Uncovering the Largest City in Africa: Population Statistics of Lagos Nigeria We weren’t able to create a summary for you. Refresh your page to try again. [17][18] Lagos was the national capital of Nigeria ... [17][18] Lagos was the national capital of Nigeria ... Lagos is a megacity located in Nigeria, in the Lagos State region. According to the latest available data (2026), the population of Lagos is approximately 15,070,000 residents , making it the largest city in Nigeria. Lagos is a megacity located in Nigeria, in the Lagos State region. According to the latest available data (2026), the population of Lagos is approximately 15,070,000 residents , making it the largest city in Nigeria.