Based on the latest 2020 data from the US census, the current population of Barnwell is 4,291. Barnwell, South Carolina is the 5,188th largest city in the US.
The peak population of Barnwell was in 1990, when its population was 5,545. In 1990, Barnwell was the 3,781st largest city in the US; now its fallen to the 5,188th largest city in the US. Barnwell is currently 22.6% smaller than it was in 1990.
Barnwell has shrunk 13.5% since the year 2000. Barnwell, South Carolina's growth is extremely below average. 93% of similarly sized cities are growing faster since 2000.
| Year | Population | Rank in US |
|---|---|---|
| 2019 | 4,291 | 5,188 |
| 2018 | 4,367 | 5,121 |
| 2017 | 4,429 | 5,060 |
| 2016 | 4,542 | 4,976 |
| 2015 | 4,592 | 4,941 |
| 2014 | 4,649 | 4,886 |
| 2013 | 4,691 | 4,839 |
| 2012 | 4,680 | 4,824 |
| 2011 | 4,715 | 4,799 |
| 2010 | 4,750 | 4,764 |
| 2009 | 4,733 | 4,734 |
| 2008 | 4,780 | 4,693 |
| 2007 | 4,798 | 4,665 |
| 2006 | 4,798 | 4,641 |
| 2005 | 4,816 | 4,601 |
| 2004 | 4,822 | 4,576 |
| 2003 | 4,871 | 4,513 |
| 2002 | 4,876 | 4,502 |
| 2001 | 4,932 | 4,457 |
| 2000 | 4,965 | 4,425 |
| 1990 | 5,545 | 3,781 |
| US Rank | Name | Population | Growth 2000-2019 |
|---|---|---|---|
| 5178 | Dillon, Montana | 4,301 | 0.9% |
| 5179 | Madeira Beach, Florida | 4,301 | -4.6% |
| 5180 | Hallsville, Texas | 4,296 | 54.0% |
| 5181 | Slaughterville, Oklahoma | 4,296 | 17.8% |
| 5182 | West Reading, Pennsylvania | 4,296 | 4.8% |
| 5183 | Prescott, Wisconsin | 4,295 | 14.5% |
| 5184 | Carlisle, Iowa | 4,294 | 19.6% |
| 5185 | Lamar, Missouri | 4,294 | -3.4% |
| 5186 | La Joya, Texas | 4,293 | 25.9% |
| 5187 | Rigby, Idaho | 4,292 | 40.3% |
| 5188 | Barnwell, South Carolina | 4,291 | -13.5% |
| 5189 | Selmer, Tennessee | 4,291 | -5.1% |
| 5190 | Chatsworth, Georgia | 4,290 | 17.9% |
| 5191 | Geneva, Alabama | 4,289 | -2.8% |
| 5192 | Springville, New York | 4,288 | 0.0% |
| 5193 | Cross Plains, Wisconsin | 4,286 | 38.4% |
| 5194 | Grant-Valkaria, Florida | 4,286 | 44.4% |
| 5195 | Indian Rocks Beach, Florida | 4,285 | -16.6% |
| 5196 | Buena, New Jersey | 4,284 | 10.8% |
| 5197 | Cold Spring, Minnesota | 4,284 | 29.4% |
| 5198 | Osawatomie, Kansas | 4,284 | -9.5% |
| US Rank | Name | Population | Growth 2000-2019 |
|---|---|---|---|
| 3427 | Seneca | 8,533 | 10.6% |
| 3460 | York | 8,412 | 20.1% |
| 3473 | Clinton | 8,380 | -8.2% |
| 3698 | Bennettsville | 7,730 | -18.8% |
| 3722 | Union | 7,640 | -13.1% |
| 3754 | Hartsville | 7,542 | -0.3% |
| 3841 | Hardeeville | 7,278 | 243.9% |
| 3862 | Camden | 7,220 | 7.8% |
| 4092 | Clover | 6,519 | 61.5% |
| 4102 | Lake City | 6,497 | 0.3% |
| 4174 | Marion | 6,326 | -10.1% |
| 4180 | Dillon | 6,311 | -2.9% |
| 4302 | Darlington | 5,940 | -12.5% |
| 4464 | Cheraw | 5,562 | -0.3% |
| 4521 | Walterboro | 5,426 | 1.1% |
| 4530 | Batesburg-Leesville | 5,415 | -2.2% |
| 4549 | Central | 5,385 | 46.6% |
| 4551 | Chester | 5,377 | -16.7% |
| 4572 | Travelers Rest | 5,346 | 31.3% |
| 4627 | Hollywood | 5,227 | 25.5% |
| 4738 | Abbeville | 5,014 | -14.6% |
| 4862 | Edgefield | 4,810 | 8.5% |
| 5026 | Surfside Beach | 4,525 | 1.9% |
| 5059 | Walhalla | 4,472 | 17.3% |
| 5071 | Belton | 4,455 | -0.4% |
| 5097 | Woodruff | 4,418 | 3.6% |
| 5141 | Isle of Palms | 4,360 | -4.7% |
| 5188 | Barnwell | 4,291 | -13.5% |
| 5221 | Williamston | 4,260 | 11.9% |
| 5235 | Mullins | 4,239 | -15.5% |
| 5283 | Blythewood | 4,150 | 383.6% |
| 5475 | Manning | 3,892 | -3.1% |
| 5519 | Honea Path | 3,826 | 8.0% |
| 5534 | Ridgeland | 3,811 | 45.6% |
| 5598 | Lyman | 3,718 | 32.0% |
| 5665 | Duncan | 3,626 | 21.9% |
| 5685 | Saluda | 3,605 | 17.0% |
| 5951 | Pendleton | 3,285 | 9.9% |
| 6046 | Bamberg | 3,189 | -14.2% |
| 6059 | Winnsboro | 3,181 | -16.6% |
| 6072 | Pickens | 3,170 | 4.2% |
| 6091 | Liberty | 3,154 | 4.7% |
| 6174 | Kingstree | 3,063 | -14.9% |
| 6226 | Bishopville | 3,017 | -17.8% |
| 6306 | Denmark | 2,934 | -11.4% |
| 6313 | Williston | 2,925 | -10.9% |
| 6314 | Allendale | 2,924 | -27.9% |
| 6379 | Andrews | 2,859 | -6.8% |
| 6487 | Loris | 2,761 | 32.6% |
| 6503 | Burnettown | 2,747 | 4.6% |
| 6521 | Springdale | 2,733 | 3.2% |
| 6541 | Ravenel | 2,720 | 16.1% |
| 6548 | Wellford | 2,718 | 12.1% |
| 6602 | Landrum | 2,677 | 7.5% |
| 6632 | Folly Beach | 2,660 | 21.5% |
| 6660 | Pageland | 2,636 | 4.6% |
| 6702 | Westminster | 2,591 | -5.6% |
| 6767 | Pacolet | 2,550 | -6.8% |
| 6793 | Lincolnville | 2,529 | 174.2% |
| 6812 | Hampton | 2,505 | -11.5% |
| 6835 | South Congaree | 2,484 | 8.5% |
| 6912 | Inman | 2,430 | 20.3% |
| 6931 | Cowpens | 2,419 | 5.9% |
| 6977 | Johnston | 2,381 | -0.4% |
| 7004 | Pine Ridge | 2,366 | 35.0% |
| 7005 | Timmonsville | 2,366 | 2.2% |
| 7029 | McCormick | 2,352 | -11.6% |
| 7076 | Kershaw | 2,321 | 42.5% |
| 7254 | St. George | 2,202 | 6.2% |
| 7270 | Blackville | 2,189 | -26.2% |
| 7322 | Ware Shoals | 2,154 | -9.1% |
| 7325 | New Ellenton | 2,151 | -4.4% |
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