Last official estimated population of Lewis and Clark County was 63,590 (year 2014)[1]. This was 0.02% of total US population and 6.2% of total Montana state population. Area of Lewis and Clark County is 3,497.6 mi² (=9058.7 km²), in this year population density was 18.18 p/mi². If population growth rate would be same as in period 2010-2014 (+0.08%/yr), Lewis and Clark County population in 2025 would be 64,129 [0].
Historical population of Lewis and Clark 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] +2.61 %/yr
[1880-1890] +11.37 %/yr
[1890-1900] +0.01 %/yr
[1900-1910] +1.32 %/yr
[1910-1920] -1.57 %/yr
[1920-1930] -0.24 %/yr
[1930-1940] +1.96 %/yr
[1940-1950] +1.04 %/yr
[1950-1960] +1.33 %/yr
[1960-1970] +1.74 %/yr
[1970-1980] +2.6 %/yr
[1980-1990] +0.99 %/yr
[1990-2000] +1.61 %/yr
[2000-2005] +0.99 %/yr
[2005-2010] +1.61 %/yr
[2010-2014] +0.08 %/yr
Looking for settlements in Lewis and Clark County? Visit this page: Settlements in Lewis and Clark County, MT
Population of Lewis and Clark County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1945 | 1929 | 3,874 |
| 5 to 9 | 2026 | 1958 | 3,984 |
| 10 to 14 | 2070 | 1960 | 4,030 |
| 15 to 19 | 2126 | 1996 | 4,122 |
| 20 to 24 | 1930 | 1914 | 3,844 |
| 25 to 29 | 1920 | 1999 | 3,919 |
| 30 to 34 | 2226 | 2154 | 4,380 |
| 35 to 39 | 1900 | 1872 | 3,772 |
| 40 to 44 | 1833 | 1933 | 3,766 |
| 45 to 49 | 1985 | 2089 | 4,074 |
| 50 to 54 | 2423 | 2610 | 5,033 |
| 55 to 59 | 2494 | 2752 | 5,246 |
| 60 to 64 | 2525 | 2589 | 5,114 |
| 65 to 69 | 1955 | 1859 | 3,814 |
| 70 to 74 | 1281 | 1316 | 2,597 |
| 75 to 79 | 763 | 896 | 1,659 |
| 80 to 84 | 502 | 685 | 1,187 |
| 85+ | 483 | 958 | 1,441 |
Lewis and Clark 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 | 31465 | 32429 | 63,894 |
| WAC | 31231 | 32252 | 63,483 |
| WA | 30456 | 31483 | 61,939 |
| NHWAC | 30405 | 31327 | 61,732 |
| NHWA | 29722 | 30635 | 60,357 |
| IAC | 1301 | 1277 | 2,578 |
| NHIAC | 1163 | 1131 | 2,294 |
| H | 922 | 1040 | 1,962 |
| HWAC | 826 | 925 | 1,751 |
| TOM | 808 | 790 | 1,598 |
| HWA | 734 | 848 | 1,582 |
| IA | 731 | 718 | 1,449 |
| NHTOM | 708 | 711 | 1,419 |
| NHIA | 664 | 627 | 1,291 |
| AAC | 328 | 445 | 773 |
| NHAAC | 302 | 419 | 721 |
| BAC | 297 | 265 | 562 |
| NHBAC | 270 | 242 | 512 |
| AA | 179 | 293 | 472 |
| NHAA | 174 | 286 | 460 |
| BA | 174 | 157 | 331 |
| NHBA | 162 | 144 | 306 |
| HIAC | 138 | 146 | 284 |
| HTOM | 100 | 79 | 179 |
| HIA | 67 | 91 | 158 |
| NAC | 73 | 62 | 135 |
| NHNAC | 62 | 57 | 119 |
| NA | 39 | 28 | 67 |
| NHNA | 35 | 26 | 61 |
| HAAC | 26 | 26 | 52 |
| HBAC | 27 | 23 | 50 |
| HBA | 12 | 13 | 25 |
| HNAC | 11 | 5 | 16 |
| HAA | 5 | 7 | 12 |
| HNA | 4 | 2 | 6 |
• Missoula County population
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264°
• Cascade County
50.3 mi, 
74°
• Jefferson County
70.6 mi, 
167°
• Deer Lodge County
79.6 mi, 
206°
• Powell County
32.2 mi, 
233°
• Pondera County
76.9 mi, 
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• Teton County
48.4 mi, 5°
• Broadwater County
68.9 mi, 
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• Granite County
70.4 mi, 
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• Meagher County
78.4 mi, 
118°
[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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