Last official estimated population of Polk County was 603,359 (year 2014)[1]. This was 0.189% of total US population and 3% of total Florida state population. Area of Polk County is 2,010.5 mi² (=5207.1 km²), in this year population density was 300.11 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Polk County population in 2026 would be 607,167 [0].
Historical population of Polk 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] +0.04 %/yr
[1880-1890] +9.53 %/yr
[1890-1900] +4.67 %/yr
[1900-1910] +6.83 %/yr
[1910-1920] +4.82 %/yr
[1920-1930] +6.46 %/yr
[1930-1940] +1.83 %/yr
[1940-1950] +3.65 %/yr
[1950-1960] +4.64 %/yr
[1960-1970] +1.53 %/yr
[1970-1980] +3.54 %/yr
[1980-1990] +2.34 %/yr
[1990-2000] +1.79 %/yr
[2000-2005] +2.5 %/yr
[2005-2010] +1.92 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Polk County? Visit this page: Settlements in Polk County, FL
Population of Polk County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 19075 | 18172 | 37,247 |
| 5 to 9 | 21094 | 19911 | 41,005 |
| 10 to 14 | 21187 | 20482 | 41,669 |
| 15 to 19 | 20555 | 19359 | 39,914 |
| 20 to 24 | 20499 | 19958 | 40,457 |
| 25 to 29 | 19560 | 19614 | 39,174 |
| 30 to 34 | 19061 | 19547 | 38,608 |
| 35 to 39 | 17761 | 18302 | 36,063 |
| 40 to 44 | 18990 | 19413 | 38,403 |
| 45 to 49 | 19306 | 19164 | 38,470 |
| 50 to 54 | 20291 | 21136 | 41,427 |
| 55 to 59 | 19222 | 20824 | 40,046 |
| 60 to 64 | 17631 | 20703 | 38,334 |
| 65 to 69 | 17803 | 20647 | 38,450 |
| 70 to 74 | 14932 | 16874 | 31,806 |
| 75 to 79 | 11183 | 12351 | 23,534 |
| 80 to 84 | 7082 | 8468 | 15,550 |
| 85+ | 5784 | 8697 | 14,481 |
Polk 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 | 253990 | 263194 | 517,184 |
| NH | 247420 | 262661 | 510,081 |
| WA | 248313 | 257422 | 505,735 |
| NHWAC | 195636 | 207238 | 402,874 |
| NHWA | 191463 | 202843 | 394,306 |
| H | 63596 | 60961 | 124,557 |
| HWAC | 58354 | 55956 | 114,310 |
| HWA | 56850 | 54579 | 111,429 |
| BAC | 52457 | 55023 | 107,480 |
| BA | 48584 | 51090 | 99,674 |
| NHBAC | 47829 | 50578 | 98,407 |
| NHBA | 45011 | 47616 | 92,627 |
| AAC | 6816 | 7891 | 14,707 |
| NHAAC | 6345 | 7409 | 13,754 |
| TOM | 6260 | 6395 | 12,655 |
| AA | 5442 | 6441 | 11,883 |
| NHAA | 5213 | 6187 | 11,400 |
| NHTOM | 4680 | 4948 | 9,628 |
| HBAC | 4628 | 4445 | 9,073 |
| IAC | 3805 | 3754 | 7,559 |
| HBA | 3573 | 3474 | 7,047 |
| NHIAC | 2138 | 2275 | 4,413 |
| IA | 2027 | 1914 | 3,941 |
| HIAC | 1667 | 1479 | 3,146 |
| HTOM | 1580 | 1447 | 3,027 |
| HIA | 1146 | 1019 | 2,165 |
| NHIA | 881 | 895 | 1,776 |
| NAC | 737 | 700 | 1,437 |
| HAAC | 471 | 482 | 953 |
| NHNAC | 445 | 462 | 907 |
| NA | 390 | 360 | 750 |
| HNAC | 292 | 238 | 530 |
| HAA | 229 | 254 | 483 |
| HNA | 218 | 188 | 406 |
| NHNA | 172 | 172 | 344 |
• Hillsborough County population
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52.6 mi,
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34.5 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
*Hillsborough, Brevard Florida Notes
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