Last official estimated population of Foster County was 3,343 (year 2014)[1]. This was 0.001% of total US population and 0.4% of total North Dakota state population. Area of Foster County is 646.8 mi² (=1675.3 km²), in this year population density was 5.17 p/mi². If population growth rate would be same as in period 2010-2014 (0%/yr), Foster County population in 2026 would be 3,343 [0].
Historical population of Foster County for period 1880-2014 [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

[1880-1890] +41.73 %/yr
[1890-1900] +12.04 %/yr
[1900-1910] +3.49 %/yr
[1910-1920] +1.4 %/yr
[1920-1930] +0.39 %/yr
[1930-1940] -0.87 %/yr
[1940-1950] -0.87 %/yr
[1950-1960] +0.04 %/yr
[1960-1970] -1.03 %/yr
[1970-1980] -0.47 %/yr
[1980-1990] -1.45 %/yr
[1990-2000] -0.57 %/yr
[2000-2005] -1.07 %/yr
[2005-2010] -1.27 %/yr
[2010-2014] 0 %/yr
Looking for settlements in Foster County? Visit this page: Settlements in Foster County, ND
Population of Foster County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 89 | 90 | 179 |
| 5 to 9 | 110 | 95 | 205 |
| 10 to 14 | 90 | 111 | 201 |
| 15 to 19 | 100 | 104 | 204 |
| 20 to 24 | 96 | 77 | 173 |
| 25 to 29 | 99 | 61 | 160 |
| 30 to 34 | 98 | 88 | 186 |
| 35 to 39 | 82 | 75 | 157 |
| 40 to 44 | 90 | 95 | 185 |
| 45 to 49 | 84 | 104 | 188 |
| 50 to 54 | 149 | 128 | 277 |
| 55 to 59 | 160 | 128 | 288 |
| 60 to 64 | 110 | 108 | 218 |
| 65 to 69 | 89 | 100 | 189 |
| 70 to 74 | 56 | 60 | 116 |
| 75 to 79 | 56 | 90 | 146 |
| 80 to 84 | 66 | 70 | 136 |
| 85+ | 52 | 102 | 154 |
Foster 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 | 1657 | 1666 | 3,323 |
| WAC | 1647 | 1653 | 3,300 |
| WA | 1637 | 1637 | 3,274 |
| NHWAC | 1628 | 1633 | 3,261 |
| NHWA | 1618 | 1619 | 3,237 |
| IAC | 23 | 24 | 47 |
| NHIAC | 23 | 23 | 46 |
| H | 19 | 20 | 39 |
| HWAC | 19 | 20 | 39 |
| HWA | 19 | 18 | 37 |
| NHIA | 16 | 17 | 33 |
| IA | 16 | 17 | 33 |
| TOM | 12 | 17 | 29 |
| NHTOM | 12 | 15 | 27 |
| BAC | 10 | 12 | 22 |
| NHBAC | 10 | 11 | 21 |
| NHAAC | 7 | 14 | 21 |
| AAC | 7 | 14 | 21 |
| NHAA | 6 | 10 | 16 |
| AA | 6 | 10 | 16 |
| NHBA | 5 | 5 | 10 |
| BA | 5 | 5 | 10 |
| HTOM | 0 | 2 | 2 |
| NHNAC | 1 | 0 | 1 |
| NAC | 1 | 0 | 1 |
| HIAC | 0 | 1 | 1 |
| HBAC | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HIA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Stutsman County population
34.7 mi,
186°
• Ramsey County
55.3 mi,
6°
• Barnes County
52.5 mi,
134°
• Benson County
47 mi,
331°
• Wells County
38.5 mi,
281°
• Nelson County
43.8 mi,
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• Kidder County
54.6 mi,
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• Griggs County
29.9 mi,
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• Eddy County
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• Steele County
53.9 mi,
91°
[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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