Last official estimated population of Mercer County was 21,340 (year 2014)[1]. This was 0.007% of total US population and 0.5% of total Kentucky state population. Area of Mercer County is 253.3 mi² (=656.1 km²), in this year population density was 84.24 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Mercer County population in 2025 would be 21,365 [0].
Historical population of Mercer County for period 1790-2014 [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
[1790-1800] +3.13 %/yr
[1800-1810] +2.73 %/yr
[1810-1820] +2.13 %/yr
[1820-1830] +1.28 %/yr
[1830-1840] +0.57 %/yr
[1840-1850] -2.82 %/yr
[1850-1860] -0.26 %/yr
[1860-1870] -0.41 %/yr
[1870-1880] +0.73 %/yr
[1880-1890] +0.61 %/yr
[1890-1900] -0.41 %/yr
[1900-1910] -0.25 %/yr
[1910-1920] +0.51 %/yr
[1920-1930] -0.22 %/yr
[1930-1940] +0.11 %/yr
[1940-1950] +0.01 %/yr
[1950-1960] -0.03 %/yr
[1960-1970] +0.9 %/yr
[1970-1980] +1.76 %/yr
[1980-1990] +0.07 %/yr
[1990-2000] +0.84 %/yr
[2000-2005] +0.4 %/yr
[2005-2010] +0.1 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Mercer County? Visit this page: Settlements in Mercer County, KY
Population of Mercer County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 678 | 608 | 1,286 |
| 5 to 9 | 653 | 612 | 1,265 |
| 10 to 14 | 692 | 620 | 1,312 |
| 15 to 19 | 692 | 623 | 1,315 |
| 20 to 24 | 629 | 571 | 1,200 |
| 25 to 29 | 569 | 569 | 1,138 |
| 30 to 34 | 561 | 581 | 1,142 |
| 35 to 39 | 587 | 574 | 1,161 |
| 40 to 44 | 655 | 704 | 1,359 |
| 45 to 49 | 714 | 789 | 1,503 |
| 50 to 54 | 838 | 860 | 1,698 |
| 55 to 59 | 814 | 824 | 1,638 |
| 60 to 64 | 707 | 732 | 1,439 |
| 65 to 69 | 608 | 706 | 1,314 |
| 70 to 74 | 444 | 526 | 970 |
| 75 to 79 | 297 | 412 | 709 |
| 80 to 84 | 171 | 246 | 417 |
| 85+ | 132 | 321 | 453 |
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 |
| NH | 10160 | 10630 | 20,790 |
| WAC | 9906 | 10352 | 20,258 |
| WA | 9727 | 10158 | 19,885 |
| NHWAC | 9678 | 10136 | 19,814 |
| NHWA | 9510 | 9950 | 19,460 |
| BAC | 548 | 516 | 1,064 |
| NHBAC | 514 | 494 | 1,008 |
| BA | 429 | 405 | 834 |
| NHBA | 401 | 388 | 789 |
| H | 281 | 248 | 529 |
| HWAC | 228 | 216 | 444 |
| HWA | 217 | 208 | 425 |
| TOM | 184 | 201 | 385 |
| NHTOM | 171 | 192 | 363 |
| IAC | 91 | 114 | 205 |
| NHIAC | 63 | 102 | 165 |
| AAC | 70 | 87 | 157 |
| NHAAC | 67 | 84 | 151 |
| AA | 50 | 67 | 117 |
| NHAA | 50 | 66 | 116 |
| IA | 36 | 32 | 68 |
| HBAC | 34 | 22 | 56 |
| HBA | 28 | 17 | 45 |
| NAC | 18 | 25 | 43 |
| HIAC | 28 | 12 | 40 |
| NHIA | 15 | 22 | 37 |
| NHNAC | 15 | 19 | 34 |
| HIA | 21 | 10 | 31 |
| NA | 15 | 15 | 30 |
| NHNA | 13 | 12 | 25 |
| HTOM | 13 | 9 | 22 |
| HNAC | 3 | 6 | 9 |
| HAAC | 3 | 3 | 6 |
| HNA | 2 | 3 | 5 |
| HAA | 0 | 1 | 1 |
• Fayette County population
27.9 mi, 
55°
• Jessamine County
16.7 mi, 
75°
• Boyle County
13.4 mi, 
177°
• Woodford County
17.5 mi, 
24°
• Lincoln County
27.3 mi, 
153°
• Anderson County
14.6 mi, 
336°
• Marion County
27.8 mi, 
229°
• Spencer County
28 mi, 
301°
• Garrard County
22.2 mi, 
124°
• Washington County
16.6 mi, 
256°
[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
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