Last official estimated population of Mahnomen County was 5,424 (year 2014)[1]. This was 0.002% of total US population and 0.1% of total Minnesota state population. Area of Mahnomen County is 582.9 mi² (=1509.7 km²), in this year population density was 9.31 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Mahnomen County population in 2026 would be 5,457 [0].
Historical population of Mahnomen County for period 1910-2014 [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

[1910-1920] +6.67 %/yr
[1920-1930] -0.07 %/yr
[1930-1940] +2.73 %/yr
[1940-1950] -1.31 %/yr
[1950-1960] -1.07 %/yr
[1960-1970] -1.17 %/yr
[1970-1980] -0.18 %/yr
[1980-1990] -0.92 %/yr
[1990-2000] +0.29 %/yr
[2000-2005] +0.36 %/yr
[2005-2010] +0.49 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Mahnomen County? Visit this page: Settlements in Mahnomen County, MN
Population of Mahnomen County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 308 | 255 | 563 |
| 5 to 9 | 243 | 217 | 460 |
| 10 to 14 | 228 | 208 | 436 |
| 15 to 19 | 186 | 165 | 351 |
| 20 to 24 | 127 | 184 | 311 |
| 25 to 29 | 120 | 131 | 251 |
| 30 to 34 | 154 | 167 | 321 |
| 35 to 39 | 141 | 135 | 276 |
| 40 to 44 | 149 | 129 | 278 |
| 45 to 49 | 136 | 145 | 281 |
| 50 to 54 | 176 | 168 | 344 |
| 55 to 59 | 214 | 174 | 388 |
| 60 to 64 | 161 | 159 | 320 |
| 65 to 69 | 151 | 150 | 301 |
| 70 to 74 | 98 | 116 | 214 |
| 75 to 79 | 87 | 88 | 175 |
| 80 to 84 | 48 | 70 | 118 |
| 85+ | 36 | 81 | 117 |
Mahnomen 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 | 2668 | 2663 | 5,331 |
| WAC | 1596 | 1565 | 3,161 |
| NHWAC | 1561 | 1540 | 3,101 |
| IAC | 1353 | 1362 | 2,715 |
| WA | 1353 | 1321 | 2,674 |
| NHWA | 1330 | 1305 | 2,635 |
| NHIAC | 1286 | 1307 | 2,593 |
| IA | 1143 | 1155 | 2,298 |
| NHIA | 1084 | 1106 | 2,190 |
| TOM | 247 | 247 | 494 |
| NHTOM | 235 | 238 | 473 |
| H | 95 | 79 | 174 |
| HIAC | 67 | 55 | 122 |
| HIA | 59 | 49 | 108 |
| BAC | 49 | 45 | 94 |
| NHBAC | 44 | 37 | 81 |
| HWAC | 35 | 25 | 60 |
| HWA | 23 | 16 | 39 |
| BA | 17 | 12 | 29 |
| AAC | 11 | 14 | 25 |
| NHAAC | 11 | 14 | 25 |
| NHBA | 16 | 7 | 23 |
| HTOM | 12 | 9 | 21 |
| HBAC | 5 | 8 | 13 |
| AA | 2 | 6 | 8 |
| NHAA | 2 | 6 | 8 |
| NHNAC | 3 | 3 | 6 |
| NAC | 3 | 3 | 6 |
| HBA | 1 | 5 | 6 |
| NHNA | 1 | 1 | 2 |
| NA | 1 | 1 | 2 |
| HNAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
• Clay County population
43.8 mi,
227°
• Beltrami County
53.5 mi,
44°
• Becker County
27.2 mi,
173°
• Polk County
41.3 mi,
318°
• Hubbard County
45.1 mi,
110°
• Pennington County
52.3 mi,
348°
• Clearwater County
26.7 mi,
50°
• Traill County
63.8 mi,
277°
• Norman County
30.6 mi,
270°
• Red Lake County
39.3 mi,
340°
[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
*Norman; see note 5 Minnesota Notes
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