Last official estimated population of McHenry County was 309,114 (year 2014)[1]. This was 0.097% of total US population and 2.4% of total Illinois state population. Area of McHenry County is 610.9 mi² (=1582.2 km²), in this year population density was 506.02 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), McHenry County population in 2025 would be 310,090 [0].
Historical population of McHenry County for period 1840-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1840-1850] +19.24 %/yr
[1850-1860] +3.96 %/yr
[1860-1870] +0.73 %/yr
[1870-1880] +0.47 %/yr
[1880-1890] +0.47 %/yr
[1890-1900] +1.32 %/yr
[1900-1910] +0.89 %/yr
[1910-1920] +0.2 %/yr
[1920-1930] +0.56 %/yr
[1930-1940] +0.62 %/yr
[1940-1950] +3.1 %/yr
[1950-1960] +5.21 %/yr
[1960-1970] +2.85 %/yr
[1970-1980] +2.86 %/yr
[1980-1990] +2.17 %/yr
[1990-2000] +3.54 %/yr
[2000-2005] +2.55 %/yr
[2005-2010] +0.97 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in McHenry County? Visit this page: Settlements in McHenry County, IL
Population of McHenry County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 8857 | 8168 | 17,025 |
| 5 to 9 | 10646 | 10282 | 20,928 |
| 10 to 14 | 12213 | 11582 | 23,795 |
| 15 to 19 | 11822 | 11080 | 22,902 |
| 20 to 24 | 9640 | 9111 | 18,751 |
| 25 to 29 | 8046 | 7345 | 15,391 |
| 30 to 34 | 8959 | 8794 | 17,753 |
| 35 to 39 | 9303 | 9546 | 18,849 |
| 40 to 44 | 11009 | 11292 | 22,301 |
| 45 to 49 | 12397 | 12661 | 25,058 |
| 50 to 54 | 13214 | 13327 | 26,541 |
| 55 to 59 | 11553 | 11470 | 23,023 |
| 60 to 64 | 8756 | 8947 | 17,703 |
| 65 to 69 | 6421 | 7016 | 13,437 |
| 70 to 74 | 4566 | 5122 | 9,688 |
| 75 to 79 | 2744 | 3295 | 6,039 |
| 80 to 84 | 1677 | 2254 | 3,931 |
| 85+ | 1372 | 2796 | 4,168 |
McHenry County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| WAC | 145739 | 146541 | 292,280 |
| WA | 143666 | 144503 | 288,169 |
| NH | 133318 | 135848 | 269,166 |
| NHWAC | 126855 | 129162 | 256,017 |
| NHWA | 125165 | 127505 | 252,670 |
| H | 19877 | 18240 | 38,117 |
| HWAC | 18884 | 17379 | 36,263 |
| HWA | 18501 | 16998 | 35,499 |
| AAC | 5066 | 5521 | 10,587 |
| NHAAC | 4846 | 5346 | 10,192 |
| AA | 4127 | 4628 | 8,755 |
| NHAA | 3990 | 4534 | 8,524 |
| BAC | 3143 | 2839 | 5,982 |
| NHBAC | 2729 | 2433 | 5,162 |
| BA | 2382 | 2062 | 4,444 |
| TOM | 2192 | 2163 | 4,355 |
| NHBA | 2103 | 1797 | 3,900 |
| NHTOM | 1792 | 1755 | 3,547 |
| IAC | 1420 | 1313 | 2,733 |
| HIAC | 758 | 676 | 1,434 |
| IA | 744 | 657 | 1,401 |
| NHIAC | 662 | 637 | 1,299 |
| HIA | 529 | 445 | 974 |
| HBAC | 414 | 406 | 820 |
| HTOM | 400 | 408 | 808 |
| HBA | 279 | 265 | 544 |
| NHIA | 215 | 212 | 427 |
| HAAC | 220 | 175 | 395 |
| NAC | 157 | 158 | 315 |
| HAA | 137 | 94 | 231 |
| NHNAC | 107 | 111 | 218 |
| NA | 84 | 75 | 159 |
| NHNA | 53 | 45 | 98 |
| HNAC | 50 | 47 | 97 |
| HNA | 31 | 30 | 61 |
• DuPage County population
37.6 mi, 
150°
• Kane County
26.6 mi, 
177°
• Waukesha County
48.6 mi, 
8°
• Winnebago County
36.2 mi, 
271°
• Rock County
39.7 mi, 
306°
• DeKalb County
33.8 mi, 
208°
• Walworth County
24.2 mi, 
349°
• Jefferson County
50.4 mi, 
341°
• Boone County
19 mi, 268°
• Ogle County
48.5 mi, 
246°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Putnam Illinois Notes
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