Last official estimated population of St. Lucie County was 278,268 (year 2014)[1]. This was 0.087% of total US population and 1.4% of total Florida state population. Area of St. Lucie County is 687.8 mi² (=1781.5 km²), in this year population density was 404.55 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), St. Lucie County population in 2026 would be 279,710 [0].
Historical population of St. Lucie County for period 1910-2014 [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

[1910-1920] +6.83 %/yr
[1920-1930] -1.1 %/yr
[1930-1940] +5.34 %/yr
[1940-1950] +5.45 %/yr
[1950-1960] +6.89 %/yr
[1960-1970] +2.61 %/yr
[1970-1980] +5.54 %/yr
[1980-1990] +5.59 %/yr
[1990-2000] +2.52 %/yr
[2000-2005] +4.66 %/yr
[2005-2010] +2.8 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in St. Lucie County? Visit this page: Settlements in St. Lucie County, FL
Population of St. Lucie County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 7724 | 7308 | 15,032 |
| 5 to 9 | 8688 | 8283 | 16,971 |
| 10 to 14 | 9198 | 8471 | 17,669 |
| 15 to 19 | 8624 | 8248 | 16,872 |
| 20 to 24 | 8435 | 7918 | 16,353 |
| 25 to 29 | 8061 | 7941 | 16,002 |
| 30 to 34 | 7683 | 8230 | 15,913 |
| 35 to 39 | 7653 | 8131 | 15,784 |
| 40 to 44 | 8245 | 8931 | 17,176 |
| 45 to 49 | 9117 | 9350 | 18,467 |
| 50 to 54 | 9888 | 10536 | 20,424 |
| 55 to 59 | 9568 | 10581 | 20,149 |
| 60 to 64 | 8691 | 9881 | 18,572 |
| 65 to 69 | 9161 | 10231 | 19,392 |
| 70 to 74 | 7721 | 8592 | 16,313 |
| 75 to 79 | 5954 | 6488 | 12,442 |
| 80 to 84 | 4193 | 4804 | 8,997 |
| 85+ | 3488 | 5012 | 8,500 |
St. Lucie 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 | 116298 | 123614 | 239,912 |
| WAC | 109945 | 113792 | 223,737 |
| WA | 107410 | 111190 | 218,600 |
| NHWAC | 86381 | 90698 | 177,079 |
| NHWA | 84432 | 88758 | 173,190 |
| BAC | 30270 | 32601 | 62,871 |
| NHBAC | 28387 | 30613 | 59,000 |
| BA | 28318 | 30598 | 58,916 |
| NHBA | 26868 | 29111 | 55,979 |
| H | 25794 | 25322 | 51,116 |
| HWAC | 23564 | 23094 | 46,658 |
| HWA | 22978 | 22432 | 45,410 |
| AAC | 3153 | 3898 | 7,051 |
| NHAAC | 2882 | 3645 | 6,527 |
| TOM | 2998 | 3115 | 6,113 |
| AA | 2353 | 3057 | 5,410 |
| NHAA | 2199 | 2933 | 5,132 |
| NHTOM | 2372 | 2397 | 4,769 |
| HBAC | 1883 | 1988 | 3,871 |
| IAC | 1641 | 1697 | 3,338 |
| HBA | 1450 | 1487 | 2,937 |
| NHIAC | 930 | 976 | 1,906 |
| IA | 860 | 836 | 1,696 |
| HIAC | 711 | 721 | 1,432 |
| HTOM | 626 | 718 | 1,344 |
| HIA | 529 | 511 | 1,040 |
| NAC | 386 | 368 | 754 |
| NHIA | 331 | 325 | 656 |
| NHNAC | 286 | 275 | 561 |
| HAAC | 271 | 253 | 524 |
| NA | 153 | 140 | 293 |
| HAA | 154 | 124 | 278 |
| HNAC | 100 | 93 | 193 |
| NHNA | 96 | 90 | 186 |
| HNA | 57 | 50 | 107 |
• Broward County population
82 mi,
181°
• Palm Beach County
50.5 mi,
180°
• Brevard County
65.4 mi,
346°
• Osceola County
63.3 mi,
317°
• Martin County
20.7 mi,
172°
• Indian River County
23.6 mi,
340°
• Highlands County
55.1 mi,
267°
• Okeechobee County
27.2 mi,
270°
• Hendry County
72.6 mi,
216°
• Glades County
54.5 mi,
237°
[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
*Brevard; see also note 1 Florida Notes
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