Tanjung Selor is a town and an administrative district (kecamatan) which serves as the capital of both the North Kalimantan province in Indonesia, and of the Bulungan Regency. It is among those provincial capitals in Indonesia that as of 2025 does not yet have city status, together with Mamuju in West Sulawesi, Sofifi in North Maluku, Nabire in Central Papua, Wamena in Highland Papua, Salor in South Papua, and Manokwari in West Papua. The district has an area of 677.77 km2 according to the regency official statistics. It had a population of 39,439 at the 2010 Census and 56,569 at the 2020 Census; the official estimate as at mid 2025 was 67,837.