Last official estimated population of Niobrara County was 2,491 (year 2014)[1]. This was 0.001% of total US population and 0.4% of total Wyoming state population. Area of Niobrara County is 2,627.9 mi² (=6806.3 km²), in this year population density was 0.95 p/mi². If population growth rate would be same as in period 2010-2014 (+0.07%/yr), Niobrara County population in 2026 would be 2,512 [0].
Historical population of Niobrara 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] -2.87 %/yr
[1930-1940] +2.4 %/yr
[1940-1950] -2.39 %/yr
[1950-1960] -2.23 %/yr
[1960-1970] -2.46 %/yr
[1970-1980] 0 %/yr
[1980-1990] -1.56 %/yr
[1990-2000] -0.36 %/yr
[2000-2005] -0.8 %/yr
[2005-2010] +1.42 %/yr
[2010-2014] +0.07 %/yr
Looking for settlements in Niobrara County? Visit this page: Settlements in Niobrara County, WY
Population of Niobrara County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 68 | 48 | 116 |
| 5 to 9 | 44 | 44 | 88 |
| 10 to 14 | 66 | 47 | 113 |
| 15 to 19 | 72 | 57 | 129 |
| 20 to 24 | 49 | 80 | 129 |
| 25 to 29 | 67 | 102 | 169 |
| 30 to 34 | 71 | 112 | 183 |
| 35 to 39 | 55 | 80 | 135 |
| 40 to 44 | 65 | 103 | 168 |
| 45 to 49 | 58 | 84 | 142 |
| 50 to 54 | 72 | 88 | 160 |
| 55 to 59 | 98 | 115 | 213 |
| 60 to 64 | 98 | 97 | 195 |
| 65 to 69 | 77 | 64 | 141 |
| 70 to 74 | 57 | 76 | 133 |
| 75 to 79 | 51 | 59 | 110 |
| 80 to 84 | 40 | 38 | 78 |
| 85+ | 18 | 43 | 61 |
Niobrara 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 | 1096 | 1304 | 2,400 |
| WAC | 1107 | 1285 | 2,392 |
| WA | 1085 | 1255 | 2,340 |
| NHWAC | 1078 | 1254 | 2,332 |
| NHWA | 1058 | 1225 | 2,283 |
| H | 30 | 33 | 63 |
| IAC | 19 | 44 | 63 |
| HWAC | 29 | 31 | 60 |
| NHIAC | 18 | 41 | 59 |
| HWA | 27 | 30 | 57 |
| TOM | 22 | 34 | 56 |
| NHTOM | 20 | 32 | 52 |
| BAC | 16 | 29 | 45 |
| NHBAC | 14 | 28 | 42 |
| IA | 7 | 23 | 30 |
| NHIA | 7 | 22 | 29 |
| BA | 10 | 18 | 28 |
| NHBA | 9 | 18 | 27 |
| AAC | 6 | 12 | 18 |
| NHAAC | 6 | 11 | 17 |
| AA | 2 | 7 | 9 |
| NHAA | 2 | 7 | 9 |
| HTOM | 2 | 2 | 4 |
| HIAC | 1 | 3 | 4 |
| HBAC | 2 | 1 | 3 |
| NAC | 0 | 3 | 3 |
| NHNAC | 0 | 3 | 3 |
| HBA | 1 | 0 | 1 |
| HAAC | 0 | 1 | 1 |
| HIA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
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[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
*Converse Wyoming Notes
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