Last official estimated population of San Luis Obispo County was 269,860 (year 2014)[1]. This was 0.085% of total US population and 0.7% of total California state population. Area of San Luis Obispo County is 3,615.5 mi² (=9364.1 km²), in this year population density was 74.64 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), San Luis Obispo County population in 2025 would be 270,474 [0].
Historical population of San Luis Obispo 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] +18.16 %/yr
[1860-1870] +10.35 %/yr
[1870-1880] +6.72 %/yr
[1880-1890] +5.8 %/yr
[1890-1900] +0.35 %/yr
[1900-1910] +1.54 %/yr
[1910-1920] +1.23 %/yr
[1920-1930] +3.07 %/yr
[1930-1940] +1.16 %/yr
[1940-1950] +4.46 %/yr
[1950-1960] +4.66 %/yr
[1960-1970] +2.69 %/yr
[1970-1980] +3.93 %/yr
[1980-1990] +3.4 %/yr
[1990-2000] +1.29 %/yr
[2000-2005] +0.94 %/yr
[2005-2010] +0.84 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in San Luis Obispo County? Visit this page: Settlements in San Luis Obispo County, CA
Population of San Luis Obispo County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 6971 | 6519 | 13,490 |
| 5 to 9 | 7196 | 6957 | 14,153 |
| 10 to 14 | 7167 | 6895 | 14,062 |
| 15 to 19 | 11406 | 10570 | 21,976 |
| 20 to 24 | 17205 | 13546 | 30,751 |
| 25 to 29 | 8617 | 7210 | 15,827 |
| 30 to 34 | 8902 | 7846 | 16,748 |
| 35 to 39 | 7930 | 6828 | 14,758 |
| 40 to 44 | 7905 | 6904 | 14,809 |
| 45 to 49 | 8204 | 7344 | 15,548 |
| 50 to 54 | 9235 | 9296 | 18,531 |
| 55 to 59 | 9479 | 10518 | 19,997 |
| 60 to 64 | 9414 | 10042 | 19,456 |
| 65 to 69 | 8078 | 8364 | 16,442 |
| 70 to 74 | 5454 | 6075 | 11,529 |
| 75 to 79 | 3590 | 4307 | 7,897 |
| 80 to 84 | 2660 | 3312 | 5,972 |
| 85+ | 2719 | 4418 | 7,137 |
San Luis Obispo 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 | 129635 | 127520 | 257,155 |
| WA | 125126 | 123251 | 248,377 |
| NH | 109860 | 107702 | 217,562 |
| NHWAC | 99734 | 100586 | 200,320 |
| NHWA | 96423 | 97539 | 193,962 |
| H | 32272 | 29249 | 61,521 |
| HWAC | 29901 | 26934 | 56,835 |
| HWA | 28703 | 25712 | 54,415 |
| AAC | 7624 | 7464 | 15,088 |
| NHAAC | 6736 | 6548 | 13,284 |
| AA | 5336 | 5370 | 10,706 |
| NHAA | 4849 | 4856 | 9,705 |
| TOM | 4860 | 4613 | 9,473 |
| BAC | 5524 | 2443 | 7,967 |
| IAC | 3811 | 3786 | 7,597 |
| NHTOM | 3554 | 3273 | 6,827 |
| NHBAC | 4820 | 1777 | 6,597 |
| BA | 4542 | 1506 | 6,048 |
| NHBA | 4069 | 1090 | 5,159 |
| HIAC | 1990 | 2004 | 3,994 |
| IA | 1951 | 1931 | 3,882 |
| NHIAC | 1821 | 1782 | 3,603 |
| HTOM | 1306 | 1340 | 2,646 |
| HIA | 1212 | 1202 | 2,414 |
| HAAC | 888 | 916 | 1,804 |
| NHIA | 739 | 729 | 1,468 |
| NAC | 721 | 658 | 1,379 |
| HBAC | 704 | 666 | 1,370 |
| NHNAC | 538 | 501 | 1,039 |
| HAA | 487 | 514 | 1,001 |
| HBA | 473 | 416 | 889 |
| NA | 317 | 280 | 597 |
| NHNA | 226 | 215 | 441 |
| HNAC | 183 | 157 | 340 |
| HNA | 91 | 65 | 156 |
• Fresno County population
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96.8 mi, 
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102.9 mi, 
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• Tulare County
110.1 mi, 
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• Santa Barbara County
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• Monterey County
76.5 mi, 
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• Kings County
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• Madera County
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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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