Last official estimated population of Rock Island County was 147,632 (year 2014)[1]. This was 0.046% of total US population and 1.1% of total Illinois state population. Area of Rock Island County is 451.3 mi² (=1168.8 km²), in this year population density was 327.13 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Rock Island County population in 2026 would be 147,890 [0].
Historical population of Rock Island 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] +10.27 %/yr
[1850-1860] +11.72 %/yr
[1860-1870] +3.55 %/yr
[1870-1880] +2.55 %/yr
[1880-1890] +0.91 %/yr
[1890-1900] +2.8 %/yr
[1900-1910] +2.45 %/yr
[1910-1920] +2.74 %/yr
[1920-1930] +0.62 %/yr
[1930-1940] +1.44 %/yr
[1940-1950] +1.66 %/yr
[1950-1960] +1.23 %/yr
[1960-1970] +1 %/yr
[1970-1980] -0.05 %/yr
[1980-1990] -1.09 %/yr
[1990-2000] +0.04 %/yr
[2000-2005] -0.31 %/yr
[2005-2010] +0.07 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Rock Island County? Visit this page: Settlements in Rock Island County, IL
Population of Rock Island County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4476 | 4414 | 8,890 |
| 5 to 9 | 4681 | 4481 | 9,162 |
| 10 to 14 | 4543 | 4258 | 8,801 |
| 15 to 19 | 4682 | 4453 | 9,135 |
| 20 to 24 | 4639 | 4729 | 9,368 |
| 25 to 29 | 4575 | 4425 | 9,000 |
| 30 to 34 | 4933 | 4523 | 9,456 |
| 35 to 39 | 4504 | 4196 | 8,700 |
| 40 to 44 | 4232 | 4215 | 8,447 |
| 45 to 49 | 4387 | 4353 | 8,740 |
| 50 to 54 | 5028 | 5156 | 10,184 |
| 55 to 59 | 5277 | 5518 | 10,795 |
| 60 to 64 | 4678 | 4956 | 9,634 |
| 65 to 69 | 3800 | 4251 | 8,051 |
| 70 to 74 | 2871 | 3096 | 5,967 |
| 75 to 79 | 1990 | 2496 | 4,486 |
| 80 to 84 | 1357 | 1999 | 3,356 |
| 85+ | 1259 | 2632 | 3,891 |
Rock Island 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 |
| NH | 62709 | 65190 | 127,899 |
| WAC | 62185 | 65124 | 127,309 |
| WA | 60361 | 63385 | 123,746 |
| NHWAC | 53752 | 56907 | 110,659 |
| NHWA | 52252 | 55464 | 107,716 |
| H | 9203 | 8961 | 18,164 |
| BAC | 8728 | 8119 | 16,847 |
| HWAC | 8433 | 8217 | 16,650 |
| HWA | 8109 | 7921 | 16,030 |
| NHBAC | 8125 | 7517 | 15,642 |
| BA | 7446 | 6874 | 14,320 |
| NHBA | 7049 | 6461 | 13,510 |
| AAC | 2077 | 1902 | 3,979 |
| TOM | 1937 | 1861 | 3,798 |
| NHAAC | 1962 | 1817 | 3,779 |
| AA | 1741 | 1570 | 3,311 |
| NHAA | 1667 | 1521 | 3,188 |
| NHTOM | 1587 | 1540 | 3,127 |
| IAC | 846 | 849 | 1,695 |
| HBAC | 603 | 602 | 1,205 |
| NHIAC | 443 | 479 | 922 |
| HBA | 397 | 413 | 810 |
| IA | 391 | 418 | 809 |
| HIAC | 403 | 370 | 773 |
| HTOM | 350 | 321 | 671 |
| HIA | 266 | 253 | 519 |
| NHIA | 125 | 165 | 290 |
| NAC | 105 | 106 | 211 |
| HAAC | 115 | 85 | 200 |
| NHNAC | 83 | 91 | 174 |
| HAA | 74 | 49 | 123 |
| NA | 36 | 43 | 79 |
| NHNA | 29 | 39 | 68 |
| HNAC | 22 | 15 | 37 |
| HNA | 7 | 4 | 11 |
• Scott County population
12.3 mi, 
347°
• Whiteside County
39.3 mi, 
60°
• Knox County
41.5 mi, 
153°
• Henry County
24.3 mi, 
109°
• Clinton County
29.8 mi, 
3°
• Muscatine County
28.3 mi, 
272°
• Cedar County
35.8 mi, 
305°
• Warren County
42.8 mi, 
183°
• Mercer County
20.2 mi, 
205°
• Louisa County
39.5 mi, 
244°
[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
*Jo Daviess; see note 8 Illinois Notes
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