Thread Post 1 In this first post I will try to illustrate a suspicion I have; namely, I think that "2X- xx" location codes are indicating a specific location within a city, rather than generally making referencing a particular city. These 2X-X codes, I surmise, are referencing a CIA HQ, embassy or consulate in a given city.    These documents indicate Paris as both 15-4 and 20-4.