| Official Name: | Green Sea, South Carolina |
| Settlement Type: | Census-designated place |
| Pushpin Map: | South Carolina#USA |
| Pushpin Label: | Green Sea |
| Coordinates: | 34.1264°N -78.9756°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Carolina |
| Subdivision Type2: | County |
| Subdivision Name2: | Horry |
| Area Total Km2: | 4.57 |
| Area Total Sq Mi: | 1.76 |
| Area Land Km2: | 4.57 |
| Area Land Sq Mi: | 1.76 |
| Area Water Km2: | 0.00 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 105 |
| Population Density Km2: | 22.99 |
| Population Density Sq Mi: | 59.52 |
| Elevation Ft: | 78 |
| Timezone: | Eastern |
| Postal Code Type: | ZIP Code |
| Postal Code: | 29545 |
| Area Code: | 843 |
| Blank Name: | FIPS code |
| Blank Info: | 45-30760 |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
Green Sea is an unincorporated community and census-designated place (CDP) in Horry County, South Carolina, United States, near the city of Loris. It was first listed as a CDP in the 2020 census with a population of 105.[2]
The Green Sea post office was established 15 Feb 1870, and after a decade of being discontinued and reestablished multiple times, Richard C. Powell was appointed postmaster 8 Nov 1880, and changed the name to Powellville. The post office remained Powellville until 18 Jun 1902, when the post office changed back to Green Sea.[3]
John P. Derham House, listed on the National Register of Historic Places in 2005, is located in Green Sea.
| White alone (NH) | 64 | 60.95% | |
| Black or African American alone (NH) | 36 | 34.29% | |
| Native American or Alaska Native alone (NH) | 0 | 0.00% | |
| Asian alone (NH) | 0 | 0.00% | |
| Pacific Islander alone (NH) | 0 | 0.00% | |
| Some Other Race alone (NH) | 1 | 0.95% | |
| Mixed Race/Multi-Racial (NH) | 2 | 1.90% | |
| Hispanic or Latino (any race) | 2 | 1.90% | |
| Total | 105 | 100.00% |
Green Sea owns an airport whose FAA LID is S79.[5]
Green Sea has a public library, a branch of the Horry County Memorial Library.[6]