EXTENSION AREA, United States Zip Code is 66720. EXTENSION AREA is the state of United States. Here you can get the complete zip code of postal code, pin code detail EXTENSION AREA, United States. Allpincode provied informative information to correctly send your mail, parcel or courier delivered to this particular address of EXTENSION AREA, United States by using ZIP Code 66720.You just need to mention correct Zip code of EXTENSION AREA 66720 to delver your mail to the addrress EXTENSION AREA, United States. You can browse through our website to obtain the EXTENSION AREA, ZIP code, postal code of any place or to locate the address of a specific ZIP code.