USCIS has released an interesting report from its field offices on the processing times and statistics of N-400, Application for Naturalization, filings for the fiscal years 2010 through 2012 (or, October 2011).
Number of N-400 Applications
The report breaks down, for each field office processing N-400 applications, the number of receipts, approvals, denials and pending cases for both military and non-military N-400 filings. The statistics are provided for fiscal years 2010, 2011 and YTD 2012.
Average N-400 Processing Times
The report also provides average processing (or cycle) times for N-400 applications, calculated on a service-wide basis. As of October 2011, the average service-wide processing time for N-400 application was 4.2 months for military N-400 case and 4.9 months for non-military N-400 case.
Please note that these average processing times are calculated on a service-wide basis, taking into account all field offices (including ones with very little load). A more reliable (and accurate) way to obtain specific field office processing times is to check the field office processing times for N-400 cases on USCIS website.