Last official estimated population of Adams County was 67,162 (year 2014)[1]. This was 0.021% of total US population and 0.5% of total Illinois state population. Area of Adams County is 871.3 mi² (=2256.8 km²), in this year population density was 77.08 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Adams County population in 2026 would be 67,339 [0].
Historical population of Adams County for period 1830-2014 [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
[1830-1840] +20.81 %/yr
[1840-1850] +6.24 %/yr
[1850-1860] +4.54 %/yr
[1860-1870] +3.15 %/yr
[1870-1880] +0.48 %/yr
[1880-1890] +0.46 %/yr
[1890-1900] +0.81 %/yr
[1900-1910] -0.37 %/yr
[1910-1920] -0.38 %/yr
[1920-1930] +0.1 %/yr
[1930-1940] +0.38 %/yr
[1940-1950] -0.08 %/yr
[1950-1960] +0.57 %/yr
[1960-1970] +0.34 %/yr
[1970-1980] +0.11 %/yr
[1980-1990] -0.8 %/yr
[1990-2000] +0.32 %/yr
[2000-2005] -0.4 %/yr
[2005-2010] +0.05 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Adams County? Visit this page: Settlements in Adams County, IL
Population of Adams County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2153 | 1993 | 4,146 |
| 5 to 9 | 2170 | 2078 | 4,248 |
| 10 to 14 | 2145 | 2025 | 4,170 |
| 15 to 19 | 2115 | 1982 | 4,097 |
| 20 to 24 | 2114 | 2158 | 4,272 |
| 25 to 29 | 1982 | 2003 | 3,985 |
| 30 to 34 | 2034 | 2096 | 4,130 |
| 35 to 39 | 1844 | 1784 | 3,628 |
| 40 to 44 | 1868 | 1876 | 3,744 |
| 45 to 49 | 2027 | 2070 | 4,097 |
| 50 to 54 | 2451 | 2486 | 4,937 |
| 55 to 59 | 2374 | 2401 | 4,775 |
| 60 to 64 | 2063 | 2158 | 4,221 |
| 65 to 69 | 1684 | 1913 | 3,597 |
| 70 to 74 | 1278 | 1532 | 2,810 |
| 75 to 79 | 951 | 1221 | 2,172 |
| 80 to 84 | 767 | 1059 | 1,826 |
| 85+ | 723 | 1410 | 2,133 |
Adams 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 | 32240 | 33778 | 66,018 |
| WAC | 31100 | 32698 | 63,798 |
| NHWAC | 30654 | 32282 | 62,936 |
| WA | 30517 | 32183 | 62,700 |
| NHWA | 30099 | 31798 | 61,897 |
| BAC | 1737 | 1572 | 3,309 |
| NHBAC | 1689 | 1519 | 3,208 |
| BA | 1307 | 1172 | 2,479 |
| NHBA | 1277 | 1139 | 2,416 |
| TOM | 603 | 545 | 1,148 |
| NHTOM | 573 | 511 | 1,084 |
| H | 503 | 467 | 970 |
| HWAC | 446 | 416 | 862 |
| HWA | 418 | 385 | 803 |
| AAC | 323 | 359 | 682 |
| NHAAC | 307 | 350 | 657 |
| AA | 237 | 270 | 507 |
| NHAA | 224 | 265 | 489 |
| IAC | 180 | 166 | 346 |
| NHIAC | 156 | 144 | 300 |
| IA | 73 | 68 | 141 |
| NHIA | 61 | 58 | 119 |
| HBAC | 48 | 53 | 101 |
| HTOM | 30 | 34 | 64 |
| HBA | 30 | 33 | 63 |
| HIAC | 24 | 22 | 46 |
| NAC | 22 | 21 | 43 |
| NHNAC | 21 | 20 | 41 |
| HAAC | 16 | 9 | 25 |
| HIA | 12 | 10 | 22 |
| HAA | 13 | 5 | 18 |
| NA | 6 | 7 | 13 |
| NHNA | 6 | 7 | 13 |
| HNAC | 1 | 1 | 2 |
| HNA | 0 | 0 | 0 |
• McDonough County population
42.4 mi, 
39°
• Marion County
26.4 mi, 
242°
• Hancock County
29 mi, 
2°
• Pike County
44.7 mi, 
178°
• Pike County
29.8 mi, 
146°
• Lewis County
29 mi, 
283°
• Ralls County
34.6 mi, 
210°
• Schuyler County
32.9 mi, 
68°
• Clark County
40.5 mi, 
315°
• Brown County
23.6 mi, 
94°
[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
*Madison Illinois Notes
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