Last official estimated population of Deer Lodge County was 9,297 (year 2014)[1]. This was 0.003% of total US population and 0.9% of total Montana state population. Area of Deer Lodge County is 741.4 mi² (=1920.2 km²), in this year population density was 12.54 p/mi². If population growth rate would be same as in period 2010-2014 (-0%/yr), Deer Lodge County population in 2026 would be 9,294 [0].
Historical population of Deer Lodge 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] +7.35 %/yr
[1880-1890] +5.5 %/yr
[1890-1900] +1.39 %/yr
[1900-1910] -2.88 %/yr
[1910-1920] +1.67 %/yr
[1920-1930] +0.62 %/yr
[1930-1940] -1.77 %/yr
[1940-1950] +1.96 %/yr
[1950-1960] +1.19 %/yr
[1960-1970] -1.73 %/yr
[1970-1980] -2.21 %/yr
[1980-1990] -1.88 %/yr
[1990-2000] -0.95 %/yr
[2000-2005] -0.3 %/yr
[2005-2010] +0.05 %/yr
[2010-2014] -0 %/yr
Looking for settlements in Deer Lodge County? Visit this page: Settlements in Deer Lodge County, MT
Population of Deer Lodge County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 194 | 168 | 362 |
| 5 to 9 | 188 | 185 | 373 |
| 10 to 14 | 218 | 205 | 423 |
| 15 to 19 | 361 | 223 | 584 |
| 20 to 24 | 353 | 217 | 570 |
| 25 to 29 | 291 | 199 | 490 |
| 30 to 34 | 257 | 219 | 476 |
| 35 to 39 | 274 | 214 | 488 |
| 40 to 44 | 318 | 254 | 572 |
| 45 to 49 | 337 | 266 | 603 |
| 50 to 54 | 360 | 350 | 710 |
| 55 to 59 | 396 | 385 | 781 |
| 60 to 64 | 427 | 397 | 824 |
| 65 to 69 | 312 | 304 | 616 |
| 70 to 74 | 244 | 223 | 467 |
| 75 to 79 | 176 | 179 | 355 |
| 80 to 84 | 93 | 129 | 222 |
| 85+ | 89 | 145 | 234 |
Deer Lodge 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 | 4707 | 4163 | 8,870 |
| WAC | 4616 | 4110 | 8,726 |
| NHWAC | 4481 | 4028 | 8,509 |
| WA | 4506 | 4000 | 8,506 |
| NHWA | 4387 | 3923 | 8,310 |
| IAC | 292 | 185 | 477 |
| NHIAC | 245 | 167 | 412 |
| IA | 213 | 107 | 320 |
| H | 181 | 99 | 280 |
| NHIA | 176 | 92 | 268 |
| TOM | 118 | 112 | 230 |
| HWAC | 135 | 82 | 217 |
| NHTOM | 99 | 106 | 205 |
| HWA | 119 | 77 | 196 |
| BAC | 59 | 31 | 90 |
| AAC | 37 | 45 | 82 |
| NHBAC | 48 | 28 | 76 |
| NHAAC | 31 | 42 | 73 |
| HIAC | 47 | 18 | 65 |
| HIA | 37 | 15 | 52 |
| AA | 18 | 28 | 46 |
| NHAA | 16 | 27 | 43 |
| BA | 28 | 13 | 41 |
| NHBA | 26 | 13 | 39 |
| HTOM | 19 | 6 | 25 |
| HBAC | 11 | 3 | 14 |
| NAC | 7 | 4 | 11 |
| HAAC | 6 | 3 | 9 |
| NHNAC | 5 | 4 | 9 |
| NA | 5 | 2 | 7 |
| NHNA | 3 | 2 | 5 |
| HAA | 2 | 1 | 3 |
| HNAC | 2 | 0 | 2 |
| HBA | 2 | 0 | 2 |
| HNA | 2 | 0 | 2 |
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[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
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