Last official estimated population of Richland County was 9,738 (year 2014)[1]. This was 0.003% of total US population and 0.9% of total Montana state population. Area of Richland County is 2,103.5 mi² (=5448.1 km²), in this year population density was 4.63 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Richland County population in 2026 would be 9,714 [0].
Historical population of Richland County for period 1920-2014 [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
[1920-1930] +0.69 %/yr
[1930-1940] +0.58 %/yr
[1940-1950] +0.15 %/yr
[1950-1960] +0.13 %/yr
[1960-1970] -0.65 %/yr
[1970-1980] +2.21 %/yr
[1980-1990] -1.32 %/yr
[1990-2000] -1.03 %/yr
[2000-2005] -0.97 %/yr
[2005-2010] +1.14 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Richland County? Visit this page: Settlements in Richland County, MT
Population of Richland County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 381 | 457 | 838 |
| 5 to 9 | 405 | 423 | 828 |
| 10 to 14 | 395 | 361 | 756 |
| 15 to 19 | 388 | 296 | 684 |
| 20 to 24 | 458 | 357 | 815 |
| 25 to 29 | 422 | 367 | 789 |
| 30 to 34 | 426 | 338 | 764 |
| 35 to 39 | 390 | 340 | 730 |
| 40 to 44 | 379 | 346 | 725 |
| 45 to 49 | 344 | 331 | 675 |
| 50 to 54 | 459 | 382 | 841 |
| 55 to 59 | 478 | 442 | 920 |
| 60 to 64 | 392 | 314 | 706 |
| 65 to 69 | 270 | 243 | 513 |
| 70 to 74 | 180 | 190 | 370 |
| 75 to 79 | 125 | 124 | 249 |
| 80 to 84 | 66 | 129 | 195 |
| 85+ | 95 | 83 | 178 |
Richland 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 | 5878 | 5348 | 11,226 |
| NH | 5733 | 5289 | 11,022 |
| WA | 5731 | 5215 | 10,946 |
| NHWAC | 5577 | 5140 | 10,717 |
| NHWA | 5445 | 5011 | 10,456 |
| H | 320 | 234 | 554 |
| HWAC | 301 | 208 | 509 |
| HWA | 286 | 204 | 490 |
| IAC | 213 | 204 | 417 |
| NHIAC | 188 | 183 | 371 |
| TOM | 152 | 135 | 287 |
| NHTOM | 135 | 130 | 265 |
| IA | 108 | 113 | 221 |
| NHIA | 95 | 94 | 189 |
| BAC | 68 | 45 | 113 |
| AAC | 42 | 60 | 102 |
| NHBAC | 62 | 39 | 101 |
| NHAAC | 36 | 57 | 93 |
| AA | 23 | 35 | 58 |
| BA | 33 | 24 | 57 |
| NHAA | 20 | 35 | 55 |
| NHBA | 32 | 18 | 50 |
| HIAC | 25 | 21 | 46 |
| HIA | 13 | 19 | 32 |
| HTOM | 17 | 5 | 22 |
| NAC | 12 | 10 | 22 |
| NHNAC | 11 | 9 | 20 |
| HBAC | 6 | 6 | 12 |
| HAAC | 6 | 3 | 9 |
| NA | 6 | 1 | 7 |
| NHNA | 6 | 1 | 7 |
| HBA | 1 | 6 | 7 |
| HAA | 3 | 0 | 3 |
| HNAC | 1 | 1 | 2 |
| HNA | 0 | 0 | 0 |
• Williams County population
62.9 mi, 
51°
• Roosevelt County
39.7 mi, 
329°
• Dawson County
38.8 mi, 
203°
• McKenzie County
54 mi, 
93°
• Sheridan County
63.6 mi, 
1°
• McCone County
56.5 mi, 
259°
• Golden Valley County
67.5 mi, 
150°
• Prairie County
80.4 mi, 
213°
• Wibaux County
58.4 mi, 
166°
• Billings County
77.7 mi, 
133°
[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
*Dawson Montana Notes
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