The postal data for the US contains the following records for Flagstaff, Arizona, USA. I believe the latitude/longitude for postals 86002, 86003, and 86011 are incorrect, identifying a position about 65 km northwest of Flagstaff.
Code:
US 86001 Flagstaff Arizona AZ Coconino 005 35.1859 -111.662
US 86002 Flagstaff Arizona AZ Coconino 005 35.6308 -112.0524
US 86003 Flagstaff Arizona AZ Coconino 005 35.6308 -112.0524
US 86004 Flagstaff Arizona AZ Coconino 005 35.2257 -111.5741
US 86005 Flagstaff Arizona AZ Coconino 005 35.1545 -111.6789
US 86011 Flagstaff Arizona AZ Coconino 005 35.6308 -112.0524