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 based on the 2015 Sierra Leone 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 270 miles east of Freetown, and about 54 miles north of Kenema. Two of the world’s ten largest and most famous rough diamonds were found in the Woyie River that flows through Koidu Town.The city is officially known as Koidu City. The mayor of Koidu City and members of the Koidu-New Sembehun city council are directly elected every four years by the residents of Koidu. The current mayor of Koidu Town is Komba Sam of the Coalition 4 Change political party. Komba Sam was narrowly elected mayor of Koidu Town with 49.5% of the votes in the 2018 Koidu Mayoral election over his closest rival of the Sierra Leone People's Party . Koidu is one of the most ethnically and religiously diverse cities in Sierra Leone. The city is inhabited by significant numbers of many of Sierra Leone's ethnic groups, with no single ethnic group forming a majority. Most of the foreign diamond workers in Kono District reside in the city. The Krio language is by far the most widely spoken language in Koidu Town and is the primary language of communication in the city.
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