The other answer, while not wrong, doesn’t really answer this question, so:
When you call 911, your service provider looks up the “Emergency Service Number”, which is a regular 10 digit phone number, that connects to the 911 call center physically closest to you. Every area has one of these, and they look up which one is closest to your area based on your billing address or cell tower.
They redirect your call to this 10 digit number, and from there it’ll ring at your local 911 call center.
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