Last official estimated population of LaSalle County was 113,866 (year 2014)[1]. This was 0.036% of total US population and 0.9% of total Illinois state population. Area of LaSalle County is 1,148.1 mi² (=2973.7 km²), in this year population density was 99.17 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), LaSalle County population in 2026 would be 113,692 [0].
Historical population of LaSalle 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] +6.66 %/yr
[1850-1860] +10.5 %/yr
[1860-1870] +2.32 %/yr
[1870-1880] +1.48 %/yr
[1880-1890] +1.39 %/yr
[1890-1900] +0.83 %/yr
[1900-1910] +0.27 %/yr
[1910-1920] +0.31 %/yr
[1920-1930] +0.5 %/yr
[1930-1940] +0.01 %/yr
[1940-1950] +0.28 %/yr
[1950-1960] +0.97 %/yr
[1960-1970] +0.05 %/yr
[1970-1980] +0.06 %/yr
[1980-1990] -0.47 %/yr
[1990-2000] +0.43 %/yr
[2000-2005] +0.17 %/yr
[2005-2010] +0.24 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in LaSalle County? Visit this page: Settlements in LaSalle County, IL
Population of LaSalle County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 3090 | 2864 | 5,954 |
| 5 to 9 | 3359 | 3279 | 6,638 |
| 10 to 14 | 3722 | 3627 | 7,349 |
| 15 to 19 | 3667 | 3442 | 7,109 |
| 20 to 24 | 3567 | 3189 | 6,756 |
| 25 to 29 | 3456 | 2925 | 6,381 |
| 30 to 34 | 3533 | 3255 | 6,788 |
| 35 to 39 | 3261 | 2949 | 6,210 |
| 40 to 44 | 3397 | 3229 | 6,626 |
| 45 to 49 | 3674 | 3610 | 7,284 |
| 50 to 54 | 4427 | 4291 | 8,718 |
| 55 to 59 | 4323 | 4224 | 8,547 |
| 60 to 64 | 3765 | 3590 | 7,355 |
| 65 to 69 | 2766 | 2915 | 5,681 |
| 70 to 74 | 2075 | 2448 | 4,523 |
| 75 to 79 | 1563 | 1908 | 3,471 |
| 80 to 84 | 1118 | 1556 | 2,674 |
| 85+ | 1076 | 2101 | 3,177 |
LaSalle 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 | 53393 | 53799 | 107,192 |
| WA | 52721 | 53147 | 105,868 |
| NH | 50614 | 50773 | 101,387 |
| NHWAC | 48416 | 49368 | 97,784 |
| NHWA | 47867 | 48816 | 96,683 |
| H | 5225 | 4629 | 9,854 |
| HWAC | 4977 | 4431 | 9,408 |
| HWA | 4854 | 4331 | 9,185 |
| BAC | 2191 | 1125 | 3,316 |
| NHBAC | 2015 | 977 | 2,992 |
| BA | 1835 | 771 | 2,606 |
| NHBA | 1718 | 669 | 2,387 |
| TOM | 711 | 679 | 1,390 |
| AAC | 527 | 753 | 1,280 |
| NHAAC | 494 | 731 | 1,225 |
| NHTOM | 582 | 574 | 1,156 |
| AA | 368 | 609 | 977 |
| NHAA | 351 | 600 | 951 |
| IAC | 424 | 389 | 813 |
| NHIAC | 256 | 258 | 514 |
| IA | 193 | 180 | 373 |
| HBAC | 176 | 148 | 324 |
| HIAC | 168 | 131 | 299 |
| HTOM | 129 | 105 | 234 |
| HBA | 117 | 102 | 219 |
| NHIA | 92 | 105 | 197 |
| HIA | 101 | 75 | 176 |
| NAC | 35 | 31 | 66 |
| HAAC | 33 | 22 | 55 |
| NHNAC | 26 | 24 | 50 |
| NA | 11 | 16 | 27 |
| HAA | 17 | 9 | 26 |
| HNAC | 9 | 7 | 16 |
| HNA | 7 | 7 | 14 |
| NHNA | 4 | 9 | 13 |
• Kane County population
47.5 mi, 
29°
• Kendall County
29 mi, 
54°
• DeKalb County
38.6 mi, 
9°
• Grundy County
25.4 mi, 
97°
• Livingston County
35.5 mi, 
150°
• Woodford County
41.8 mi, 
203°
• Lee County
35.2 mi, 
322°
• Bureau County
33.5 mi, 
276°
• Marshall County
32.1 mi, 
227°
• Putnam County
23.6 mi, 
245°
[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
See note 5. Illinois Notes
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