Last official estimated population of Massac County was 15,400 (year 2014)[1]. This was 0.005% of total US population and 0.1% of total Illinois state population. Area of Massac County is 241.8 mi² (=626.3 km²), in this year population density was 63.69 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Massac County population in 2026 would be 15,313 [0].
Historical population of Massac 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] +4.26 %/yr
[1860-1870] +4.43 %/yr
[1870-1880] +0.87 %/yr
[1880-1890] +0.8 %/yr
[1890-1900] +1.49 %/yr
[1900-1910] +0.8 %/yr
[1910-1920] -0.46 %/yr
[1920-1930] +0.38 %/yr
[1930-1940] +0.59 %/yr
[1940-1950] -0.94 %/yr
[1950-1960] +0.54 %/yr
[1960-1970] -0.32 %/yr
[1970-1980] +0.77 %/yr
[1980-1990] -0.16 %/yr
[1990-2000] +0.28 %/yr
[2000-2005] +0.41 %/yr
[2005-2010] -0.06 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Massac County? Visit this page: Settlements in Massac County, IL
Population of Massac County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 439 | 423 | 862 |
| 5 to 9 | 439 | 491 | 930 |
| 10 to 14 | 462 | 477 | 939 |
| 15 to 19 | 410 | 397 | 807 |
| 20 to 24 | 402 | 395 | 797 |
| 25 to 29 | 336 | 394 | 730 |
| 30 to 34 | 398 | 479 | 877 |
| 35 to 39 | 402 | 431 | 833 |
| 40 to 44 | 464 | 475 | 939 |
| 45 to 49 | 485 | 458 | 943 |
| 50 to 54 | 547 | 585 | 1,132 |
| 55 to 59 | 533 | 615 | 1,148 |
| 60 to 64 | 467 | 470 | 937 |
| 65 to 69 | 422 | 447 | 869 |
| 70 to 74 | 329 | 400 | 729 |
| 75 to 79 | 256 | 295 | 551 |
| 80 to 84 | 134 | 245 | 379 |
| 85+ | 163 | 340 | 503 |
Massac 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 | 6868 | 7643 | 14,511 |
| WAC | 6612 | 7292 | 13,904 |
| WA | 6476 | 7127 | 13,603 |
| NHWAC | 6414 | 7136 | 13,550 |
| NHWA | 6282 | 6977 | 13,259 |
| BAC | 510 | 565 | 1,075 |
| NHBAC | 495 | 548 | 1,043 |
| BA | 420 | 449 | 869 |
| NHBA | 406 | 435 | 841 |
| H | 220 | 174 | 394 |
| HWAC | 198 | 156 | 354 |
| HWA | 194 | 150 | 344 |
| TOM | 140 | 171 | 311 |
| NHTOM | 136 | 165 | 301 |
| IAC | 57 | 76 | 133 |
| NHIAC | 50 | 71 | 121 |
| AAC | 46 | 54 | 100 |
| NHAAC | 43 | 51 | 94 |
| AA | 25 | 35 | 60 |
| IA | 25 | 35 | 60 |
| NHAA | 23 | 33 | 56 |
| NHIA | 20 | 33 | 53 |
| HBAC | 15 | 17 | 32 |
| HBA | 14 | 14 | 28 |
| HIAC | 7 | 5 | 12 |
| HTOM | 4 | 6 | 10 |
| NAC | 6 | 3 | 9 |
| NHNAC | 5 | 3 | 8 |
| HIA | 5 | 2 | 7 |
| HAAC | 3 | 3 | 6 |
| HAA | 2 | 2 | 4 |
| NA | 2 | 0 | 2 |
| HNAC | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
| NHNA | 1 | 0 | 1 |
• McCracken County population
11.2 mi,
181°
• Graves County
34.2 mi,
174°
• Marshall County
30.9 mi,
138°
• Johnson County
19.5 mi,
330°
• Livingston County
18.8 mi,
91°
• Ballard County
20.3 mi,
235°
• Pulaski County
23.2 mi,
269°
• Carlisle County
28.9 mi,
211°
• Pope County
16.5 mi,
32°
• Hardin County
31.9 mi,
49°
[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
*Pope, Johnson Illinois Notes
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