2013 Anual Flow Report
see the latest naturalization statistics from DHS
Naturalization buffs will find interesting data in the latest Anual Flow Report here: http://www.dhs.gov/publication/us-naturalizations-2013
For example, there's information on rates of naturalization by continent of origin (would you have guessed that Africans are the quickest to naturalize--with a median number of years in permanent residence status of only 5 years?), or by metropolitan area of residence (would you have guessed that more immigrants by far become naturalized citizens in the NY/NJ/PA area than any other metropolitan area? Or that the state with the highest number of naturalizations is California?).
There's data on naturalizations for country of origin, age, and state of residence, and more. Check it out.