| Project Name | KEK Sei Mangkei |
| Developer Name | PT. Perkebunan Nusantara III (PTPN III) |
| Year of Completion | 2012 |
| Total Landbank (Ha) | N/A |
| Primary Industry | Palm oil and rubber |
| Website | kek.go.id/kawasan/Sei-Mangkei |
| City | Simalungun |
| Province | North Sumatera |
| Population | 1.021.615 in Kabupaten Simalungun (2022) |
| People Density | 222/km2 |
| Regional Minimum Wage (UMR) | IDR 2.800.790 in Kabupaten Simalungun (2023) |
