Last official estimated population of Piatt County was 16,712 (year 2014)[1]. This was 0.005% of total US population and 0.1% of total Illinois state population. Area of Piatt County is 439.5 mi² (=1138.2 km²), in this year population density was 38.03 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Piatt County population in 2026 would be 16,661 [0].
Historical population of Piatt 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] +14.33 %/yr
[1860-1870] +5.98 %/yr
[1870-1880] +3.59 %/yr
[1880-1890] +0.91 %/yr
[1890-1900] +0.37 %/yr
[1900-1910] -0.78 %/yr
[1910-1920] -0.41 %/yr
[1920-1930] -0.08 %/yr
[1930-1940] -0.61 %/yr
[1940-1950] -0.48 %/yr
[1950-1960] +0.69 %/yr
[1960-1970] +0.36 %/yr
[1970-1980] +0.67 %/yr
[1980-1990] -0.64 %/yr
[1990-2000] +0.53 %/yr
[2000-2005] +0.32 %/yr
[2005-2010] +0.1 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Piatt County? Visit this page: Settlements in Piatt County, IL
Population of Piatt County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 447 | 404 | 851 |
| 5 to 9 | 493 | 449 | 942 |
| 10 to 14 | 596 | 545 | 1,141 |
| 15 to 19 | 542 | 536 | 1,078 |
| 20 to 24 | 439 | 411 | 850 |
| 25 to 29 | 418 | 391 | 809 |
| 30 to 34 | 483 | 435 | 918 |
| 35 to 39 | 474 | 490 | 964 |
| 40 to 44 | 488 | 504 | 992 |
| 45 to 49 | 510 | 552 | 1,062 |
| 50 to 54 | 684 | 703 | 1,387 |
| 55 to 59 | 665 | 684 | 1,349 |
| 60 to 64 | 548 | 558 | 1,106 |
| 65 to 69 | 468 | 467 | 935 |
| 70 to 74 | 336 | 351 | 687 |
| 75 to 79 | 245 | 321 | 566 |
| 80 to 84 | 160 | 236 | 396 |
| 85+ | 164 | 234 | 398 |
Piatt 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 | 8072 | 8182 | 16,254 |
| WAC | 8055 | 8157 | 16,212 |
| NHWAC | 7973 | 8071 | 16,044 |
| WA | 7960 | 8078 | 16,038 |
| NHWA | 7881 | 8001 | 15,882 |
| TOM | 97 | 84 | 181 |
| H | 88 | 89 | 177 |
| BAC | 96 | 75 | 171 |
| NHTOM | 94 | 75 | 169 |
| HWAC | 82 | 86 | 168 |
| NHBAC | 92 | 71 | 163 |
| HWA | 79 | 77 | 156 |
| AAC | 57 | 73 | 130 |
| NHAAC | 57 | 70 | 127 |
| IAC | 47 | 47 | 94 |
| BA | 52 | 39 | 91 |
| NHBA | 49 | 39 | 88 |
| NHIAC | 42 | 42 | 84 |
| AA | 30 | 53 | 83 |
| NHAA | 30 | 50 | 80 |
| IA | 19 | 12 | 31 |
| NHIA | 16 | 12 | 28 |
| NHNAC | 6 | 9 | 15 |
| NAC | 6 | 9 | 15 |
| HTOM | 3 | 9 | 12 |
| HIAC | 5 | 5 | 10 |
| HBAC | 4 | 4 | 8 |
| NA | 2 | 5 | 7 |
| NHNA | 2 | 5 | 7 |
| HIA | 3 | 0 | 3 |
| HBA | 3 | 0 | 3 |
| HAAC | 0 | 3 | 3 |
| HAA | 0 | 3 | 3 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Champaign County population
22.7 mi, 
66°
• McLean County
36.1 mi, 
338°
• Macon County
22.1 mi, 
242°
• Coles County
39.5 mi, 
150°
• Logan County
41.7 mi, 
281°
• Shelby County
44.5 mi, 
194°
• Douglas County
25.8 mi, 
130°
• De Witt County
20.2 mi, 
306°
• Moultrie County
25.8 mi, 
183°
• Ford County
45 mi, 
25°
[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
*Macon, De Witt Illinois Notes
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