Lagos

Capital:
Ikeja

Known for:
Economic powerhouse, population density

Population:
~22 million

Ogun

Capital:
Abeokuta

Known for:
Industry and cross-border trade

Population:
~6.2 million

Oyo

Capital:
Ibadan

Known for:
Agriculture, large landmass

Population:
~8.5 million

Osun

Capital:
Osogbo

Known for:
Culture and heritage

Population:
~5.2 million

Ondo

Capital:
Akure

Known for:
Oil & gas, coastal areas

Population:
~4.7 million

Ekiti

Capital:
Ado-Ekiti

Known for:
Education and agricultural potential

Population:
~3.2 million