Last official estimated population of Custer County was 11,699 (year 2014)[1]. This was 0.004% of total US population and 1.1% of total Montana state population. Area of Custer County is 3,793.2 mi² (=9824.3 km²), in this year population density was 3.08 p/mi². If population growth rate would be same as in period 2010-2014 (0%/yr), Custer County population in 2024 would be 11,699 [0].
Historical population of Custer County for period 1870-2014 [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
[1870-1880] +52.05 %/yr
[1880-1890] +7.78 %/yr
[1890-1900] +4.04 %/yr
[1900-1910] +5.99 %/yr
[1910-1920] -1.46 %/yr
[1920-1930] -0.81 %/yr
[1930-1940] -0.75 %/yr
[1940-1950] +1.97 %/yr
[1950-1960] +0.44 %/yr
[1960-1970] -0.83 %/yr
[1970-1980] +0.74 %/yr
[1980-1990] -1.13 %/yr
[1990-2000] -0 %/yr
[2000-2005] -0.47 %/yr
[2005-2010] +0.48 %/yr
[2010-2014] 0 %/yr
Looking for settlements in Custer County? Visit this page: Settlements in Custer County, MT
Population of Custer County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 372 | 390 | 762 |
| 5 to 9 | 394 | 332 | 726 |
| 10 to 14 | 330 | 357 | 687 |
| 15 to 19 | 460 | 336 | 796 |
| 20 to 24 | 370 | 355 | 725 |
| 25 to 29 | 386 | 383 | 769 |
| 30 to 34 | 394 | 377 | 771 |
| 35 to 39 | 325 | 284 | 609 |
| 40 to 44 | 297 | 365 | 662 |
| 45 to 49 | 342 | 346 | 688 |
| 50 to 54 | 460 | 443 | 903 |
| 55 to 59 | 464 | 435 | 899 |
| 60 to 64 | 422 | 414 | 836 |
| 65 to 69 | 342 | 354 | 696 |
| 70 to 74 | 233 | 232 | 465 |
| 75 to 79 | 167 | 222 | 389 |
| 80 to 84 | 149 | 176 | 325 |
| 85+ | 142 | 242 | 384 |
Custer 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 | 5863 | 5862 | 11,725 |
| WAC | 5856 | 5844 | 11,700 |
| WA | 5753 | 5732 | 11,485 |
| NHWAC | 5694 | 5699 | 11,393 |
| NHWA | 5605 | 5597 | 11,202 |
| IAC | 191 | 186 | 377 |
| H | 186 | 181 | 367 |
| NHIAC | 163 | 156 | 319 |
| HWAC | 162 | 145 | 307 |
| HWA | 148 | 135 | 283 |
| IA | 127 | 120 | 247 |
| TOM | 106 | 117 | 223 |
| NHIA | 108 | 98 | 206 |
| NHTOM | 91 | 106 | 197 |
| BAC | 61 | 56 | 117 |
| NHBAC | 53 | 49 | 102 |
| AAC | 36 | 60 | 96 |
| NHAAC | 34 | 59 | 93 |
| BA | 37 | 30 | 67 |
| NHBA | 35 | 26 | 61 |
| HIAC | 28 | 30 | 58 |
| AA | 19 | 35 | 54 |
| NHAA | 19 | 35 | 54 |
| HIA | 19 | 22 | 41 |
| NAC | 14 | 17 | 31 |
| HTOM | 15 | 11 | 26 |
| NHNAC | 12 | 7 | 19 |
| NA | 7 | 9 | 16 |
| HBAC | 8 | 7 | 15 |
| HNAC | 2 | 10 | 12 |
| HNA | 2 | 9 | 11 |
| HBA | 2 | 4 | 6 |
| NHNA | 5 | 0 | 5 |
| HAAC | 2 | 1 | 3 |
| HAA | 0 | 0 | 0 |
• Rosebud County population
53.7 mi, 
263°
• Dawson County
76.3 mi, 
23°
• Fallon County
54.8 mi, 
85°
• McCone County
95 mi, 
354°
• Powder River County
58.9 mi, 
180°
• Golden Valley County
93.5 mi, 
59°
• Prairie County
38.1 mi, 
3°
• Carter County
71.6 mi, 
135°
• Wibaux County
77.6 mi, 
51°
• Treasure County
82.7 mi, 
267°
[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
1870: Big Horn; see note 2 Montana Notes
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