How do you see how many people live within a certain drive time distance away from a ZIP code centroid?

[marleeakerson]

I am trying to find how many people (from a dataset) live within 30 minutes of driving from the centroid of a ZIP code. 

[JohnPlunkett]

Do you have access to ArcGIS Online?

If you do you could use the Enrich Layer tool in the analysis tools - this does consume ArcGIS Online credits so you need the correct user role/ privillages

This should give you a result you are after.