Last official estimated population of St. Johns County was 191,257 (year 2014)[1]. This was 0.06% of total US population and 0.9% of total Florida state population. Area of St. Johns County is 821.5 mi² (=2127.7 km²), in this year population density was 232.81 p/mi². If population growth rate would be same as in period 2010-2014 (+0.16%/yr), St. Johns County population in 2026 would be 194,958 [0].
Historical population of St. Johns County for period 1830-2014 [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

[1830-1840] +0.6 %/yr
[1840-1850] -0.65 %/yr
[1850-1860] +1.87 %/yr
[1860-1870] -1.48 %/yr
[1870-1880] +5.65 %/yr
[1880-1890] +6.75 %/yr
[1890-1900] +0.51 %/yr
[1900-1910] +3.72 %/yr
[1910-1920] -0.11 %/yr
[1920-1930] +3.64 %/yr
[1930-1940] +0.69 %/yr
[1940-1950] +2.25 %/yr
[1950-1960] +1.85 %/yr
[1960-1970] +0.23 %/yr
[1970-1980] +5.26 %/yr
[1980-1990] +5.03 %/yr
[1990-2000] +3.93 %/yr
[2000-2005] +5.4 %/yr
[2005-2010] +3.47 %/yr
[2010-2014] +0.16 %/yr
Looking for settlements in St. Johns County? Visit this page: Settlements in St. Johns County, FL
Population of St. Johns County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 5299 | 5151 | 10,450 |
| 5 to 9 | 6802 | 6613 | 13,415 |
| 10 to 14 | 7565 | 7341 | 14,906 |
| 15 to 19 | 7421 | 6948 | 14,369 |
| 20 to 24 | 5813 | 5616 | 11,429 |
| 25 to 29 | 5285 | 5536 | 10,821 |
| 30 to 34 | 5631 | 6040 | 11,671 |
| 35 to 39 | 6098 | 6444 | 12,542 |
| 40 to 44 | 7350 | 7746 | 15,096 |
| 45 to 49 | 7595 | 8065 | 15,660 |
| 50 to 54 | 8116 | 8956 | 17,072 |
| 55 to 59 | 7691 | 8244 | 15,935 |
| 60 to 64 | 7067 | 7933 | 15,000 |
| 65 to 69 | 6807 | 7213 | 14,020 |
| 70 to 74 | 4805 | 5082 | 9,887 |
| 75 to 79 | 2931 | 3348 | 6,279 |
| 80 to 84 | 2058 | 2347 | 4,405 |
| 85+ | 1829 | 3133 | 4,962 |
St. Johns 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 |
| NH | 99565 | 105007 | 204,572 |
| WAC | 96796 | 101897 | 198,693 |
| WA | 94916 | 100071 | 194,987 |
| NHWAC | 90651 | 95616 | 186,267 |
| NHWA | 89009 | 94003 | 183,012 |
| BAC | 6870 | 7048 | 13,918 |
| H | 6598 | 6749 | 13,347 |
| NHBAC | 6477 | 6643 | 13,120 |
| HWAC | 6145 | 6281 | 12,426 |
| BA | 6081 | 6274 | 12,355 |
| HWA | 5907 | 6068 | 11,975 |
| NHBA | 5822 | 5989 | 11,811 |
| AAC | 3497 | 3852 | 7,349 |
| NHAAC | 3363 | 3723 | 7,086 |
| AA | 2662 | 3011 | 5,673 |
| NHAA | 2596 | 2946 | 5,542 |
| TOM | 2005 | 1971 | 3,976 |
| NHTOM | 1750 | 1736 | 3,486 |
| IAC | 911 | 862 | 1,773 |
| NHIAC | 739 | 700 | 1,439 |
| HBAC | 393 | 405 | 798 |
| IA | 398 | 352 | 750 |
| NHIA | 301 | 268 | 569 |
| HBA | 259 | 285 | 544 |
| HTOM | 255 | 235 | 490 |
| NAC | 201 | 165 | 366 |
| HIAC | 172 | 162 | 334 |
| NHNAC | 168 | 142 | 310 |
| HAAC | 134 | 129 | 263 |
| HIA | 97 | 84 | 181 |
| NA | 101 | 77 | 178 |
| NHNA | 87 | 65 | 152 |
| HAA | 66 | 65 | 131 |
| HNAC | 33 | 23 | 56 |
| HNA | 14 | 12 | 26 |
• Duval County population
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332°
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59.1 mi,
166°
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61.9 mi,
219°
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60.2 mi,
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• Clay County
29.6 mi,
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• Flagler County
29.3 mi,
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• Putnam County
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• Bradford County
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• Union 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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