Last official estimated population of Cass County was 13,639 (year 2014)[1]. This was 0.004% of total US population and 0.1% of total Illinois state population. Area of Cass County is 383.8 mi² (=993.9 km²), in this year population density was 35.54 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Cass County population in 2024 would be 13,632 [0].
Historical population of Cass 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] +9.3 %/yr
[1850-1860] +4.56 %/yr
[1860-1870] +0.22 %/yr
[1870-1880] +2.27 %/yr
[1880-1890] +0.97 %/yr
[1890-1900] +0.76 %/yr
[1900-1910] +0.09 %/yr
[1910-1920] +0.3 %/yr
[1920-1930] -0.79 %/yr
[1930-1940] -0.07 %/yr
[1940-1950] -0.84 %/yr
[1950-1960] -0.38 %/yr
[1960-1970] -0.22 %/yr
[1970-1980] +0.59 %/yr
[1980-1990] -1.15 %/yr
[1990-2000] +0.19 %/yr
[2000-2005] -0.03 %/yr
[2005-2010] -0.04 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Cass County? Visit this page: Settlements in Cass County, IL
Population of Cass County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 466 | 379 | 845 |
| 5 to 9 | 482 | 460 | 942 |
| 10 to 14 | 468 | 425 | 893 |
| 15 to 19 | 451 | 408 | 859 |
| 20 to 24 | 392 | 364 | 756 |
| 25 to 29 | 417 | 326 | 743 |
| 30 to 34 | 461 | 379 | 840 |
| 35 to 39 | 377 | 392 | 769 |
| 40 to 44 | 438 | 387 | 825 |
| 45 to 49 | 438 | 442 | 880 |
| 50 to 54 | 503 | 453 | 956 |
| 55 to 59 | 454 | 466 | 920 |
| 60 to 64 | 397 | 374 | 771 |
| 65 to 69 | 296 | 328 | 624 |
| 70 to 74 | 237 | 260 | 497 |
| 75 to 79 | 179 | 237 | 416 |
| 80 to 84 | 123 | 179 | 302 |
| 85+ | 97 | 221 | 318 |
Cass 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 | 6254 | 6193 | 12,447 |
| WA | 6182 | 6115 | 12,297 |
| NH | 5264 | 5406 | 10,670 |
| NHWAC | 4986 | 5184 | 10,170 |
| NHWA | 4939 | 5129 | 10,068 |
| H | 1412 | 1074 | 2,486 |
| HWAC | 1268 | 1009 | 2,277 |
| HWA | 1243 | 986 | 2,229 |
| BAC | 352 | 244 | 596 |
| BA | 309 | 196 | 505 |
| NHBAC | 257 | 194 | 451 |
| NHBA | 229 | 160 | 389 |
| TOM | 75 | 87 | 162 |
| IAC | 104 | 56 | 160 |
| HBAC | 95 | 50 | 145 |
| HBA | 80 | 36 | 116 |
| NHTOM | 48 | 63 | 111 |
| IA | 80 | 28 | 108 |
| HIAC | 67 | 30 | 97 |
| AAC | 34 | 62 | 96 |
| NHAAC | 27 | 55 | 82 |
| HIA | 57 | 21 | 78 |
| AA | 25 | 49 | 74 |
| NHAA | 21 | 44 | 65 |
| NHIAC | 37 | 26 | 63 |
| HTOM | 27 | 24 | 51 |
| NHIA | 23 | 7 | 30 |
| NAC | 8 | 12 | 20 |
| NHNAC | 6 | 10 | 16 |
| HAAC | 7 | 7 | 14 |
| NA | 5 | 5 | 10 |
| HAA | 4 | 5 | 9 |
| NHNA | 4 | 3 | 7 |
| HNAC | 2 | 2 | 4 |
| HNA | 1 | 2 | 3 |
• Sangamon County population
34.2 mi, 
115°
• Fulton County
34.3 mi, 
3°
• Morgan County
17.5 mi, 
172°
• McDonough County
40.7 mi, 
325°
• Pike County
41.6 mi, 
235°
• Mason County
25.5 mi, 
43°
• Menard County
24.2 mi, 
81°
• Schuyler County
23.4 mi, 
303°
• Brown County
26.7 mi, 
268°
• Scott County
26 mi, 
208°
[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
*Morgan Illinois Notes
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