How do you find people fast & free?

I was in second grade, and it was bad I guess, but it got worse, because that was that was the last time I seen my dad, I am now in 8th grade. I have no clue where he lives, not even the state, i have no number, or no way of contacting him at all. Can you pleaseee help me ?! I need a site where you can get information on people, like where they live and phone number etc etc but the site has to be free !

Thank you for all the help !

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