| Rank | City | 2009 Population (Est.) | Growth Rate (Annual) |
|---|---|---|---|
| 1 | Pingree Grove | 3,866 | 46.0% |
| 2 | Gilberts | 5,908 | 21.0% |
| 3 | Volo | 779 | 17.9% |
| 4 | Huntley | 22,765 | 17.6% |
| 5 | Indian Creek | 594 | 15.0% |
| 6 | Sumner | 2,974 | 14.3% |
| 7 | Round Lake | 16,748 | 13.6% |
| 8 | Montgomery | 15,146 | 13.2% |
| 9 | Plainfield | 36,234 | 12.9% |
| 10 | Minooka | 10,409 | 12.3% |
| 11 | Yorkville | 16,328 | 12.0% |
| 12 | Timberlane | 606 | 11.6% |
| 13 | Davis Junction | 2,265 | 11.4% |
| 14 | Sugar Grove | 9,518 | 11.1% |
| 15 | Poplar Grove | 4,043 | 10.1% |
| 16 | Plano | 11,989 | 9.7% |
| 17 | Oswego | 28,950 | – |
| 18 | Manhattan | 7,094 | 9.6% |
| 19 | Round Lake Heights | 2,802 | 9.4% |
| 20 | Richmond | 2,299 | 8.9% |
| 21 | Lakemoor | 5,732 | 8.7% |
| 22 | Cortland | 4,133 | 8.6% |
| 23 | Prairie Grove | 1,972 | 8.4% |
| 24 | Shorewood | 15,447 | 8.4% |
| 25 | Valmeyer | 1,162 | 8.3% |
| 26 | Elburn | 5,259 | 8.0% |
| 27 | Hampshire | 5,524 | 8.0% |
| 28 | Ohlman | 144 | 8.0% |
| 29 | East Carondelet | 580 | 7.4% |
| 30 | Channahon | 13,831 | 7.2% |
| 31 | Romeoville | 37,984 | 7.0% |
| 32 | Diamond | 2,403 | 6.9% |
| 33 | Hainesville | 3,660 | – |
| 34 | Frankfort | 17,878 | 6.6% |
| 35 | Port Barrington | 1,424 | 6.4% |
| 36 | Monee | 4,998 | 6.4% |
| 37 | Maple Park | 1,278 | 6.3% |
| 38 | Lockport | 24,651 | – |
| 39 | Lakewood | 3,681 | 5.6% |
| 40 | Capron | 1,710 | 5.5% |
| 41 | Antioch | 13,736 | 5.4% |
| 42 | Maryville | 7,373 | 5.2% |
| 43 | Crest Hill | 20,372 | 5.1% |
| 44 | Kirkland | 1,699 | – |
| 45 | North Aurora | 15,768 | 4.7% |
| 46 | Spring Grove | 5,741 | 4.6% |
| 47 | Smithton | 3,417 | 4.6% |
| 48 | Beecher | 3,019 | 4.5% |
| 49 | Sycamore | 17,626 | 4.5% |
| 50 | Elwood | 2,338 | – |
| 51 | Spaulding | 817 | 4.3% |
| 52 | Germantown Hills | 3,210 | 4.3% |
| 53 | West Dundee | 7,909 | 4.3% |
| 54 | Lake Villa | 8,612 | 4.2% |
| 55 | Roscoe | 8,809 | 4.2% |
| 56 | Mettawa | 508 | 3.9% |
| 57 | St. Joseph | 4,027 | 3.8% |
| 58 | Joliet | 145,793 | – |
| 59 | Aviston | 1,704 | 3.8% |
| 60 | Hamel | 766 | 3.7% |
| 61 | Kaneville | 604 | 3.7% |
| 62 | Matteson | 17,217 | 3.5% |
| 63 | Wonder Lake | 3,801 | – |
| 64 | New Lenox | 24,124 | 3.5% |
| 65 | Sherman | 3,807 | 3.4% |
| 66 | Manteno | 8,568 | 3.4% |
| 67 | Bannockburn | 1,871 | – |
| 68 | Algonquin | 30,310 | – |
| 69 | Mokena | 19,175 | – |
| 70 | Newark | 1,149 | – |
| 71 | Hawthorn Woods | 7,956 | 3.3% |
| 72 | Shiloh | 11,253 | 3.3% |
| 73 | Beach Park | 13,089 | 3.2% |
| 74 | Lincolnshire | 7,884 | 3.2% |
| 75 | Grantfork | 332 | 3.2% |
| 76 | Braidwood | 6,702 | 3.1% |
| 77 | Mahomet | 6,367 | 3.0% |
| 78 | South Elgin | 20,963 | – |
| 79 | Somonauk | 1,824 | 3.0% |
| 80 | Byron | 3,830 | 2.9% |
| 81 | Lebanon | 4,472 | 2.9% |
| 82 | Essex | 694 | 2.9% |
| 83 | Wauconda | 12,134 | 2.9% |
| 84 | Kappa | 216 | 2.9% |
| 85 | Peotone | 4,278 | 2.9% |
| 86 | Cary | 19,531 | – |
| 87 | Belvidere | 26,413 | – |
| 88 | Bolingbrook | 70,723 | 2.7% |
| 89 | Metamora | 3,387 | – |
| 90 | Bourbonnais | 18,984 | – |
| 91 | O'Fallon | 27,515 | – |
| 92 | Lake in the Hills | 29,668 | – |
| 93 | Johnsburg | 6,713 | 2.7% |
| 94 | Savoy | 5,549 | 2.6% |
| 95 | Hebron | 1,398 | – |
| 96 | McHenry | 26,762 | – |
| 97 | Chatham | 10,632 | 2.6% |
| 98 | Waterman | 1,520 | 2.6% |
| 99 | Lisbon | 356 | 2.5% |
| 100 | Goodfield | 849 | 2.5% |
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