SAShelp zipcode MSA is only 4 digits

[sas128]

Why is the sashelp.zipcode msa code only 4-digit? but many other places clearly show 5 digits? 

[ChrisNZ]

I am not from the US and know nothing of MSA, but a web search for MSA ZIPCODE 4 DIGITS yields the answer to your question.

[ballardw]

Metropolitan (and Micropolitan similar but different membership) Statistical Area codes are from a different coding system. Just like the FIPS codes that also appear in that data set