Here are the 2010 population figures for municipalities at least part of which are in McHenry County along with their 2000 populations

• Algonquin – 30,046 vs. 23,276
• Barrington Hills – 4,209 vs. 3,930
• Bull Valley – 1,077 vs. 726
• Cary – 18,271 vs. 15,531
• Crystal Lake – 40,743 vs. 38,000
• Fox Lake – 10,579 vs. 9,178
• Fox River Grove – 4,854 vs. 4,862
• Greenwood – 255 vs. 244
• Harvard – 9,447 vs. 7,996
• Hebron – 1,216 vs. 1,038
• Holiday Hills – 610 vs. 831
• Huntley – 24,291 vs. 5,730
• Island Lake – 8,080 vs. 8,459
• Johnsburg – 6,337 vs. 5,391
• Lake in the Hills – 28,965 vs. 23,152
• Lakemoor – 6,017 vs. 1,802
• Marengo – 7,648 vs. 2,337
• McCullom Lake – 1,049 vs. 1,038
• McHenry – 26,992 vs. 21,501
• Oakwood Hills – 2083 vs. 1,498
• Port Barrington – 1,517 vs. 788
• Prairie Grove – 1,904 vs. 960
• Richmond – 1,874 vs. 1,091
• Ringwood – 836 vs. 1,091
• Spring Grove – 5,778 vs. 3,880
• Trout Valley – 537 vs. 599
• Union – 580 vs. 576
• Wonder Lake – 4,026 vs. 1,345
• Woodstock – 24,770 vs. 20,151