There are 58 cities in McHenry 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 | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Elgin | 1 | 112,874 | 114,617 | -0.39% | 2,959 | 38.1 | City |
| Palatine | 2 | 63,932 | 67,678 | -1.44% | 4,529 | 14.1 | Village |
| Hoffman Estates | 3 | 49,445 | 52,380 | -1.46% | 2,399 | 20.6 | Village |
| Crystal Lake | 4 | 41,071 | 40,229 | 0.51% | 2,163 | 19.0 | City |
| Algonquin | 5 | 30,286 | 29,676 | 0.5% | 2,415 | 12.5 | Village |
| Lake Hills | 6 | 28,572 | 28,927 | -0.31% | 2,800 | 10.2 | Village |
| McHenry | 7 | 28,554 | 27,340 | 1.07% | 1,926 | 14.8 | City |
| Huntley | 8 | 28,436 | 27,766 | 0.59% | 1,941 | 14.7 | Village |
| Woodstock | 9 | 25,730 | 25,605 | 0.12% | 1,951 | 13.2 | City |
| Lake Zurich | 10 | 19,649 | 19,755 | -0.14% | 2,838 | 6.9 | Village |
| Cary | 11 | 18,034 | 17,804 | 0.32% | 2,768 | 6.5 | Village |
| Wauconda | 12 | 13,832 | 14,067 | -0.43% | 2,727 | 5.1 | Village |
| Pingree Grove | 13 | 11,383 | 10,399 | 2.21% | 2,754 | 4.1 | Village |
| Fox Lake | 14 | 10,748 | 10,974 | -0.53% | 1,372 | 7.8 | Village |
| Barrington | 15 | 10,401 | 10,700 | -0.72% | 2,253 | 4.6 | Village |
| Harvard | 16 | 9,323 | 9,455 | -0.35% | 1,113 | 8.4 | City |
| Gilberts | 17 | 8,904 | 8,374 | 1.5% | 1,622 | 5.5 | Village |
| Hampshire | 18 | 8,232 | 7,646 | 1.81% | 856 | 9.6 | Village |
| Island Lake | 19 | 7,978 | 8,033 | -0.18% | 2,382 | 3.3 | Village |
| Marengo | 20 | 7,625 | 7,555 | 0.22% | 857 | 8.9 | City |
| Volo | 21 | 7,285 | 6,209 | 3.83% | 1,767 | 4.1 | Village |
| Inverness | 22 | 7,208 | 7,582 | -1.29% | 1,103 | 6.5 | Village |
| Johnsburg | 23 | 6,394 | 6,354 | 0.16% | 881 | 7.3 | Village |
| Lakemoor | 24 | 6,392 | 6,174 | 0.85% | 1,205 | 5.3 | Village |
| Spring Grove | 25 | 5,522 | 5,480 | 0.18% | 610 | 9.1 | Village |
| Genoa | 26 | 5,480 | 5,307 | 0.79% | 2,111 | 2.6 | City |
| Wonder Lake | 27 | 5,196 | 3,966 | 6.28% | 1,047 | 5.0 | Village |
| Lake Barrington | 28 | 5,093 | 5,089 | 0.02% | 888 | 5.7 | Village |
| South Barrington | 29 | 4,943 | 5,065 | -0.62% | 663 | 7.5 | Village |
| Fox River Grove | 30 | 4,596 | 4,686 | -0.5% | 2,685 | 1.7 | Village |
| Lakewood | 31 | 4,267 | 4,267 | 0% | 930 | 4.6 | Village |
| Barrington Hills | 32 | 3,992 | 4,095 | -0.65% | 148 | 27.0 | Village |
| Deer Park | 33 | 3,610 | 3,682 | -0.5% | 984 | 3.7 | Village |
| Pistakee Highlands | 34 | 3,265 | 3,302 | -0.4% | 2,543 | 1.3 | CDP |
| North Barrington | 35 | 3,095 | 3,135 | -0.32% | 655 | 4.7 | Village |
| East Dundee | 36 | 3,094 | 3,177 | -0.67% | 1,057 | 2.9 | Village |
| Richmond | 37 | 2,122 | 2,089 | 0.38% | 495 | 4.3 | Village |
| Oakwood Hills | 38 | 2,048 | 2,068 | -0.24% | 1,882 | 1.1 | Village |
| Prairie Grove | 39 | 1,942 | 1,960 | -0.26% | 336 | 5.8 | Village |
| Port Barrington | 40 | 1,561 | 1,584 | -0.38% | 1,346 | 1.2 | Village |
| Hebron | 41 | 1,388 | 1,383 | 0.07% | 709 | 2.0 | Village |
| Tower Lakes | 42 | 1,192 | 1,222 | -0.67% | 1,297 | 0.9 | Village |
| Bull Valley | 43 | 1,111 | 1,118 | -0.18% | 115 | 9.6 | Village |
| McCullom Lake | 44 | 963 | 982 | -0.52% | 2,775 | 0.3 | Village |
| Ringwood | 45 | 818 | 829 | -0.36% | 212 | 3.9 | Village |
| Union | 46 | 608 | 550 | 2.36% | 727 | 0.8 | Village |
| Holiday Hills | 47 | 604 | 616 | -0.49% | 647 | 0.9 | Village |
| Burlington | 48 | 519 | 535 | -0.77% | 76 | 6.9 | Village |
| Trout Valley | 49 | 507 | 514 | -0.39% | 1,185 | 0.4 | Village |
| Solon Mills | 50 | 471 | 177 | 7.53% | 2,415 | 0.2 | CDP |
| Ridgefield | 51 | 443 | 274 | 7.52% | 847 | 0.5 | CDP |
| Chemung | 52 | 399 | 738 | 1.79% | 1,420 | 0.3 | CDP |
| Garden Prairie | 53 | 383 | 265 | 7.89% | 600 | 0.6 | CDP |
| Greenwood | 54 | 314 | 317 | -0.32% | 118 | 2.7 | Village |
| Burtons Bridge | 55 | 246 | 273 | 7.42% | 2,000 | 0.1 | CDP |
| Lawrence | 56 | 234 | 150 | 7.34% | 636 | 0.4 | CDP |
| Alden | 57 | 196 | 167 | 7.69% | 1,556 | 0.1 | CDP |
| Hartland | 58 | 136 | 156 | 7.09% | 426 | 0.3 | CDP |
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.
Elgin is the largest city in McHenry County.
Hartland is the smallest city in McHenry County.
There are 58 cities in McHenry County, Illinois.