Last official estimated population of Fergus County was 11,578 (year 2014)[1]. This was 0.004% of total US population and 1.1% of total Montana state population. Area of Fergus County is 4,350.0 mi² (=11266.6 km²), in this year population density was 2.66 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Fergus County population in 2026 would be 11,554 [0].
Historical population of Fergus 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] +7.04 %/yr
[1900-1910] +9.62 %/yr
[1910-1920] +5.01 %/yr
[1920-1930] -5.25 %/yr
[1930-1940] -1.62 %/yr
[1940-1950] -0.02 %/yr
[1950-1960] +0 %/yr
[1960-1970] -1.05 %/yr
[1970-1980] +0.36 %/yr
[1980-1990] -0.79 %/yr
[1990-2000] -0.15 %/yr
[2000-2005] -0.79 %/yr
[2005-2010] +0.25 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Fergus County? Visit this page: Settlements in Fergus County, MT
Population of Fergus County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 290 | 298 | 588 |
| 5 to 9 | 333 | 338 | 671 |
| 10 to 14 | 369 | 305 | 674 |
| 15 to 19 | 307 | 302 | 609 |
| 20 to 24 | 274 | 254 | 528 |
| 25 to 29 | 275 | 264 | 539 |
| 30 to 34 | 344 | 304 | 648 |
| 35 to 39 | 289 | 300 | 589 |
| 40 to 44 | 332 | 316 | 648 |
| 45 to 49 | 313 | 310 | 623 |
| 50 to 54 | 406 | 410 | 816 |
| 55 to 59 | 467 | 476 | 943 |
| 60 to 64 | 475 | 465 | 940 |
| 65 to 69 | 437 | 374 | 811 |
| 70 to 74 | 306 | 299 | 605 |
| 75 to 79 | 227 | 241 | 468 |
| 80 to 84 | 140 | 199 | 339 |
| 85+ | 171 | 232 | 403 |
Fergus 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 | 5622 | 5560 | 11,182 |
| NH | 5622 | 5551 | 11,173 |
| WA | 5533 | 5437 | 10,970 |
| NHWAC | 5494 | 5441 | 10,935 |
| NHWA | 5417 | 5331 | 10,748 |
| IAC | 153 | 157 | 310 |
| NHIAC | 143 | 138 | 281 |
| H | 133 | 136 | 269 |
| HWAC | 128 | 119 | 247 |
| TOM | 93 | 130 | 223 |
| HWA | 116 | 106 | 222 |
| NHTOM | 81 | 115 | 196 |
| IA | 91 | 68 | 159 |
| NHIA | 88 | 58 | 146 |
| BAC | 42 | 58 | 100 |
| NHBAC | 38 | 46 | 84 |
| AAC | 30 | 41 | 71 |
| NHAAC | 28 | 40 | 68 |
| BA | 22 | 31 | 53 |
| NHBA | 20 | 26 | 46 |
| AA | 16 | 21 | 37 |
| NHAA | 16 | 21 | 37 |
| HIAC | 10 | 19 | 29 |
| HTOM | 12 | 15 | 27 |
| HBAC | 4 | 12 | 16 |
| HIA | 3 | 10 | 13 |
| HBA | 2 | 5 | 7 |
| NAC | 2 | 3 | 5 |
| NHNAC | 1 | 3 | 4 |
| HAAC | 2 | 1 | 3 |
| HNAC | 1 | 0 | 1 |
| NHNA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Yellowstone County population
99.6 mi, 
153°
• Blaine County
84.1 mi, 
8°
• Chouteau County
72.8 mi, 
309°
• Musselshell County
61.9 mi, 
143°
• Phillips County
93 mi, 
40°
• Wheatland County
58.4 mi, 
210°
• Judith Basin County
52.5 mi, 
255°
• Meagher County
91.5 mi, 
241°
• Golden Valley County
58.3 mi, 
177°
• Petroleum County
47.2 mi, 
96°
[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
*Meagher, Chouteau; Dawson Montana Notes
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