Last official estimated population of Barnwell County was 22,614 (year 2014)[1]. This was 0.007% of total US population and 0.5% of total South Carolina state population. Area of Barnwell County is 557.3 mi² (=1443.3 km²), in this year population density was 40.58 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Barnwell County population in 2024 would be 22,597 [0].
Historical population of Barnwell County for period 1800-2014 [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
[1800-1810] +5.23 %/yr
[1810-1820] +1.85 %/yr
[1820-1830] +2.69 %/yr
[1830-1840] +1.11 %/yr
[1840-1850] +2.17 %/yr
[1850-1860] +1.45 %/yr
[1860-1870] +1.51 %/yr
[1870-1880] +1.1 %/yr
[1880-1890] +1.13 %/yr
[1890-1900] -2.26 %/yr
[1900-1910] -0.37 %/yr
[1910-1920] -3.86 %/yr
[1920-1930] -0.84 %/yr
[1930-1940] -0.52 %/yr
[1940-1950] -1.53 %/yr
[1950-1960] +0.23 %/yr
[1960-1970] -0.28 %/yr
[1970-1980] +1.47 %/yr
[1980-1990] +0.21 %/yr
[1990-2000] +1.47 %/yr
[2000-2005] -0.45 %/yr
[2005-2010] -0.3 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Barnwell County? Visit this page: Settlements in Barnwell County, SC
Population of Barnwell County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 761 | 772 | 1,533 |
| 5 to 9 | 752 | 733 | 1,485 |
| 10 to 14 | 796 | 781 | 1,577 |
| 15 to 19 | 750 | 695 | 1,445 |
| 20 to 24 | 748 | 697 | 1,445 |
| 25 to 29 | 585 | 621 | 1,206 |
| 30 to 34 | 558 | 643 | 1,201 |
| 35 to 39 | 569 | 648 | 1,217 |
| 40 to 44 | 612 | 674 | 1,286 |
| 45 to 49 | 637 | 730 | 1,367 |
| 50 to 54 | 765 | 859 | 1,624 |
| 55 to 59 | 727 | 899 | 1,626 |
| 60 to 64 | 686 | 763 | 1,449 |
| 65 to 69 | 604 | 650 | 1,254 |
| 70 to 74 | 384 | 507 | 891 |
| 75 to 79 | 235 | 297 | 532 |
| 80 to 84 | 148 | 261 | 409 |
| 85+ | 147 | 265 | 412 |
Barnwell 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 | 10121 | 11285 | 21,406 |
| WAC | 5882 | 6074 | 11,956 |
| WA | 5721 | 5938 | 11,659 |
| NHWAC | 5616 | 5916 | 11,532 |
| NHWA | 5465 | 5785 | 11,250 |
| BAC | 4517 | 5363 | 9,880 |
| NHBAC | 4456 | 5316 | 9,772 |
| BA | 4414 | 5259 | 9,673 |
| NHBA | 4358 | 5215 | 9,573 |
| H | 343 | 210 | 553 |
| HWAC | 266 | 158 | 424 |
| HWA | 256 | 153 | 409 |
| TOM | 178 | 157 | 335 |
| NHTOM | 167 | 152 | 319 |
| IAC | 123 | 115 | 238 |
| AAC | 111 | 97 | 208 |
| NHIAC | 101 | 106 | 207 |
| NHAAC | 108 | 96 | 204 |
| AA | 80 | 78 | 158 |
| NHAA | 80 | 78 | 158 |
| IA | 67 | 62 | 129 |
| HBAC | 61 | 47 | 108 |
| NHIA | 50 | 54 | 104 |
| HBA | 56 | 44 | 100 |
| HIAC | 22 | 9 | 31 |
| HIA | 17 | 8 | 25 |
| NAC | 11 | 9 | 20 |
| NHNAC | 8 | 9 | 17 |
| HTOM | 11 | 5 | 16 |
| NA | 4 | 1 | 5 |
| HAAC | 3 | 1 | 4 |
| HNAC | 3 | 0 | 3 |
| HNA | 3 | 0 | 3 |
| NHNA | 1 | 1 | 2 |
| HAA | 0 | 0 | 0 |
• Lexington County population
44.6 mi, 
12°
• Richmond County
37.6 mi, 
280°
• Aiken County
23.1 mi, 
330°
• Orangeburg County
38.4 mi, 
71°
• Burke County
36.4 mi, 
246°
• Hampton County
37.3 mi, 
153°
• Bamberg County
22.4 mi, 
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• Screven County
37.2 mi, 
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• Allendale County
19.8 mi, 
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• Jenkins County
44.8 mi, 
224°
[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
*Orangeburg South Carolina Notes
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