In the ending of Get Out, after Rod shows up in a police car to save the day, Chris asks Rod the following:
Rod: I told you not to go in that house.
Chris: I mean... How did you find me?
Rod: I'm TS motherfucking A. We handle shit. That's what we do. Consider this situation ... fucking handled.
It's a hilarious answer which makes for one of the movie's best moments, but it still doesn't answer the question.
How did Rod find Chris at the end of Get Out?
There are no sourced/concrete answers, so here are some possibilities:
Rod has a friend (friend of a friend) in the FBI or CIA who could track people through the cellphone which Rod used to talk to Chris in previous scenes.
Rod did a simple search based on the name Armitage, which seems to be a popular family, and found the address online. Chris even says:
I'm at the Armitage's house.
When trying to call the police earlier indicating it's a very popular family/house.
Since Rod was taking care of Chris dog, Chris probably left his address in case the dog got sick or something happened with it.
