Dynamic content

I’m trying to add dynamic content on a few landing pages for our PPC campaign. For example, if someone from Irvine California landed on our page, I’d like the copy to say “We represent homeowners in Irvine like you” instead of a generic copy that says “We represent homeowners in California like you”.

I know there are plugins like If So that does this, but is there any organic solutions within the Enfold theme that supports something like this? Or is there a simple PHP code I can add to the child theme that will enable this function without a plugin?

Thank you so much!