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This question already has an answer here:

I have a sorted field that I would like to populate with sequential numbers. They are not in order of OID.

Is there any way to do this?

marked as duplicate by PolyGeo arcgis-desktop Feb 1 '17 at 23:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.