Last official estimated population of Mercer County was 16,425 (year 2014)[1]. This was 0.005% of total US population and 0.1% of total Illinois state population. Area of Mercer County is 568.7 mi² (=1472.9 km²), in this year population density was 28.88 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Mercer County population in 2026 would be 16,398 [0].
Historical population of Mercer County for period 1830-2014 [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
[1830-1840] +56.91 %/yr
[1840-1850] +8.35 %/yr
[1850-1860] +11.11 %/yr
[1860-1870] +2.24 %/yr
[1870-1880] +0.38 %/yr
[1880-1890] -0.5 %/yr
[1890-1900] +1.22 %/yr
[1900-1910] -0.6 %/yr
[1910-1920] -0.48 %/yr
[1920-1930] -1.21 %/yr
[1930-1940] +0.62 %/yr
[1940-1950] -0.19 %/yr
[1950-1960] -0.13 %/yr
[1960-1970] +0.08 %/yr
[1970-1980] +1.1 %/yr
[1980-1990] -1.09 %/yr
[1990-2000] -0.2 %/yr
[2000-2005] -0.29 %/yr
[2005-2010] -0.31 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Mercer County? Visit this page: Settlements in Mercer County, IL
Population of Mercer County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 376 | 413 | 789 |
| 5 to 9 | 479 | 480 | 959 |
| 10 to 14 | 532 | 530 | 1,062 |
| 15 to 19 | 533 | 453 | 986 |
| 20 to 24 | 422 | 399 | 821 |
| 25 to 29 | 368 | 350 | 718 |
| 30 to 34 | 421 | 413 | 834 |
| 35 to 39 | 419 | 448 | 867 |
| 40 to 44 | 486 | 462 | 948 |
| 45 to 49 | 493 | 575 | 1,068 |
| 50 to 54 | 626 | 633 | 1,259 |
| 55 to 59 | 624 | 582 | 1,206 |
| 60 to 64 | 598 | 567 | 1,165 |
| 65 to 69 | 482 | 481 | 963 |
| 70 to 74 | 431 | 440 | 871 |
| 75 to 79 | 251 | 302 | 553 |
| 80 to 84 | 173 | 229 | 402 |
| 85+ | 162 | 312 | 474 |
Mercer 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 | 7784 | 7985 | 15,769 |
| WA | 7710 | 7938 | 15,648 |
| NH | 7727 | 7886 | 15,613 |
| NHWAC | 7639 | 7807 | 15,446 |
| NHWA | 7570 | 7762 | 15,332 |
| H | 149 | 183 | 332 |
| HWAC | 145 | 178 | 323 |
| HWA | 140 | 176 | 316 |
| BAC | 94 | 66 | 160 |
| NHBAC | 91 | 61 | 152 |
| TOM | 77 | 51 | 128 |
| NHTOM | 72 | 47 | 119 |
| BA | 52 | 40 | 92 |
| NHBA | 51 | 38 | 89 |
| AAC | 33 | 43 | 76 |
| NHAAC | 32 | 42 | 74 |
| IAC | 40 | 24 | 64 |
| NHIAC | 34 | 22 | 56 |
| AA | 21 | 34 | 55 |
| NHAA | 20 | 34 | 54 |
| IA | 14 | 4 | 18 |
| NHIA | 12 | 4 | 16 |
| HTOM | 5 | 4 | 9 |
| HIAC | 6 | 2 | 8 |
| HBAC | 3 | 5 | 8 |
| NAC | 4 | 2 | 6 |
| NHNAC | 4 | 1 | 5 |
| NA | 2 | 2 | 4 |
| NHNA | 2 | 1 | 3 |
| HBA | 1 | 2 | 3 |
| HIA | 2 | 0 | 2 |
| HAAC | 1 | 1 | 2 |
| HAA | 1 | 0 | 1 |
| HNAC | 0 | 1 | 1 |
| HNA | 0 | 1 | 1 |
• Scott County population
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• Henry County
33.3 mi, 
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• Muscatine County
27.5 mi, 
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• Des Moines County
30.6 mi, 
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• Cedar County
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• Warren County
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• Louisa County
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• Henderson County
28.9 mi, 
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[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
*Madison Illinois Notes
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