Last official estimated population of Franklin County was 40,023 (year 2014)[1]. This was 0.013% of total US population and 0.3% of total Illinois state population. Area of Franklin County is 431.4 mi² (=1117.4 km²), in this year population density was 92.77 p/mi². If population growth rate would be same as in period 2010-2014 (+0.29%/yr), Franklin County population in 2026 would be 41,442 [0].
Historical population of Franklin County for period 1820-2014 [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
[1820-1830] +8.76 %/yr
[1830-1840] -1.03 %/yr
[1840-1850] +4.43 %/yr
[1850-1860] +5.16 %/yr
[1860-1870] +3.02 %/yr
[1870-1880] +2.46 %/yr
[1880-1890] +0.61 %/yr
[1890-1900] +1.39 %/yr
[1900-1910] +2.8 %/yr
[1910-1920] +8.25 %/yr
[1920-1930] +0.37 %/yr
[1930-1940] -1.12 %/yr
[1940-1950] -0.87 %/yr
[1950-1960] -2.12 %/yr
[1960-1970] -0.25 %/yr
[1970-1980] +1.2 %/yr
[1980-1990] -0.69 %/yr
[1990-2000] -0.33 %/yr
[2000-2005] +0.29 %/yr
[2005-2010] -0.01 %/yr
[2010-2014] +0.29 %/yr
Looking for settlements in Franklin County? Visit this page: Settlements in Franklin County, IL
Population of Franklin County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1195 | 1097 | 2,292 |
| 5 to 9 | 1239 | 1106 | 2,345 |
| 10 to 14 | 1288 | 1249 | 2,537 |
| 15 to 19 | 1209 | 1133 | 2,342 |
| 20 to 24 | 1158 | 1086 | 2,244 |
| 25 to 29 | 1095 | 1088 | 2,183 |
| 30 to 34 | 1070 | 1141 | 2,211 |
| 35 to 39 | 1130 | 1185 | 2,315 |
| 40 to 44 | 1262 | 1222 | 2,484 |
| 45 to 49 | 1292 | 1253 | 2,545 |
| 50 to 54 | 1379 | 1432 | 2,811 |
| 55 to 59 | 1411 | 1413 | 2,824 |
| 60 to 64 | 1256 | 1350 | 2,606 |
| 65 to 69 | 1126 | 1241 | 2,367 |
| 70 to 74 | 907 | 1070 | 1,977 |
| 75 to 79 | 672 | 768 | 1,440 |
| 80 to 84 | 387 | 557 | 944 |
| 85+ | 282 | 662 | 944 |
Franklin 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 | 19094 | 19761 | 38,855 |
| NH | 19059 | 19739 | 38,798 |
| WA | 18867 | 19539 | 38,406 |
| NHWAC | 18820 | 19481 | 38,301 |
| NHWA | 18609 | 19271 | 37,880 |
| H | 299 | 314 | 613 |
| HWAC | 274 | 280 | 554 |
| HWA | 258 | 268 | 526 |
| TOM | 236 | 234 | 470 |
| NHTOM | 220 | 222 | 442 |
| BAC | 229 | 197 | 426 |
| NHBAC | 215 | 179 | 394 |
| IAC | 158 | 185 | 343 |
| NHIAC | 135 | 159 | 294 |
| AAC | 118 | 139 | 257 |
| NHAAC | 113 | 137 | 250 |
| BA | 126 | 90 | 216 |
| NHBA | 119 | 80 | 199 |
| AA | 73 | 101 | 174 |
| NHAA | 69 | 99 | 168 |
| IA | 55 | 86 | 141 |
| NHIA | 41 | 64 | 105 |
| HIAC | 23 | 26 | 49 |
| HIA | 14 | 22 | 36 |
| HBAC | 14 | 18 | 32 |
| HTOM | 16 | 12 | 28 |
| HBA | 7 | 10 | 17 |
| NAC | 4 | 7 | 11 |
| NHNAC | 4 | 7 | 11 |
| HAAC | 5 | 2 | 7 |
| HAA | 4 | 2 | 6 |
| NA | 1 | 3 | 4 |
| NHNA | 1 | 3 | 4 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Williamson County population
18.1 mi, 
180°
• Jackson County
28.6 mi, 
240°
• Jefferson County
21.3 mi, 
0°
• Saline County
26.6 mi, 
128°
• Perry County
24.9 mi, 
284°
• Union County
39.1 mi, 
206°
• Wayne County
40.5 mi, 
41°
• Washington County
36.5 mi, 
313°
• Johnson County
36.8 mi, 176°
• Hamilton County
22 mi, 
72°
[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
*Randolph Illinois Notes
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