Last official estimated population of Slope County was 727 (year 2014)[1]. This was 0% of total US population and 0.1% of total North Dakota state population. Area of Slope County is 1,219.2 mi² (=3157.7 km²), in this year population density was 0.60 p/mi². If population growth rate would be same as in period 2010-2014 (0%/yr), Slope County population in 2026 would be 727 [0].
Historical population of Slope 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] -1.73 %/yr
[1930-1940] -3.41 %/yr
[1940-1950] -2.34 %/yr
[1950-1960] -1.99 %/yr
[1960-1970] -2.4 %/yr
[1970-1980] -2.46 %/yr
[1980-1990] -2.41 %/yr
[1990-2000] -1.69 %/yr
[2000-2005] -0.88 %/yr
[2005-2010] -0.14 %/yr
[2010-2014] 0 %/yr
Looking for settlements in Slope County? Visit this page: Settlements in Slope County, ND
Population of Slope County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 28 | 27 | 55 |
| 5 to 9 | 22 | 21 | 43 |
| 10 to 14 | 27 | 12 | 39 |
| 15 to 19 | 29 | 19 | 48 |
| 20 to 24 | 20 | 12 | 32 |
| 25 to 29 | 16 | 14 | 30 |
| 30 to 34 | 28 | 24 | 52 |
| 35 to 39 | 20 | 10 | 30 |
| 40 to 44 | 17 | 17 | 34 |
| 45 to 49 | 25 | 15 | 40 |
| 50 to 54 | 30 | 35 | 65 |
| 55 to 59 | 43 | 34 | 77 |
| 60 to 64 | 32 | 32 | 64 |
| 65 to 69 | 30 | 20 | 50 |
| 70 to 74 | 16 | 13 | 29 |
| 75 to 79 | 10 | 20 | 30 |
| 80 to 84 | 12 | 15 | 27 |
| 85+ | 8 | 12 | 20 |
Slope 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 | 395 | 347 | 742 |
| WAC | 395 | 345 | 740 |
| WA | 391 | 344 | 735 |
| NHWAC | 384 | 343 | 727 |
| NHWA | 381 | 342 | 723 |
| IAC | 17 | 7 | 24 |
| H | 18 | 5 | 23 |
| IA | 13 | 6 | 19 |
| NHIAC | 10 | 4 | 14 |
| HWAC | 11 | 2 | 13 |
| HWA | 10 | 2 | 12 |
| HIA | 7 | 3 | 10 |
| HIAC | 7 | 3 | 10 |
| NHIA | 6 | 3 | 9 |
| BAC | 6 | 1 | 7 |
| TOM | 5 | 2 | 7 |
| NHBAC | 5 | 1 | 6 |
| NHTOM | 4 | 2 | 6 |
| NHBA | 4 | 0 | 4 |
| BA | 4 | 0 | 4 |
| HTOM | 1 | 0 | 1 |
| HBAC | 1 | 0 | 1 |
| AAC | 0 | 1 | 1 |
| NHAAC | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| NHNAC | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| NHAA | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| NAC | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| AA | 0 | 0 | 0 |
• Stark County population
45.8 mi, 
55°
• Dunn County
74.5 mi, 
32°
• Bowman County
23.3 mi, 
185°
• Fallon County
45.8 mi, 
258°
• Hettinger County
48 mi, 
90°
• Adams County
50.5 mi, 
118°
• Golden Valley County
38.6 mi, 
332°
• Harding County
58.7 mi, 
180°
• Wibaux County
52.5 mi, 
312°
• Billings County
39.1 mi, 
6°
[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
*Billings North Dakota Notes
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