Last official estimated population of Mercer County was 40,767 (year 2014)[1]. This was 0.013% of total US population and 0.4% of total Ohio state population. Area of Mercer County is 473.4 mi² (=1226.2 km²), in this year population density was 86.11 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Mercer County population in 2024 would be 40,650 [0].
Historical population of Mercer County for period 1820-2014 [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
[1820-1830] +27.87 %/yr
[1830-1840] +22.25 %/yr
[1840-1850] -0.7 %/yr
[1850-1860] +6.22 %/yr
[1860-1870] +2.04 %/yr
[1870-1880] +2.37 %/yr
[1880-1890] +2.24 %/yr
[1890-1900] +0.29 %/yr
[1900-1910] -0.17 %/yr
[1910-1920] -0.24 %/yr
[1920-1930] -0.68 %/yr
[1930-1940] +0.45 %/yr
[1940-1950] +0.76 %/yr
[1950-1960] +1.41 %/yr
[1960-1970] +0.8 %/yr
[1970-1980] +0.84 %/yr
[1980-1990] +0.29 %/yr
[1990-2000] +0.37 %/yr
[2000-2005] +0.02 %/yr
[2005-2010] -0.07 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Mercer County? Visit this page: Settlements in Mercer County, OH
Population of Mercer County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1394 | 1268 | 2,662 |
| 5 to 9 | 1482 | 1451 | 2,933 |
| 10 to 14 | 1522 | 1387 | 2,909 |
| 15 to 19 | 1428 | 1347 | 2,775 |
| 20 to 24 | 1268 | 1238 | 2,506 |
| 25 to 29 | 1146 | 1030 | 2,176 |
| 30 to 34 | 1225 | 1141 | 2,366 |
| 35 to 39 | 1135 | 1038 | 2,173 |
| 40 to 44 | 1158 | 1095 | 2,253 |
| 45 to 49 | 1208 | 1184 | 2,392 |
| 50 to 54 | 1508 | 1469 | 2,977 |
| 55 to 59 | 1585 | 1547 | 3,132 |
| 60 to 64 | 1383 | 1326 | 2,709 |
| 65 to 69 | 1031 | 1006 | 2,037 |
| 70 to 74 | 737 | 804 | 1,541 |
| 75 to 79 | 526 | 688 | 1,214 |
| 80 to 84 | 394 | 605 | 999 |
| 85+ | 375 | 702 | 1,077 |
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 | 20196 | 20025 | 40,221 |
| NH | 20119 | 19969 | 40,088 |
| WA | 20028 | 19837 | 39,865 |
| NHWAC | 19844 | 19708 | 39,552 |
| NHWA | 19695 | 19538 | 39,233 |
| H | 386 | 357 | 743 |
| HWAC | 352 | 317 | 669 |
| HWA | 333 | 299 | 632 |
| TOM | 184 | 202 | 386 |
| BAC | 201 | 168 | 369 |
| NHTOM | 162 | 178 | 340 |
| NHBAC | 181 | 141 | 322 |
| AAC | 121 | 148 | 269 |
| IAC | 134 | 127 | 261 |
| NHAAC | 117 | 143 | 260 |
| NHIAC | 101 | 99 | 200 |
| AA | 82 | 115 | 197 |
| NHAA | 81 | 113 | 194 |
| BA | 107 | 55 | 162 |
| NHBA | 96 | 42 | 138 |
| IA | 63 | 56 | 119 |
| NAC | 46 | 69 | 115 |
| NHNAC | 44 | 65 | 109 |
| NA | 41 | 61 | 102 |
| NHNA | 40 | 57 | 97 |
| NHIA | 45 | 41 | 86 |
| HIAC | 33 | 28 | 61 |
| HBAC | 20 | 27 | 47 |
| HTOM | 22 | 24 | 46 |
| HIA | 18 | 15 | 33 |
| HBA | 11 | 13 | 24 |
| HAAC | 4 | 5 | 9 |
| HNAC | 2 | 4 | 6 |
| HNA | 1 | 4 | 5 |
| HAA | 1 | 2 | 3 |
• Allen County population
32 mi, 
59°
• Darke County
27.9 mi, 
178°
• Shelby County
26.4 mi, 
121°
• Auglaize County
21.5 mi, 
85°
• Adams County
21.6 mi, 
312°
• Van Wert County
22.3 mi, 
6°
• Wells County
33.4 mi, 
294°
• Randolph County
32.3 mi, 
217°
• Jay County
20.7 mi, 
250°
• Blackford County
36.6 mi, 
263°
[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
*Montgomery; see note12 Ohio Notes
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