Last official estimated population of Custer County was 4,358 (year 2014)[1]. This was 0.001% of total US population and 0.3% of total Idaho state population. Area of Custer County is 4,936.5 mi² (=12785.5 km²), in this year population density was 0.88 p/mi². If population growth rate would be same as in period 2010-2014 (-0.06%/yr), Custer County population in 2024 would be 4,333 [0].
Historical population of Custer 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] -0.6 %/yr
[1900-1910] +3.89 %/yr
[1910-1920] +1.69 %/yr
[1920-1930] -1.15 %/yr
[1930-1940] +1.16 %/yr
[1940-1950] -0.67 %/yr
[1950-1960] -1.02 %/yr
[1960-1970] -0.1 %/yr
[1970-1980] +1.33 %/yr
[1980-1990] +2.02 %/yr
[1990-2000] +0.49 %/yr
[2000-2005] -1.21 %/yr
[2005-2010] +1.35 %/yr
[2010-2014] -0.06 %/yr
Looking for settlements in Custer County? Visit this page: Settlements in Custer County, ID
Population of Custer County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 98 | 82 | 180 |
| 5 to 9 | 97 | 95 | 192 |
| 10 to 14 | 112 | 97 | 209 |
| 15 to 19 | 105 | 104 | 209 |
| 20 to 24 | 84 | 92 | 176 |
| 25 to 29 | 95 | 98 | 193 |
| 30 to 34 | 97 | 89 | 186 |
| 35 to 39 | 90 | 90 | 180 |
| 40 to 44 | 123 | 116 | 239 |
| 45 to 49 | 110 | 109 | 219 |
| 50 to 54 | 170 | 181 | 351 |
| 55 to 59 | 201 | 188 | 389 |
| 60 to 64 | 235 | 195 | 430 |
| 65 to 69 | 192 | 148 | 340 |
| 70 to 74 | 154 | 123 | 277 |
| 75 to 79 | 75 | 77 | 152 |
| 80 to 84 | 46 | 68 | 114 |
| 85+ | 40 | 64 | 104 |
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 |
| WAC | 2100 | 1982 | 4,082 |
| WA | 2070 | 1949 | 4,019 |
| NH | 2035 | 1934 | 3,969 |
| NHWAC | 2012 | 1904 | 3,916 |
| NHWA | 1985 | 1874 | 3,859 |
| H | 89 | 82 | 171 |
| HWAC | 88 | 78 | 166 |
| HWA | 85 | 75 | 160 |
| IAC | 34 | 40 | 74 |
| NHIAC | 31 | 36 | 67 |
| TOM | 30 | 33 | 63 |
| NHTOM | 27 | 30 | 57 |
| IA | 12 | 18 | 30 |
| NHIA | 12 | 16 | 28 |
| NHAAC | 11 | 15 | 26 |
| AAC | 11 | 15 | 26 |
| BAC | 10 | 10 | 20 |
| NHBAC | 9 | 7 | 16 |
| NHAA | 6 | 9 | 15 |
| AA | 6 | 9 | 15 |
| BA | 5 | 5 | 10 |
| NHBA | 4 | 3 | 7 |
| HIAC | 3 | 4 | 7 |
| HTOM | 3 | 3 | 6 |
| NAC | 1 | 3 | 4 |
| HBAC | 1 | 3 | 4 |
| NHNAC | 1 | 3 | 4 |
| NA | 1 | 2 | 3 |
| HBA | 1 | 2 | 3 |
| NHNA | 1 | 2 | 3 |
| HIA | 0 | 2 | 2 |
| HNAC | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Elmore County population
85.9 mi, 
225°
• Blaine County
62.5 mi, 
166°
• Valley County
76.4 mi, 
296°
• Beaverhead County
89.4 mi, 
48°
• Lemhi County
48.7 mi, 
21°
• Boise County
75.2 mi, 
254°
• Lincoln County
89.1 mi, 
176°
• Butte County
67.1 mi, 
127°
• Camas County
62.4 mi, 
206°
• Clark County
93.9 mi, 
89°
[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
*Alturas, Idaho, Lemhi Idaho Notes
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