Last official estimated population of Trego County was 2,990 (year 2014)[1]. This was 0.001% of total US population and 0.1% of total Kansas state population. Area of Trego County is 899.6 mi² (=2330 km²), in this year population density was 3.32 p/mi². If population growth rate would be same as in period 2010-2014 (-0.09%/yr), Trego County population in 2026 would be 2,957 [0].
Historical population of Trego 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] +31.34 %/yr
[1880-1890] 0 %/yr
[1890-1900] +0.71 %/yr
[1900-1910] +7.09 %/yr
[1910-1920] +0.86 %/yr
[1920-1930] +0.96 %/yr
[1930-1940] -1.05 %/yr
[1940-1950] +0.08 %/yr
[1950-1960] -0.69 %/yr
[1960-1970] -2.08 %/yr
[1970-1980] -0.63 %/yr
[1980-1990] -1.19 %/yr
[1990-2000] -1.09 %/yr
[2000-2005] -1.79 %/yr
[2005-2010] -0.16 %/yr
[2010-2014] -0.09 %/yr
Looking for settlements in Trego County? Visit this page: Settlements in Trego County, KS
Population of Trego County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 59 | 70 | 129 |
| 5 to 9 | 74 | 62 | 136 |
| 10 to 14 | 77 | 76 | 153 |
| 15 to 19 | 75 | 81 | 156 |
| 20 to 24 | 68 | 67 | 135 |
| 25 to 29 | 78 | 69 | 147 |
| 30 to 34 | 67 | 83 | 150 |
| 35 to 39 | 66 | 66 | 132 |
| 40 to 44 | 92 | 67 | 159 |
| 45 to 49 | 71 | 82 | 153 |
| 50 to 54 | 120 | 124 | 244 |
| 55 to 59 | 136 | 128 | 264 |
| 60 to 64 | 117 | 126 | 243 |
| 65 to 69 | 97 | 82 | 179 |
| 70 to 74 | 78 | 74 | 152 |
| 75 to 79 | 59 | 71 | 130 |
| 80 to 84 | 48 | 67 | 115 |
| 85+ | 52 | 73 | 125 |
Trego 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 | 1412 | 1446 | 2,858 |
| NH | 1408 | 1435 | 2,843 |
| WA | 1399 | 1427 | 2,826 |
| NHWAC | 1386 | 1414 | 2,800 |
| NHWA | 1375 | 1399 | 2,774 |
| H | 26 | 33 | 59 |
| HWAC | 26 | 32 | 58 |
| HWA | 24 | 28 | 52 |
| TOM | 13 | 20 | 33 |
| BAC | 17 | 14 | 31 |
| NHBAC | 17 | 12 | 29 |
| IAC | 12 | 14 | 26 |
| NHTOM | 11 | 15 | 26 |
| NHIAC | 11 | 11 | 22 |
| NHBA | 11 | 9 | 20 |
| BA | 11 | 9 | 20 |
| AAC | 7 | 12 | 19 |
| NHAAC | 6 | 11 | 17 |
| NHAA | 4 | 9 | 13 |
| AA | 4 | 9 | 13 |
| IA | 6 | 2 | 8 |
| NHIA | 6 | 2 | 8 |
| HTOM | 2 | 5 | 7 |
| HIAC | 1 | 3 | 4 |
| NAC | 1 | 2 | 3 |
| NHNAC | 1 | 2 | 3 |
| NA | 1 | 1 | 2 |
| NHNA | 1 | 1 | 2 |
| HAAC | 1 | 1 | 2 |
| HBAC | 0 | 2 | 2 |
| HNAC | 0 | 0 | 0 |
| HIA | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Ellis County population
29.5 mi, 
90°
• Russell County
58.8 mi, 90°
• Rooks County
41.2 mi, 
44°
• Rush County
40.7 mi, 
132°
• Ness County
30.5 mi, 
184°
• Gove County
33.4 mi, 
269°
• Graham County
30 mi, 
358°
• Sheridan County
42.8 mi, 
313°
• Hodgeman County
57.6 mi, 181°
• Lane County
44.4 mi, 
226°
[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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