I'm curious.
My AO is governed by the Michigan ammended International Residential and Mechanical Codes (IRC and IMC turned MRC and MMC) 2009.
Some areas may still have BOCA and some may have no building department so how 'bout your town folks?

I don't know if most of the country is working with the ICC now or other codes, but it'd be nice to know when I put my inspector hat on and go on one of my code "tirades".

NY, ICC

http://publicecodes.citation.com/st/ny/st/index.htm

I've not researched it but believe ICC to be the most common. Thanks for the reply.

ICC, 2009, with a just a few amendments.  Quarter-million population suburb north of Dallas.

March most jurisdictions adopted 2010 FLorida Building Code...online site has a big ICC banner