The population of McHenry County on July 1, 2023 was 312,800, an increase of 0.8% since 2020.
| Algonquin | Small line chart with 2 values, ranging from 29707 to 30134. | 427 | 1.4% |
|---|---|---|---|
| Barrington Hills | Small line chart with 2 values, ranging from 4106 to 4018. | −88 | −2.1% |
| Bull Valley | Small line chart with 2 values, ranging from 1121 to 1113. | −8 | −0.7% |
| Cary | Small line chart with 2 values, ranging from 17828 to 17977. | 149 | 0.8% |
| Crystal Lake | Small line chart with 2 values, ranging from 40254 to 40861. | 607 | 1.5% |
| Fox Lake | Small line chart with 2 values, ranging from 10987 to 10805. | −182 | −1.7% |
| Fox River Grove | Small line chart with 2 values, ranging from 4698 to 4619. | −79 | −1.7% |
| Greenwood | Small line chart with 2 values, ranging from 318 to 315. | −3 | −0.9% |
| Harvard | Small line chart with 2 values, ranging from 9473 to 9356. | −117 | −1.2% |
| Hebron | Small line chart with 2 values, ranging from 1383 to 1387. | 4 | 0.3% |
| Holiday Hills | Small line chart with 2 values, ranging from 617 to 607. | −10 | −1.6% |
| Huntley | Small line chart with 2 values, ranging from 27745 to 28269. | 524 | 1.9% |
| Island Lake | Small line chart with 2 values, ranging from 8048 to 7992. | −56 | −0.7% |
| Johnsburg | Small line chart with 2 values, ranging from 6364 to 6384. | 20 | 0.3% |
| Lake in the Hills | Small line chart with 2 values, ranging from 28986 to 28661. | −325 | −1.1% |
| Lakemoor | Small line chart with 2 values, ranging from 6186 to 6338. | 152 | 2.5% |
| Lakewood | Small line chart with 2 values, ranging from 4275 to 4267. | −8 | −0.2% |
| Marengo | Small line chart with 2 values, ranging from 7567 to 7608. | 41 | 0.5% |
| McCullom Lake | Small line chart with 2 values, ranging from 984 to 968. | −16 | −1.6% |
| McHenry | Small line chart with 2 values, ranging from 27316 to 28251. | 935 | 3.4% |
| Oakwood Hills | Small line chart with 2 values, ranging from 2072 to 2053. | −19 | −0.9% |
| Port Barrington | Small line chart with 2 values, ranging from 1587 to 1567. | −20 | −1.3% |
| Prairie Grove | Small line chart with 2 values, ranging from 1964 to 1947. | −17 | −0.9% |
| Richmond | Small line chart with 2 values, ranging from 2089 to 2114. | 25 | 1.2% |
| Ringwood | Small line chart with 2 values, ranging from 831 to 821. | −10 | −1.2% |
| Spring Grove | Small line chart with 2 values, ranging from 5485 to 5512. | 27 | 0.5% |
| Trout Valley | Small line chart with 2 values, ranging from 515 to 509. | −6 | −1.2% |
| Union | Small line chart with 2 values, ranging from 551 to 594. | 43 | 7.8% |
| Wonder Lake | Small line chart with 2 values, ranging from 3973 to 4889. | 916 | 23.1% |
| Woodstock | Small line chart with 2 values, ranging from 25629 to 25699. | 70 | 0.3% |