i feel like we had this thread already, but below is a list of states with high concentration of nigerians. but nigerians are everywhere.
Areas of Concentrated Residence
The USA has the world's third largest Nigerian community, only behind Nigeria itself and the United Kingdom, where almost half a million Nigerians reside. Like other successful immigrant populations in the United States, Nigerian Americans reside in virtually all 50 states. Sizeable communities are concentrated in the following areas:
1. Maryland: Prince Georges, Baltimore and Montgomery counties
2. New York: All boroughs of New York City, Nassau and Westchester counties
3. Texas: Harris, Fort Bend, Tarrant, Dallas counties
4. Georgia: Cobb, Dekalb, Fulton, Gwinnett counties
5. New Jersey: Hudson, Essex, Bergen, Union and Middlesex counties
6. Illinois: Cook County
7. California: Alameda, Los Angeles, San Bernardino, Orange, San Diego, Sacramento, Contra Costa counties and the San Francisco Bay Area
8. Ohio: Hamilton and Montgomery counties
9. Rhode Island: Providence County
http://en.wikipedia.org/wiki/Nigerian_American#Areas_of_Concentrated_Residence