What does service center depend on?

So I was wondering how service centers get picked to process different forms.

Does it have anything to do with physical proximity of the petitioner to the service center?

My fiancée lives in Alaska but idk if that would change anything

submitted by /u/Spuffy19
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source https://www.reddit.com/r/immigration/comments/qug6c3/what_does_service_center_depend_on/