The LEHD program of the Census Bureau publishes crosswalks which map every Census Block to a number of other geography types, including ZCTA and CBSA.
You could download one of these crosswalks, filter out just the columns for ZCTA and CBSA, and then take the unique rows -- then for each ZCTA, you would see which CBSA it is in. Note, however, that a few ...
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What is the best way to determine the concrete subset percentage [of
TIV students] used for a given measure? Is it a "cohort" column, like
Number of students in the family income cohort?
For some metrics ...