Last official estimated population of San Juan County was 15,757 (year 2014)[1]. This was 0.005% of total US population and 0.2% of total Washington state population. Area of San Juan County is 621.1 mi² (=1608.5 km²), in this year population density was 25.37 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), San Juan County population in 2024 would be 15,727 [0].
Historical population of San Juan 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] +5.52 %/yr
[1880-1890] +8.13 %/yr
[1890-1900] +3.52 %/yr
[1900-1910] +2.1 %/yr
[1910-1920] +0.01 %/yr
[1920-1930] -1.51 %/yr
[1930-1940] +0.19 %/yr
[1940-1950] +0.28 %/yr
[1950-1960] -1.21 %/yr
[1960-1970] +2.99 %/yr
[1970-1980] +7.35 %/yr
[1980-1990] +2.5 %/yr
[1990-2000] +3.42 %/yr
[2000-2005] +1.54 %/yr
[2005-2010] +0.78 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in San Juan County? Visit this page: Settlements in San Juan County, WA
Population of San Juan County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 220 | 257 | 477 |
| 5 to 9 | 310 | 314 | 624 |
| 10 to 14 | 337 | 342 | 679 |
| 15 to 19 | 375 | 368 | 743 |
| 20 to 24 | 299 | 307 | 606 |
| 25 to 29 | 274 | 321 | 595 |
| 30 to 34 | 321 | 339 | 660 |
| 35 to 39 | 336 | 359 | 695 |
| 40 to 44 | 375 | 392 | 767 |
| 45 to 49 | 428 | 454 | 882 |
| 50 to 54 | 592 | 640 | 1,232 |
| 55 to 59 | 706 | 826 | 1,532 |
| 60 to 64 | 831 | 983 | 1,814 |
| 65 to 69 | 878 | 930 | 1,808 |
| 70 to 74 | 650 | 586 | 1,236 |
| 75 to 79 | 363 | 367 | 730 |
| 80 to 84 | 220 | 214 | 434 |
| 85+ | 182 | 319 | 501 |
San Juan 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 | 7467 | 8042 | 15,509 |
| WA | 7269 | 7860 | 15,129 |
| NH | 7230 | 7847 | 15,077 |
| NHWAC | 7055 | 7598 | 14,653 |
| NHWA | 6878 | 7439 | 14,317 |
| H | 467 | 471 | 938 |
| HWAC | 412 | 444 | 856 |
| HWA | 391 | 421 | 812 |
| TOM | 208 | 189 | 397 |
| IAC | 191 | 174 | 365 |
| NHTOM | 183 | 164 | 347 |
| AAC | 132 | 199 | 331 |
| NHAAC | 121 | 189 | 310 |
| NHIAC | 144 | 145 | 289 |
| AA | 83 | 155 | 238 |
| NHAA | 78 | 152 | 230 |
| BAC | 100 | 71 | 171 |
| NHBAC | 81 | 61 | 142 |
| IA | 76 | 61 | 137 |
| BA | 55 | 41 | 96 |
| NHIA | 42 | 46 | 88 |
| NHBA | 45 | 35 | 80 |
| HIAC | 47 | 29 | 76 |
| HTOM | 25 | 25 | 50 |
| HIA | 34 | 15 | 49 |
| NAC | 17 | 24 | 41 |
| NHNAC | 14 | 21 | 35 |
| HBAC | 19 | 10 | 29 |
| HAAC | 11 | 10 | 21 |
| NA | 6 | 12 | 18 |
| HBA | 10 | 6 | 16 |
| NHNA | 4 | 11 | 15 |
| HAA | 5 | 3 | 8 |
| HNAC | 3 | 3 | 6 |
| HNA | 2 | 1 | 3 |
• King County population
91.5 mi, 
140°
• Snohomish County
69 mi, 
116°
• Kitsap County
63.5 mi, 
160°
• Whatcom County
62.3 mi, 
68°
• Skagit County
59 mi, 
90°
• Island County
31.2 mi, 140°
• Grays Harbor County
101.9 mi, 
199°
• Clallam County
45.3 mi, 
232°
• Mason County
79.7 mi, 
182°
• Jefferson County
52.3 mi, 201°
[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
See note 2 Washington Notes
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