 | 3.6% |
| 69 | Beach Park | 12,957 | 3.5% |
| 70 | Hawthorn Woods | 7,796 | 3.5% |
| 71 | Newark | 1,123 | – |
| 72 | Shiloh | 10,926 | 3.3% |
| 73 | Essex | 692 | 3.3% |
| 74 | South Elgin | 20,699 | – |
| 75 | Braidwood | 6,602 | 3.3% |
| 76 | Cary | 19,498 | – |
| 77 | Lebanon | 4,402 | 3.1% |
| 78 | Byron | 3,765 | 3.1% |
| 79 | Bolingbrook | 70,390 | 3.1% |
| 80 | Mahomet | 6,188 | 3.0% |
| 81 | Somonauk | 1,776 | 3.0% |
| 82 | Peotone | 4,205 | 3.0% |
| 83 | Wauconda | 11,896 | 3.0% |
| 84 | Lake in the Hills | 29,567 | – |
| 85 | Belvidere | 26,049 | – |
| 86 | Savoy | 5,526 | 3.0% |
| 87 | Lincolnshire | 7,523 | 2.9% |
| 88 | Bourbonnais | 18,735 | – |
| 89 | O'Fallon | 27,044 | – |
| 90 | Johnsburg | 6,607 | 2.8% |
| 91 | Grantfork | 314 | 2.8% |
| 92 | Harvard | 9,839 | 2.7% |
| 93 | Metamora | 3,306 | – |
| 94 | Philo | 1,598 | – |
| 95 | McHenry | 26,299 | – |
| 96 | Geneva | 23,815 | – |
| 97 | Malta | 1,174 | 2.7% |
| 98 | Albers | 1,035 | – |
| 99 | University Park | 8,073 | 2.6% |
| 100 | Deer Creek | 729 | 2.6% |
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