SCF
Sectional Center Facility (SCF) are the first three digits of a zip code. They are used by the United States Postal Service (USPS) to represent an area larger than what a single zip code can encompass
MSA
Metropolitan Statistical Areas (MSA) are cities or urbanized areas within the United States with a population of 50,000 or more.
FSA
Forward Sortation Area (FSA) are the first three digits of a postal code. They are used by the Canada Post to represent an area larger than what a simple code encompasses