The ZIP code of Marietta, GA is 30066.What is the value of the check sum digit CSD in the USPS bar code?

Name: The ZIP code of Marietta, GA is 30066.What is the value of the check sum digit CSD in the USPS bar code?
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[ \mathrm { CSD } + ext { ZIP code sum } ] _ { \bmod ( 10 ) } = [ ext { CSD } + 15 ] _ { \bmod ( 10 ) } = 0 ightarrow C S D = 5

The ZIP Code of Marietta, GA Is 30066