State/Region
char(2)
For US/Canada, ISO-3166-2 code for the state/province name, with the addition of AA, AE, and AP for Armed Forces America, Europe and Pacific. Outside of the US and Canada, FIPS 10-4 code. Region name lookups are available in selected APIs
Region code is sometime returned as an integer?
From http://www.maxmind.com/app/city, region should be char(2)...