The most urbanized part of Nigeria is the South/West region. This region comprises of states such as Lagos, Ogun, Oyo, Osun, Ekiti, and Ondo. Lagos is the most populous and economically significant city in Nigeria, and it is also the country's commercial hub. It has a population of over 20 million people, and it is a major center of business, trade, and finance.
The South/West region is home to several other large cities, including Ibadan, Abeokuta, Ado-Ekiti, Akure, and Osogbo, which are all important economic and cultural centers in their own right. This region is known for its high population density, industrialization, and urbanization, which have contributed to its rapid growth and development.
Overall, the South/West region of Nigeria is the most urbanized because it has the highest concentration of large cities and urban centers, which have attracted a significant influx of people seeking better economic opportunities, education, and social amenities.