Last official estimated population of Sangamon County was 197,833 (year 2014)[1]. This was 0.062% of total US population and 1.5% of total Illinois state population. Area of Sangamon County is 877.0 mi² (=2271.5 km²), in this year population density was 225.57 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Sangamon County population in 2026 would be 198,941 [0].
Historical population of Sangamon 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] +1.28 %/yr
[1840-1850] +2.71 %/yr
[1850-1860] +5.32 %/yr
[1860-1870] +3.69 %/yr
[1870-1880] +1.33 %/yr
[1880-1890] +1.47 %/yr
[1890-1900] +1.58 %/yr
[1900-1910] +2.43 %/yr
[1910-1920] +0.97 %/yr
[1920-1930] +1.09 %/yr
[1930-1940] +0.54 %/yr
[1940-1950] +1.1 %/yr
[1950-1960] +1.09 %/yr
[1960-1970] +0.97 %/yr
[1970-1980] +0.88 %/yr
[1980-1990] +0.13 %/yr
[1990-2000] +0.58 %/yr
[2000-2005] +0.36 %/yr
[2005-2010] +0.52 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Sangamon County? Visit this page: Settlements in Sangamon County, IL
Population of Sangamon County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 6146 | 5818 | 11,964 |
| 5 to 9 | 6423 | 6312 | 12,735 |
| 10 to 14 | 6725 | 6481 | 13,206 |
| 15 to 19 | 6247 | 5965 | 12,212 |
| 20 to 24 | 6113 | 6357 | 12,470 |
| 25 to 29 | 6005 | 6396 | 12,401 |
| 30 to 34 | 6298 | 6794 | 13,092 |
| 35 to 39 | 5872 | 6124 | 11,996 |
| 40 to 44 | 5979 | 6315 | 12,294 |
| 45 to 49 | 6301 | 6593 | 12,894 |
| 50 to 54 | 7272 | 7706 | 14,978 |
| 55 to 59 | 6913 | 7668 | 14,581 |
| 60 to 64 | 6243 | 7005 | 13,248 |
| 65 to 69 | 4736 | 5616 | 10,352 |
| 70 to 74 | 3113 | 3855 | 6,968 |
| 75 to 79 | 2252 | 2986 | 5,238 |
| 80 to 84 | 1497 | 2365 | 3,862 |
| 85+ | 1368 | 3138 | 4,506 |
Sangamon 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 | 93323 | 101326 | 194,649 |
| WAC | 81748 | 88121 | 169,869 |
| NHWAC | 79859 | 86237 | 166,096 |
| WA | 79680 | 85924 | 165,604 |
| NHWA | 77915 | 84162 | 162,077 |
| BAC | 13114 | 14660 | 27,774 |
| NHBAC | 12839 | 14389 | 27,228 |
| BA | 11588 | 13016 | 24,604 |
| NHBA | 11394 | 12830 | 24,224 |
| AAC | 2219 | 2402 | 4,621 |
| TOM | 2201 | 2351 | 4,552 |
| NHAAC | 2185 | 2358 | 4,543 |
| H | 2180 | 2168 | 4,348 |
| NHTOM | 2070 | 2220 | 4,290 |
| HWAC | 1889 | 1884 | 3,773 |
| AA | 1764 | 1918 | 3,682 |
| NHAA | 1745 | 1892 | 3,637 |
| HWA | 1765 | 1762 | 3,527 |
| IAC | 653 | 725 | 1,378 |
| NHIAC | 538 | 620 | 1,158 |
| HBAC | 275 | 271 | 546 |
| IA | 238 | 254 | 492 |
| HBA | 194 | 186 | 380 |
| NHIA | 171 | 195 | 366 |
| HTOM | 131 | 131 | 262 |
| HIAC | 115 | 105 | 220 |
| NAC | 100 | 89 | 189 |
| NHNAC | 89 | 84 | 173 |
| HIA | 67 | 59 | 126 |
| HAAC | 34 | 44 | 78 |
| NA | 32 | 31 | 63 |
| NHNA | 28 | 27 | 55 |
| HAA | 19 | 26 | 45 |
| HNAC | 11 | 5 | 16 |
| HNA | 4 | 4 | 8 |
• Macon County population
37.9 mi, 
79°
• Macoupin County
36.8 mi, 
202°
• Morgan County
28.8 mi, 
264°
• Christian County
25.1 mi, 
125°
• Logan County
30.1 mi, 
31°
• Montgomery County
37.9 mi, 
164°
• Mason County
35.7 mi, 
338°
• Cass County
34.2 mi, 
295°
• Menard County
19.6 mi, 339°
• Scott County
44.2 mi, 259°
[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, Bond Illinois Notes
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