

| Number of IDPs | 500,000-several million (Nigerian Government, 2006) 200,000 as of November 2004 (U.N. Humanitarian Appeal for West Africa, 2005) Undetermined (IDMC, 2007) |
| POPULATION/ETHNIC MIX | |
| Total population | 141.4 million (UNDP, Human Development Report 2007/8) |
| Population under age 15 | 44.3 percent of total, 2005 (UNDP, Human Development Report 2007/8) |
| Number of ethnic groups | About 250 |
| Largest ethnic groups (percentage of total population) | Hausa/Fulani (29 percent - mainly in the north) Yoruba (21 percent - mainly in the southwest) Igbo (18 percent - mainly in the southeast) Ijaw (10 percent - mainly in the Niger Delta) (UNDP) |
| INCOME POVERTY AND INEQUALITY | |
| Population living on less than $1 a day | 70.8 percent (1990-2004 average) (UNDP, Human Development Report 2007/8) |
| Share of income/expenditure, poorest 10 percent | 1.9 percent (2003) (UNDP, Human Development Report 2007/8) |
| Share of income/expenditure, richest 10 percent | 33.2 percent (2003) (UNDP, Human Development Report 2007/8) |
| CORRUPTION | |
| Transparency International ranking (1=least corrupt, 179=most corrupt) | 2007: 147 (joint) 2006: 142 (joint) 2005: 152 (joint) Transparency International, 2007) |