There are 85 cities in Lake County, Illinois.
Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | State | 2024 Population | 2020 Census | Annual Change | Density (mi²) | Area (mi²) |
|---|---|---|---|---|---|---|---|
| Waukegan | 1 | Illinois | 87,149 | 89,119 | -0.56% | 3,599 | 24.22 |
| Arlington Heights | 2 | Illinois | 73,520 | 77,420 | -1.31% | 4,425 | 16.61 |
| Palatine | 3 | Illinois | 63,932 | 67,678 | -1.44% | 4,529 | 14.12 |
| Hoffman Estates | 4 | Illinois | 49,445 | 52,380 | -1.46% | 2,399 | 20.61 |
| Buffalo Grove | 5 | Illinois | 42,281 | 43,085 | -0.47% | 4,423 | 9.56 |
| Wheeling | 6 | Illinois | 37,238 | 39,185 | -1.29% | 4,294 | 8.67 |
| Northbrook | 7 | Illinois | 33,601 | 35,105 | -1.11% | 2,537 | 13.24 |
| Mundelein | 8 | Illinois | 31,875 | 31,533 | 0.27% | 3,280 | 9.72 |
| North Chicago | 9 | Illinois | 30,317 | 30,712 | -0.33% | 3,792 | 8 |
| Highland Park | 10 | Illinois | 30,311 | 30,155 | 0.13% | 2,478 | 12.23 |
| Algonquin | 11 | Illinois | 30,286 | 29,676 | 0.5% | 2,415 | 12.54 |
| Gurnee | 12 | Illinois | 30,039 | 30,654 | -0.51% | 2,223 | 13.51 |
| Lake Hills | 13 | Illinois | 28,572 | 28,927 | -0.31% | 2,800 | 10.21 |
| McHenry | 14 | Illinois | 28,554 | 27,340 | 1.07% | 1,926 | 14.83 |
| Round Lake Beach | 15 | Illinois | 26,642 | 27,204 | -0.53% | 5,282 | 5.04 |
| Vernon Hills | 16 | Illinois | 26,628 | 26,823 | -0.18% | 3,442 | 7.74 |
| Zion | 17 | Illinois | 24,066 | 24,626 | -0.58% | 2,423 | 9.93 |
| Rolling Meadows | 18 | Illinois | 23,071 | 24,101 | -1.11% | 4,108 | 5.62 |
| Grayslake | 19 | Illinois | 20,866 | 21,216 | -0.42% | 1,912 | 10.91 |
| Libertyville | 20 | Illinois | 20,256 | 20,558 | -0.37% | 2,300 | 8.81 |
| Lake Zurich | 21 | Illinois | 19,649 | 19,755 | -0.14% | 2,838 | 6.92 |
| Lake Forest | 22 | Illinois | 19,357 | 19,345 | 0.02% | 1,125 | 17.20 |
| Deerfield | 23 | Illinois | 18,794 | 19,154 | -0.48% | 3,393 | 5.54 |
| Round Lake | 24 | Illinois | 18,342 | 18,692 | -0.48% | 3,299 | 5.56 |
| Cary | 25 | Illinois | 18,034 | 17,804 | 0.32% | 2,768 | 6.52 |
| Prospect Heights | 26 | Illinois | 15,115 | 15,989 | -1.43% | 3,593 | 4.21 |
| Antioch | 27 | Illinois | 14,906 | 14,613 | 0.49% | 1,809 | 8.24 |
| Lindenhurst | 28 | Illinois | 14,327 | 14,374 | -0.08% | 3,165 | 4.53 |
| Beach Park | 29 | Illinois | 13,997 | 14,235 | -0.43% | 1,978 | 7.08 |
| Wauconda | 30 | Illinois | 13,832 | 14,067 | -0.43% | 2,727 | 5.07 |
| Gages Lake | 31 | Illinois | 11,801 | 9,939 | 3.98% | 3,965 | 2.98 |
| Fox Lake | 32 | Illinois | 10,748 | 10,974 | -0.53% | 1,372 | 7.83 |
| Barrington | 33 | Illinois | 10,401 | 10,700 | -0.72% | 2,253 | 4.62 |
| Hawthorn Woods | 34 | Illinois | 9,468 | 9,088 | 1.01% | 1,164 | 8.14 |
| Lake Villa | 35 | Illinois | 8,591 | 8,726 | -0.39% | 1,315 | 6.53 |
| Long Grove | 36 | Illinois | 8,233 | 8,352 | -0.36% | 665 | 12.39 |
| Island Lake | 37 | Illinois | 7,978 | 8,033 | -0.18% | 2,382 | 3.35 |
| Lincolnshire | 38 | Illinois | 7,901 | 7,945 | -0.14% | 1,732 | 4.56 |
| Park City | 39 | Illinois | 7,828 | 7,882 | -0.18% | 6,766 | 1.16 |
| Round Lake Park | 40 | Illinois | 7,744 | 7,664 | 0.26% | 3,752 | 2.06 |
| Volo | 41 | Illinois | 7,285 | 6,209 | 3.83% | 1,767 | 4.12 |
| Inverness | 42 | Illinois | 7,208 | 7,582 | -1.29% | 1,103 | 6.53 |
| Winthrop Harbor | 43 | Illinois | 6,562 | 6,688 | -0.48% | 1,415 | 4.64 |
| Johnsburg | 44 | Illinois | 6,394 | 6,354 | 0.16% | 881 | 7.25 |
| Lakemoor | 45 | Illinois | 6,392 | 6,174 | 0.85% | 1,205 | 5.30 |
| Spring Grove | 46 | Illinois | 5,522 | 5,480 | 0.18% | 610 | 9.05 |
| Lake Bluff | 47 | Illinois | 5,508 | 5,610 | -0.47% | 1,351 | 4.08 |
| Highwood | 48 | Illinois | 5,377 | 5,084 | 1.38% | 7,468 | 0.72 |
| Wonder Lake | 49 | Illinois | 5,196 | 3,966 | 6.28% | 1,047 | 4.96 |
| Grandwood Park | 50 | Illinois | 5,161 | 5,114 | -2.18% | 3,572 | 1.45 |
| Lake Barrington | 51 | Illinois | 5,093 | 5,089 | 0.02% | 888 | 5.74 |
| South Barrington | 52 | Illinois | 4,943 | 5,065 | -0.62% | 663 | 7.46 |
| Fox River Grove | 53 | Illinois | 4,596 | 4,686 | -0.5% | 2,685 | 1.71 |
| Kildeer | 54 | Illinois | 4,476 | 4,079 | 2.26% | 1,038 | 4.31 |
| Green Oaks | 55 | Illinois | 4,043 | 4,109 | -0.42% | 1,013 | 3.99 |
| Barrington Hills | 56 | Illinois | 3,992 | 4,095 | -0.65% | 148 | 26.99 |
| Riverwoods | 57 | Illinois | 3,719 | 3,789 | -0.48% | 937 | 3.97 |
| Deer Park | 58 | Illinois | 3,610 | 3,682 | -0.5% | 984 | 3.67 |
| Hainesville | 59 | Illinois | 3,472 | 3,540 | -0.49% | 1,880 | 1.85 |
| Wadsworth | 60 | Illinois | 3,443 | 3,506 | -0.46% | 350 | 9.84 |
| Pistakee Highlands | 61 | Illinois | 3,282 | 3,302 | -0.15% | 2,556 | 1.28 |
| North Barrington | 62 | Illinois | 3,095 | 3,135 | -0.32% | 655 | 4.72 |
| East Dundee | 63 | Illinois | 3,094 | 3,177 | -0.67% | 1,057 | 2.93 |
| Long Lake | 64 | Illinois | 2,935 | 3,065 | -0.07% | 2,487 | 1.18 |
| Venetian Village | 65 | Illinois | 2,835 | 2,561 | 2.02% | 1,598 | 1.77 |
| Round Lake Heights | 66 | Illinois | 2,561 | 2,616 | -0.54% | 4,454 | 0.57 |
| Fox Lake Hills | 67 | Illinois | 2,402 | 2,125 | 0.08% | 1,894 | 1.27 |
| Oakwood Hills | 68 | Illinois | 2,048 | 2,068 | -0.24% | 1,882 | 1.09 |
| Prairie Grove | 69 | Illinois | 1,942 | 1,960 | -0.26% | 336 | 5.78 |
| Knollwood | 70 | Illinois | 1,842 | 1,684 | 2.22% | 3,045 | 0.60 |
| Channel Lake | 71 | Illinois | 1,784 | 1,784 | 0% | 989 | 1.80 |
| Port Barrington | 72 | Illinois | 1,561 | 1,584 | -0.38% | 1,346 | 1.16 |
| Forest Lake | 73 | Illinois | 1,396 | 1,292 | 1.9% | 3,989 | 0.35 |
| Lake Catherine | 74 | Illinois | 1,333 | 1,289 | 0.83% | 1,466 | 0.91 |
| Tower Lakes | 75 | Illinois | 1,192 | 1,222 | -0.67% | 1,297 | 0.92 |
| Bull Valley | 76 | Illinois | 1,111 | 1,118 | -0.18% | 115 | 9.65 |
| Third Lake | 77 | Illinois | 1,092 | 1,112 | -0.46% | 1,857 | 0.59 |
| Bannockburn | 78 | Illinois | 1,002 | 1,012 | -0.3% | 494 | 2.03 |
| McCullom Lake | 79 | Illinois | 963 | 982 | -0.52% | 2,775 | 0.35 |
| Holiday Hills | 80 | Illinois | 604 | 616 | -0.49% | 647 | 0.93 |
| Mettawa | 81 | Illinois | 548 | 531 | 0.73% | 101 | 5.45 |
| Indian Creek | 82 | Illinois | 524 | 530 | -0.38% | 1,963 | 0.27 |
| Trout Valley | 83 | Illinois | 507 | 514 | -0.39% | 1,185 | 0.43 |
| Burtons Bridge | 84 | Illinois | 161 | 273 | -13.44% | 1,309 | 0.12 |
| Old Mill Creek | 85 | Illinois | 161 | 164 | -0.62% | 15 | 10.66 |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Waukegan is the largest city in Lake County.
Old Mill Creek is the smallest city in Lake County.
There are 85 cities in Lake County, Illinois.