Koidu Town (or Sefadu) is the capital and largest city of the diamond-rich Kono District in the Eastern Province of Sierra Leone. The population of Koidu Town is 124,662[http://www.citypopulation.de/SierraLeone-Cities.html?admid=7258] based on the 2015 Sierra Leone national census. Koidu Town is the fifth largest city in Sierra Leone by population, after Freetown, Kenema, Bo and Makeni. Koidu Town is a major urban, business, commercial and diamond trade center. Koidu Town lies approximately 280 miles east of Freetown, and about 60 miles north of Kenema.