Last official estimated population of Greene County was 13,877 (year 2014)[1]. This was 0.004% of total US population and 0.1% of total Illinois state population. Area of Greene County is 546.3 mi² (=1414.8 km²), in this year population density was 25.40 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Greene County population in 2025 would be 13,852 [0].
Historical population of Greene 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] +4.53 %/yr
[1840-1850] +0.39 %/yr
[1850-1860] +2.62 %/yr
[1860-1870] +2.34 %/yr
[1870-1880] +1.27 %/yr
[1880-1890] +0.33 %/yr
[1890-1900] -0.16 %/yr
[1900-1910] -0.45 %/yr
[1910-1920] +0.23 %/yr
[1920-1930] -1.13 %/yr
[1930-1940] -0.06 %/yr
[1940-1950] -0.73 %/yr
[1950-1960] -0.76 %/yr
[1960-1970] -0.26 %/yr
[1970-1980] -0.21 %/yr
[1980-1990] -0.84 %/yr
[1990-2000] -0.37 %/yr
[2000-2005] -0.53 %/yr
[2005-2010] -0.7 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Greene County? Visit this page: Settlements in Greene County, IL
Population of Greene County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 376 | 399 | 775 |
| 5 to 9 | 386 | 389 | 775 |
| 10 to 14 | 417 | 435 | 852 |
| 15 to 19 | 444 | 393 | 837 |
| 20 to 24 | 383 | 371 | 754 |
| 25 to 29 | 376 | 330 | 706 |
| 30 to 34 | 445 | 338 | 783 |
| 35 to 39 | 416 | 395 | 811 |
| 40 to 44 | 423 | 395 | 818 |
| 45 to 49 | 458 | 430 | 888 |
| 50 to 54 | 526 | 513 | 1,039 |
| 55 to 59 | 541 | 491 | 1,032 |
| 60 to 64 | 455 | 444 | 899 |
| 65 to 69 | 347 | 375 | 722 |
| 70 to 74 | 270 | 332 | 602 |
| 75 to 79 | 204 | 249 | 453 |
| 80 to 84 | 158 | 191 | 349 |
| 85+ | 131 | 208 | 339 |
Greene 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 | 6666 | 6627 | 13,293 |
| WAC | 6602 | 6631 | 13,233 |
| WA | 6550 | 6592 | 13,142 |
| NHWAC | 6516 | 6582 | 13,098 |
| NHWA | 6468 | 6544 | 13,012 |
| BAC | 154 | 39 | 193 |
| NHBAC | 152 | 39 | 191 |
| BA | 129 | 18 | 147 |
| NHBA | 129 | 18 | 147 |
| H | 90 | 51 | 141 |
| HWAC | 86 | 49 | 135 |
| HWA | 82 | 48 | 130 |
| TOM | 53 | 41 | 94 |
| NHTOM | 49 | 40 | 89 |
| IAC | 33 | 30 | 63 |
| NHIAC | 27 | 27 | 54 |
| AAC | 20 | 18 | 38 |
| NHAAC | 20 | 18 | 38 |
| IA | 15 | 15 | 30 |
| NHIA | 11 | 13 | 24 |
| AA | 8 | 11 | 19 |
| NHAA | 8 | 11 | 19 |
| HIAC | 6 | 3 | 9 |
| HIA | 4 | 2 | 6 |
| HTOM | 4 | 1 | 5 |
| NAC | 2 | 2 | 4 |
| NHNAC | 2 | 2 | 4 |
| HBAC | 2 | 0 | 2 |
| NA | 1 | 1 | 2 |
| NHNA | 1 | 1 | 2 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• St. Charles County population
42.6 mi, 
201°
• Lincoln County
36.9 mi, 
236°
• Macoupin County
25.4 mi, 
104°
• Morgan County
26.9 mi, 
21°
• Jersey County
19.1 mi, 
175°
• Pike County
41.9 mi, 
268°
• Pike County
32.6 mi, 
304°
• Cass County
43.1 mi, 
10°
• Scott County
20 mi, 
346°
• Calhoun County
19.9 mi, 
228°
[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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