Last official estimated population of Castro County was 8,111 (year 2014)[1]. This was 0.003% of total US population and 0% of total Texas state population. Area of Castro County is 899.3 mi² (=2329.2 km²), in this year population density was 9.02 p/mi². If population growth rate would be same as in period 2010-2014 (+0.15%/yr), Castro County population in 2026 would be 8,260 [0].
Historical population of Castro County for period 1890-2014 [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
[1890-1900] +46.14 %/yr
[1900-1910] +16.55 %/yr
[1910-1920] +0.52 %/yr
[1920-1930] +9.25 %/yr
[1930-1940] -0.19 %/yr
[1940-1950] +1.58 %/yr
[1950-1960] +5.12 %/yr
[1960-1970] +1.54 %/yr
[1970-1980] +0.15 %/yr
[1980-1990] -1.51 %/yr
[1990-2000] -0.91 %/yr
[2000-2005] -0.91 %/yr
[2005-2010] +0.39 %/yr
[2010-2014] +0.15 %/yr
Looking for settlements in Castro County? Visit this page: Settlements in Castro County, TX
Population of Castro County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 370 | 327 | 697 |
| 5 to 9 | 337 | 308 | 645 |
| 10 to 14 | 327 | 302 | 629 |
| 15 to 19 | 309 | 309 | 618 |
| 20 to 24 | 231 | 251 | 482 |
| 25 to 29 | 231 | 210 | 441 |
| 30 to 34 | 201 | 222 | 423 |
| 35 to 39 | 255 | 214 | 469 |
| 40 to 44 | 232 | 188 | 420 |
| 45 to 49 | 196 | 192 | 388 |
| 50 to 54 | 258 | 252 | 510 |
| 55 to 59 | 253 | 240 | 493 |
| 60 to 64 | 241 | 235 | 476 |
| 65 to 69 | 149 | 148 | 297 |
| 70 to 74 | 126 | 126 | 252 |
| 75 to 79 | 112 | 122 | 234 |
| 80 to 84 | 86 | 96 | 182 |
| 85+ | 52 | 73 | 125 |
Castro 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 | 3781 | 3625 | 7,406 |
| WA | 3742 | 3590 | 7,332 |
| H | 2517 | 2363 | 4,880 |
| HWAC | 2442 | 2282 | 4,724 |
| HWA | 2417 | 2260 | 4,677 |
| NH | 1449 | 1452 | 2,901 |
| NHWAC | 1339 | 1343 | 2,682 |
| NHWA | 1325 | 1330 | 2,655 |
| BAC | 118 | 119 | 237 |
| BA | 102 | 100 | 202 |
| NHBAC | 87 | 82 | 169 |
| IAC | 79 | 78 | 157 |
| NHBA | 80 | 73 | 153 |
| IA | 62 | 65 | 127 |
| HIAC | 60 | 56 | 116 |
| HIA | 46 | 48 | 94 |
| TOM | 40 | 38 | 78 |
| HBAC | 31 | 37 | 68 |
| AAC | 25 | 30 | 55 |
| HTOM | 26 | 24 | 50 |
| HBA | 22 | 27 | 49 |
| NHIAC | 19 | 22 | 41 |
| AA | 19 | 22 | 41 |
| NHAAC | 17 | 19 | 36 |
| NHIA | 16 | 17 | 33 |
| NHAA | 14 | 18 | 32 |
| NHTOM | 14 | 14 | 28 |
| HAAC | 8 | 11 | 19 |
| HAA | 5 | 4 | 9 |
| NAC | 3 | 1 | 4 |
| HNAC | 2 | 1 | 3 |
| NHNAC | 1 | 0 | 1 |
| NA | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
| NHNA | 0 | 0 | 0 |
• Randall County population
36.1 mi, 
34°
• Curry County
61.9 mi, 
272°
• Hale County
40.6 mi, 
142°
• Deaf Smith County
34.4 mi, 
324°
• Lamb County
32.5 mi, 
189°
• Parmer County
29.9 mi, 269°
• Swisher County
29.3 mi, 
90°
• Bailey County
45.8 mi, 
225°
• Armstrong County
59.2 mi, 
59°
• Briscoe County
59.9 mi, 90°
[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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