Last official estimated population of Costilla County was 3,528 (year 2014)[1]. This was 0.001% of total US population and 0.1% of total Colorado state population. Area of Costilla County is 1,230.4 mi² (=3186.6 km²), in this year population density was 2.87 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), Costilla County population in 2024 would be 3,538 [0].
Historical population of Costilla 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] +4.93 %/yr
[1880-1890] +1.95 %/yr
[1890-1900] +2.87 %/yr
[1900-1910] +1.73 %/yr
[1910-1920] -0.88 %/yr
[1920-1930] +1.39 %/yr
[1930-1940] +2.69 %/yr
[1940-1950] -2.14 %/yr
[1950-1960] -3.57 %/yr
[1960-1970] -3.06 %/yr
[1970-1980] -0.06 %/yr
[1980-1990] +0.38 %/yr
[1990-2000] +1.39 %/yr
[2000-2005] -0.55 %/yr
[2005-2010] -0.21 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in Costilla County? Visit this page: Settlements in Costilla County, CO
Population of Costilla County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 80 | 60 | 140 |
| 5 to 9 | 99 | 94 | 193 |
| 10 to 14 | 106 | 97 | 203 |
| 15 to 19 | 118 | 94 | 212 |
| 20 to 24 | 121 | 87 | 208 |
| 25 to 29 | 74 | 76 | 150 |
| 30 to 34 | 80 | 73 | 153 |
| 35 to 39 | 64 | 58 | 122 |
| 40 to 44 | 91 | 75 | 166 |
| 45 to 49 | 101 | 93 | 194 |
| 50 to 54 | 141 | 112 | 253 |
| 55 to 59 | 164 | 171 | 335 |
| 60 to 64 | 156 | 162 | 318 |
| 65 to 69 | 171 | 144 | 315 |
| 70 to 74 | 140 | 126 | 266 |
| 75 to 79 | 87 | 74 | 161 |
| 80 to 84 | 53 | 50 | 103 |
| 85+ | 24 | 52 | 76 |
Costilla 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 | 1685 | 1548 | 3,233 |
| WA | 1643 | 1506 | 3,149 |
| H | 1208 | 1086 | 2,294 |
| HWAC | 1078 | 978 | 2,056 |
| HWA | 1052 | 954 | 2,006 |
| NH | 662 | 612 | 1,274 |
| NHWAC | 607 | 570 | 1,177 |
| NHWA | 591 | 552 | 1,143 |
| IAC | 124 | 119 | 243 |
| IA | 104 | 96 | 200 |
| HIAC | 102 | 92 | 194 |
| HIA | 87 | 76 | 163 |
| BAC | 61 | 40 | 101 |
| TOM | 44 | 42 | 86 |
| HBAC | 45 | 26 | 71 |
| BA | 41 | 26 | 67 |
| AAC | 36 | 27 | 63 |
| HTOM | 28 | 24 | 52 |
| NHAAC | 32 | 18 | 50 |
| HBA | 30 | 20 | 50 |
| AA | 30 | 20 | 50 |
| NHIAC | 22 | 27 | 49 |
| NHAA | 26 | 15 | 41 |
| NHIA | 17 | 20 | 37 |
| NHTOM | 16 | 18 | 34 |
| NHBAC | 16 | 14 | 30 |
| NHBA | 11 | 6 | 17 |
| NAC | 8 | 8 | 16 |
| NA | 8 | 8 | 16 |
| HNAC | 7 | 7 | 14 |
| HNA | 7 | 7 | 14 |
| HAAC | 4 | 9 | 13 |
| HAA | 4 | 5 | 9 |
| NHNA | 1 | 1 | 2 |
| NHNAC | 1 | 1 | 2 |
• Pueblo County population
80.3 mi, 
39°
• Taos County
49.8 mi, 
193°
• Alamosa County
28.1 mi, 
315°
• Las Animas County
76.2 mi, 
87°
• Colfax County
63.3 mi, 
136°
• Rio Grande County
58 mi, 
284°
• Conejos County
41.4 mi, 
263°
• Huerfano County
38.3 mi, 42°
• Saguache County
68.2 mi, 319°
• Custer County
57 mi, 
3°
[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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