Last official estimated population of Mercer County was 8,411 (year 2014)[1]. This was 0.003% of total US population and 1.1% of total North Dakota state population. Area of Mercer County is 1,112.5 mi² (=2881.3 km²), in this year population density was 7.56 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Mercer County population in 2025 would be 8,375 [0].
Historical population of Mercer County for period 1890-2014 [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

[1890-1900] +15.31 %/yr
[1900-1910] +10.32 %/yr
[1910-1920] +5.65 %/yr
[1920-1930] +1.47 %/yr
[1930-1940] +0.1 %/yr
[1940-1950] -1.01 %/yr
[1950-1960] -2.41 %/yr
[1960-1970] -0.97 %/yr
[1970-1980] +4.3 %/yr
[1980-1990] +0.42 %/yr
[1990-2000] -1.27 %/yr
[2000-2005] -0.63 %/yr
[2005-2010] +0.14 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Mercer County? Visit this page: Settlements in Mercer County, ND
Population of Mercer County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 277 | 282 | 559 |
| 5 to 9 | 287 | 271 | 558 |
| 10 to 14 | 289 | 226 | 515 |
| 15 to 19 | 286 | 225 | 511 |
| 20 to 24 | 226 | 183 | 409 |
| 25 to 29 | 257 | 211 | 468 |
| 30 to 34 | 281 | 243 | 524 |
| 35 to 39 | 257 | 216 | 473 |
| 40 to 44 | 220 | 184 | 404 |
| 45 to 49 | 250 | 278 | 528 |
| 50 to 54 | 412 | 386 | 798 |
| 55 to 59 | 461 | 396 | 857 |
| 60 to 64 | 367 | 285 | 652 |
| 65 to 69 | 234 | 237 | 471 |
| 70 to 74 | 173 | 177 | 350 |
| 75 to 79 | 113 | 136 | 249 |
| 80 to 84 | 86 | 117 | 203 |
| 85+ | 67 | 150 | 217 |
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 | 4440 | 4089 | 8,529 |
| WAC | 4407 | 4050 | 8,457 |
| WA | 4337 | 4006 | 8,343 |
| NHWAC | 4320 | 3967 | 8,287 |
| NHWA | 4257 | 3927 | 8,184 |
| IAC | 148 | 139 | 287 |
| NHIAC | 128 | 104 | 232 |
| H | 103 | 114 | 217 |
| IA | 99 | 109 | 208 |
| HWAC | 87 | 83 | 170 |
| NHIA | 84 | 78 | 162 |
| HWA | 80 | 79 | 159 |
| TOM | 73 | 47 | 120 |
| NHTOM | 66 | 43 | 109 |
| BAC | 43 | 26 | 69 |
| NHBAC | 38 | 25 | 63 |
| HIAC | 20 | 35 | 55 |
| HIA | 15 | 31 | 46 |
| AAC | 17 | 26 | 43 |
| NHAAC | 15 | 26 | 41 |
| BA | 24 | 12 | 36 |
| NHBA | 23 | 12 | 35 |
| AA | 8 | 21 | 29 |
| NHAA | 8 | 21 | 29 |
| NAC | 7 | 11 | 18 |
| NHNAC | 5 | 11 | 16 |
| HTOM | 7 | 4 | 11 |
| NHNA | 2 | 8 | 10 |
| NA | 2 | 8 | 10 |
| HBAC | 5 | 1 | 6 |
| HNAC | 2 | 0 | 2 |
| HAAC | 2 | 0 | 2 |
| HBA | 1 | 0 | 1 |
| HNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Burleigh County population
68.5 mi,
109°
• Ward County
64.3 mi,
12°
• Morton County
48.3 mi,
148°
• Stark County
51.7 mi,
229°
• McLean County
30.7 mi,
38°
• Mountrail County
67.1 mi,
338°
• Dunn County
36.6 mi,
275°
• Hettinger County
67 mi,
205°
• Grant County
66.2 mi,
172°
• Oliver County
26.9 mi,
119°
[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
*Williams North Dakota Notes
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