Last official estimated population of Lake County was 704,141 (year 2014)[1]. This was 0.221% of total US population and 5.5% of total Illinois state population. Area of Lake County is 1,368.4 mi² (=3544.1 km²), in this year population density was 514.58 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Lake County population in 2026 would be 706,182 [0].
Historical population of Lake 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] +18.37 %/yr
[1850-1860] +2.53 %/yr
[1860-1870] +1.42 %/yr
[1870-1880] +0.13 %/yr
[1880-1890] +1.3 %/yr
[1890-1900] +3.6 %/yr
[1900-1910] +4.78 %/yr
[1910-1920] +3.04 %/yr
[1920-1930] +3.46 %/yr
[1930-1940] +1.5 %/yr
[1940-1950] +3.99 %/yr
[1950-1960] +5.07 %/yr
[1960-1970] +2.68 %/yr
[1970-1980] +1.42 %/yr
[1980-1990] +1.61 %/yr
[1990-2000] +2.24 %/yr
[2000-2005] +1.2 %/yr
[2005-2010] +0.55 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Lake County? Visit this page: Settlements in Lake County, IL
Population of Lake County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 21212 | 20668 | 41,880 |
| 5 to 9 | 25361 | 24240 | 49,601 |
| 10 to 14 | 27841 | 26408 | 54,249 |
| 15 to 19 | 29820 | 26115 | 55,935 |
| 20 to 24 | 27121 | 22238 | 49,359 |
| 25 to 29 | 19506 | 17797 | 37,303 |
| 30 to 34 | 20029 | 20141 | 40,170 |
| 35 to 39 | 21157 | 22107 | 43,264 |
| 40 to 44 | 23695 | 24595 | 48,290 |
| 45 to 49 | 25484 | 26519 | 52,003 |
| 50 to 54 | 27652 | 28655 | 56,307 |
| 55 to 59 | 25124 | 25818 | 50,942 |
| 60 to 64 | 19530 | 20308 | 39,838 |
| 65 to 69 | 14403 | 15482 | 29,885 |
| 70 to 74 | 9541 | 10719 | 20,260 |
| 75 to 79 | 6184 | 7624 | 13,808 |
| 80 to 84 | 4125 | 6013 | 10,138 |
| 85+ | 4099 | 7855 | 11,954 |
Lake 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 | 297319 | 296285 | 593,604 |
| WA | 290859 | 289819 | 580,678 |
| NH | 275846 | 281407 | 557,253 |
| NHWAC | 226779 | 229764 | 456,543 |
| NHWA | 221731 | 224792 | 446,523 |
| H | 76038 | 71895 | 147,933 |
| HWAC | 70540 | 66521 | 137,061 |
| HWA | 69128 | 65027 | 134,155 |
| BAC | 28796 | 30025 | 58,821 |
| AAC | 27875 | 29291 | 57,166 |
| NHAAC | 26875 | 28303 | 55,178 |
| NHBAC | 26091 | 27202 | 53,293 |
| BA | 25899 | 26986 | 52,885 |
| AA | 24701 | 26231 | 50,932 |
| NHAA | 24092 | 25641 | 49,733 |
| NHBA | 23827 | 24863 | 48,690 |
| TOM | 6999 | 7039 | 14,038 |
| NHTOM | 5511 | 5458 | 10,969 |
| IAC | 4825 | 4725 | 9,550 |
| HIAC | 3247 | 3113 | 6,360 |
| IA | 3120 | 2912 | 6,032 |
| HBAC | 2705 | 2823 | 5,528 |
| HIA | 2581 | 2394 | 4,975 |
| HBA | 2072 | 2123 | 4,195 |
| NHIAC | 1578 | 1612 | 3,190 |
| HTOM | 1488 | 1581 | 3,069 |
| HAAC | 1000 | 988 | 1,988 |
| NAC | 685 | 660 | 1,345 |
| HAA | 609 | 590 | 1,199 |
| NHIA | 539 | 518 | 1,057 |
| NHNAC | 454 | 413 | 867 |
| NA | 306 | 315 | 621 |
| HNAC | 231 | 247 | 478 |
| HNA | 160 | 180 | 340 |
| NHNA | 146 | 135 | 281 |
• Cook County population
31.7 mi, 
199°
• Milwaukee County
47.8 mi, 
357°
• DuPage County
46.7 mi, 
225°
• Kane County
57.4 mi, 
242°
• McHenry County
51.9 mi, 
269°
• Racine County
29.6 mi, 
2°
• Kenosha County
17.5 mi, 1°
• Berrien County
51.3 mi, 
136°
• Allegan County
44.9 mi, 
65°
• Van Buren County
57.8 mi, 
93°
[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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