Last official estimated population of Jefferson County was 11,410 (year 2014)[1]. This was 0.004% of total US population and 1.1% of total Montana state population. Area of Jefferson County is 1,659.5 mi² (=4298 km²), in this year population density was 6.88 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Jefferson County population in 2026 would be 11,422 [0].
Historical population of Jefferson 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] +4.87 %/yr
[1880-1890] +9.36 %/yr
[1890-1900] -1.22 %/yr
[1900-1910] +0.5 %/yr
[1910-1920] -0.73 %/yr
[1920-1930] -2.28 %/yr
[1930-1940] +1.22 %/yr
[1940-1950] -1.49 %/yr
[1950-1960] +0.68 %/yr
[1960-1970] +2 %/yr
[1970-1980] +2.98 %/yr
[1980-1990] +1.22 %/yr
[1990-2000] +2.37 %/yr
[2000-2005] +1.31 %/yr
[2005-2010] +1.27 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Jefferson County? Visit this page: Settlements in Jefferson County, MT
Population of Jefferson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 266 | 224 | 490 |
| 5 to 9 | 346 | 301 | 647 |
| 10 to 14 | 383 | 377 | 760 |
| 15 to 19 | 426 | 372 | 798 |
| 20 to 24 | 258 | 219 | 477 |
| 25 to 29 | 236 | 209 | 445 |
| 30 to 34 | 267 | 254 | 521 |
| 35 to 39 | 241 | 255 | 496 |
| 40 to 44 | 357 | 376 | 733 |
| 45 to 49 | 368 | 410 | 778 |
| 50 to 54 | 495 | 509 | 1,004 |
| 55 to 59 | 549 | 569 | 1,118 |
| 60 to 64 | 578 | 548 | 1,126 |
| 65 to 69 | 499 | 419 | 918 |
| 70 to 74 | 303 | 268 | 571 |
| 75 to 79 | 170 | 172 | 342 |
| 80 to 84 | 77 | 92 | 169 |
| 85+ | 72 | 93 | 165 |
Jefferson 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 | 5755 | 5539 | 11,294 |
| WAC | 5746 | 5496 | 11,242 |
| NHWAC | 5618 | 5375 | 10,993 |
| WA | 5608 | 5353 | 10,961 |
| NHWA | 5496 | 5239 | 10,735 |
| IAC | 183 | 227 | 410 |
| NHIAC | 163 | 218 | 381 |
| TOM | 142 | 147 | 289 |
| NHTOM | 126 | 140 | 266 |
| H | 136 | 128 | 264 |
| HWAC | 128 | 121 | 249 |
| HWA | 112 | 114 | 226 |
| IA | 83 | 118 | 201 |
| NHIA | 75 | 112 | 187 |
| BAC | 68 | 35 | 103 |
| NHBAC | 65 | 32 | 97 |
| AAC | 33 | 60 | 93 |
| NHAAC | 32 | 57 | 89 |
| AA | 17 | 40 | 57 |
| NHAA | 17 | 39 | 56 |
| BA | 41 | 7 | 48 |
| NHBA | 41 | 7 | 48 |
| HIAC | 20 | 9 | 29 |
| HTOM | 16 | 7 | 23 |
| HIA | 8 | 6 | 14 |
| NHNAC | 4 | 3 | 7 |
| NAC | 4 | 3 | 7 |
| HBAC | 3 | 3 | 6 |
| HAAC | 1 | 3 | 4 |
| NHNA | 0 | 2 | 2 |
| NA | 0 | 2 | 2 |
| HAA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Gallatin County population
60.1 mi, 
134°
• Lewis and Clark County
70.6 mi, 
347°
• Silver Bow County
32.9 mi, 
241°
• Deer Lodge County
51.9 mi, 
267°
• Beaverhead County
79.4 mi, 
210°
• Madison County
55.6 mi, 
172°
• Powell County
64.8 mi, 
320°
• Broadwater County
30.4 mi, 
62°
• Granite County
68 mi, 
286°
• Meagher County
62.9 mi, 59°
[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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