Last official estimated population of Dorchester County was 137,555 (year 2014)[1]. This was 0.043% of total US population and 2.8% of total South Carolina state population. Area of Dorchester County is 575.8 mi² (=1491.3 km²), in this year population density was 238.89 p/mi². If population growth rate would be same as in period 2010-2014 (+0.18%/yr), Dorchester County population in 2026 would be 140,599 [0].
Historical population of Dorchester County for period 1900-2014 [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

[1900-1910] +0.94 %/yr
[1910-1920] +0.84 %/yr
[1920-1930] -0.26 %/yr
[1930-1940] +0.5 %/yr
[1940-1950] +1.27 %/yr
[1950-1960] +0.76 %/yr
[1960-1970] +2.84 %/yr
[1970-1980] +6.17 %/yr
[1980-1990] +3.52 %/yr
[1990-2000] +1.5 %/yr
[2000-2005] +3.28 %/yr
[2005-2010] +3.82 %/yr
[2010-2014] +0.18 %/yr
Looking for settlements in Dorchester County? Visit this page: Settlements in Dorchester County, SC
Population of Dorchester County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4863 | 4739 | 9,602 |
| 5 to 9 | 5355 | 5287 | 10,642 |
| 10 to 14 | 5533 | 5525 | 11,058 |
| 15 to 19 | 5196 | 4878 | 10,074 |
| 20 to 24 | 4829 | 4690 | 9,519 |
| 25 to 29 | 5217 | 4961 | 10,178 |
| 30 to 34 | 5003 | 5416 | 10,419 |
| 35 to 39 | 4668 | 5038 | 9,706 |
| 40 to 44 | 5011 | 5411 | 10,422 |
| 45 to 49 | 5196 | 5452 | 10,648 |
| 50 to 54 | 5412 | 5713 | 11,125 |
| 55 to 59 | 4653 | 4913 | 9,566 |
| 60 to 64 | 3777 | 4405 | 8,182 |
| 65 to 69 | 3234 | 3550 | 6,784 |
| 70 to 74 | 2066 | 2335 | 4,401 |
| 75 to 79 | 1284 | 1556 | 2,840 |
| 80 to 84 | 744 | 1015 | 1,759 |
| 85+ | 452 | 1092 | 1,544 |
Dorchester 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 | 68822 | 72395 | 141,217 |
| WAC | 52149 | 53342 | 105,491 |
| WA | 50490 | 51676 | 102,166 |
| NHWAC | 49056 | 50329 | 99,385 |
| NHWA | 47530 | 48809 | 96,339 |
| BAC | 19382 | 21274 | 40,656 |
| NHBAC | 18919 | 20764 | 39,683 |
| BA | 18332 | 20181 | 38,513 |
| NHBA | 17956 | 19776 | 37,732 |
| H | 3671 | 3581 | 7,252 |
| HWAC | 3093 | 3013 | 6,106 |
| HWA | 2960 | 2867 | 5,827 |
| AAC | 1706 | 2165 | 3,871 |
| TOM | 1858 | 1910 | 3,768 |
| NHAAC | 1616 | 2071 | 3,687 |
| NHTOM | 1695 | 1733 | 3,428 |
| AA | 1145 | 1591 | 2,736 |
| NHAA | 1095 | 1542 | 2,637 |
| IAC | 1085 | 1069 | 2,154 |
| NHIAC | 909 | 936 | 1,845 |
| IA | 566 | 506 | 1,072 |
| HBAC | 463 | 510 | 973 |
| NHIA | 459 | 438 | 897 |
| HBA | 376 | 405 | 781 |
| NAC | 192 | 205 | 397 |
| HTOM | 163 | 177 | 340 |
| NHNAC | 162 | 172 | 334 |
| HIAC | 176 | 133 | 309 |
| NA | 102 | 112 | 214 |
| HAAC | 90 | 94 | 184 |
| NHNA | 87 | 97 | 184 |
| HIA | 107 | 68 | 175 |
| HAA | 50 | 49 | 99 |
| HNAC | 30 | 33 | 63 |
| HNA | 15 | 15 | 30 |
• Charleston County population
33.1 mi,
125°
• Berkeley County
27.5 mi,
71°
• Beaufort County
52.7 mi,
198°
• Orangeburg County
33.6 mi,
316°
• Colleton County
22.4 mi,
220°
• Clarendon County
41.7 mi,
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• Williamsburg County
54.7 mi,
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• Hampton County
47.7 mi,
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• Bamberg County
38.4 mi,
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• Calhoun County
46.3 mi,
332°
[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
*Colleton South Carolina Notes
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