Last official estimated population of Mason County was 14,645 (year 2014)[1]. This was 0.005% of total US population and 0.1% of total Illinois state population. Area of Mason County is 563.5 mi² (=1459.4 km²), in this year population density was 25.99 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Mason County population in 2026 would be 14,582 [0].
Historical population of Mason County for period 1850-2014 [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
[1850-1860] +6.32 %/yr
[1860-1870] +4 %/yr
[1870-1880] +0.04 %/yr
[1880-1890] -0.11 %/yr
[1890-1900] +0.85 %/yr
[1900-1910] -0.07 %/yr
[1910-1920] -0.44 %/yr
[1920-1930] -0.95 %/yr
[1930-1940] +0.16 %/yr
[1940-1950] -0.02 %/yr
[1950-1960] -0.09 %/yr
[1960-1970] +0.62 %/yr
[1970-1980] +1.89 %/yr
[1980-1990] -1.79 %/yr
[1990-2000] -0.15 %/yr
[2000-2005] -0.71 %/yr
[2005-2010] -1.06 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Mason County? Visit this page: Settlements in Mason County, IL
Population of Mason County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 368 | 305 | 673 |
| 5 to 9 | 380 | 390 | 770 |
| 10 to 14 | 435 | 457 | 892 |
| 15 to 19 | 480 | 442 | 922 |
| 20 to 24 | 404 | 355 | 759 |
| 25 to 29 | 339 | 328 | 667 |
| 30 to 34 | 382 | 397 | 779 |
| 35 to 39 | 391 | 377 | 768 |
| 40 to 44 | 424 | 419 | 843 |
| 45 to 49 | 472 | 458 | 930 |
| 50 to 54 | 523 | 559 | 1,082 |
| 55 to 59 | 530 | 523 | 1,053 |
| 60 to 64 | 526 | 480 | 1,006 |
| 65 to 69 | 404 | 441 | 845 |
| 70 to 74 | 310 | 313 | 623 |
| 75 to 79 | 228 | 256 | 484 |
| 80 to 84 | 151 | 220 | 371 |
| 85+ | 142 | 289 | 431 |
Mason 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 | 6801 | 6951 | 13,752 |
| WAC | 6795 | 6923 | 13,718 |
| NHWAC | 6715 | 6869 | 13,584 |
| WA | 6706 | 6857 | 13,563 |
| NHWA | 6627 | 6803 | 13,430 |
| TOM | 92 | 71 | 163 |
| NHTOM | 91 | 69 | 160 |
| BAC | 98 | 53 | 151 |
| NHBAC | 98 | 50 | 148 |
| H | 88 | 58 | 146 |
| HWAC | 80 | 54 | 134 |
| HWA | 79 | 54 | 133 |
| IAC | 50 | 60 | 110 |
| NHIAC | 43 | 57 | 100 |
| AAC | 39 | 44 | 83 |
| NHAAC | 37 | 44 | 81 |
| BA | 52 | 21 | 73 |
| NHBA | 52 | 20 | 72 |
| AA | 20 | 31 | 51 |
| NHAA | 19 | 31 | 50 |
| IA | 18 | 29 | 47 |
| NHIA | 12 | 28 | 40 |
| HIAC | 7 | 3 | 10 |
| HIA | 6 | 1 | 7 |
| NAC | 3 | 0 | 3 |
| HTOM | 1 | 2 | 3 |
| HBAC | 0 | 3 | 3 |
| NHNAC | 2 | 0 | 2 |
| HAAC | 2 | 0 | 2 |
| HNAC | 1 | 0 | 1 |
| NA | 1 | 0 | 1 |
| HAA | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
| HBA | 0 | 1 | 1 |
| NHNA | 0 | 0 | 0 |
• Sangamon County population
35.7 mi, 
158°
• Peoria County
38.7 mi, 
11°
• Tazewell County
28.1 mi, 
48°
• Fulton County
21.9 mi, 
316°
• Morgan County
39 mi, 
203°
• McDonough County
43 mi, 
290°
• Logan County
29.9 mi, 
104°
• Cass County
25.5 mi, 
223°
• Menard County
16.1 mi, 156°
• Schuyler County
37.3 mi, 
261°
[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
*Tazewell, Menard Illinois Notes
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