[citation needed] Koidu Town is a major urban, business, commercial and diamond trade center.

Two of the world's ten largest and most famous rough diamonds were found in the Woyie River that flows through Koidu Town.

Under it Sierra Leone's military government gave the concession to operate the Koidu diamond mine to the firm in payment for helping to suppress the Revolutionary United Front rebels in the area during the country's civil war.

In 2003 the government transferred rights, duties, and responsibilities from Branch Energy to Koidu Holdings, a company owned by Octea of the BSGR Resources group, for $28 million.

[9] He was suspended by the national government in 2016, following the release of the Panama Papers and the publication of an article quoting him complaining about the diamond mine's operation and failure to pay taxes.

[8] Koidu Town is one of Sierra Leone's six municipalities and is governed by a directly elected city council, headed by a mayor, in whom executive authority is vested.

[citation needed] American aid workers helped rebuild the Koidu Government Hospital, which has improved the previously alarming health situation in the town.

Various other aid organizations, including the UN Refugee Agency, UNHCR and its partners, have helped drill wells, re-build clinics and schools and regenerate livelihoods in the area, as part of a programme to support the reintegration of Sierra Leoneans who returned after living for several years as refugees in neighbouring countries.

A professional football club, Diamond Stars F.C., is based in Koidu Town and represents the Kono District in the Sierra Leone National Premier League.