Last official estimated population of Colusa County was 21,459 (year 2014)[1]. This was 0.007% of total US population and 0.1% of total California state population. Area of Colusa County is 1,156.4 mi² (=2995 km²), in this year population density was 18.56 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Colusa County population in 2026 would be 21,579 [0].
Historical population of Colusa County for period 1850-2014 [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
[1850-1860] +34.77 %/yr
[1860-1870] +10.49 %/yr
[1870-1880] +7.84 %/yr
[1880-1890] +1.1 %/yr
[1890-1900] -6.64 %/yr
[1900-1910] +0.49 %/yr
[1910-1920] +1.85 %/yr
[1920-1930] +1 %/yr
[1930-1940] -0.47 %/yr
[1940-1950] +1.76 %/yr
[1950-1960] +0.36 %/yr
[1960-1970] +0.29 %/yr
[1970-1980] +0.29 %/yr
[1980-1990] +2.44 %/yr
[1990-2000] +1.45 %/yr
[2000-2005] +1.79 %/yr
[2005-2010] +0.84 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Colusa County? Visit this page: Settlements in Colusa County, CA
Population of Colusa County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 778 | 803 | 1,581 |
| 5 to 9 | 948 | 853 | 1,801 |
| 10 to 14 | 858 | 763 | 1,621 |
| 15 to 19 | 882 | 731 | 1,613 |
| 20 to 24 | 778 | 684 | 1,462 |
| 25 to 29 | 730 | 650 | 1,380 |
| 30 to 34 | 732 | 675 | 1,407 |
| 35 to 39 | 642 | 640 | 1,282 |
| 40 to 44 | 638 | 602 | 1,240 |
| 45 to 49 | 687 | 630 | 1,317 |
| 50 to 54 | 703 | 685 | 1,388 |
| 55 to 59 | 705 | 650 | 1,355 |
| 60 to 64 | 577 | 585 | 1,162 |
| 65 to 69 | 471 | 447 | 918 |
| 70 to 74 | 361 | 340 | 701 |
| 75 to 79 | 228 | 245 | 473 |
| 80 to 84 | 140 | 186 | 326 |
| 85+ | 145 | 247 | 392 |
Colusa 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 | 10307 | 9748 | 20,055 |
| WA | 10071 | 9545 | 19,616 |
| H | 6550 | 5905 | 12,455 |
| HWAC | 6278 | 5673 | 11,951 |
| HWA | 6167 | 5598 | 11,765 |
| NH | 4453 | 4511 | 8,964 |
| NHWAC | 4029 | 4075 | 8,104 |
| NHWA | 3904 | 3947 | 7,851 |
| IAC | 387 | 361 | 748 |
| IA | 284 | 270 | 554 |
| AAC | 250 | 257 | 507 |
| TOM | 254 | 233 | 487 |
| BAC | 234 | 204 | 438 |
| NHAAC | 189 | 202 | 391 |
| HIAC | 214 | 169 | 383 |
| AA | 185 | 194 | 379 |
| NHIAC | 173 | 192 | 365 |
| NHBAC | 156 | 146 | 302 |
| NHAA | 143 | 157 | 300 |
| NHTOM | 136 | 151 | 287 |
| HIA | 151 | 132 | 283 |
| NHIA | 133 | 138 | 271 |
| BA | 146 | 115 | 261 |
| HTOM | 118 | 82 | 200 |
| NHBA | 104 | 84 | 188 |
| NAC | 86 | 83 | 169 |
| HBAC | 78 | 58 | 136 |
| NA | 63 | 59 | 122 |
| HAAC | 61 | 55 | 116 |
| NHNAC | 44 | 51 | 95 |
| HAA | 42 | 37 | 79 |
| HNAC | 42 | 32 | 74 |
| HBA | 42 | 31 | 73 |
| NHNA | 33 | 34 | 67 |
| HNA | 30 | 25 | 55 |
• Sonoma County population
58.4 mi, 
219°
• Solano County
64.9 mi, 
165°
• Butte County
47.8 mi, 
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• Yolo County
38.8 mi, 
152°
• Napa County
46.6 mi, 
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• Sutter County
30.2 mi, 
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• Yuba County
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• Lake County
27.9 mi, 
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• Tehama County
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• Glenn County
30.6 mi, 
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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
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