Cincy, Cinci, Cinti., or Nati?!

So I posted a question via the social media channels of "Cincy or Cinci"?! After surveying my community, here are the results.

For mailing purposes = Cinti.,if you have a roadrunner outlook email address = Cinci, if you're in the 'cool' crowd utilize = Nati, but for regular description & slang = Cincy!

What do you utilize?
Cincy
Cinci
Nati
Cinti.