Acens  Sugerida por Miastar 
Eurostile Candy  Sugerida por Sherlocat 
Downlink  Sugerida por Sherlocat 

I've used Acens as a similar font.

See here:
I made this custom album cover for songs that I bought as singles after hearing them in different episodes of this show. They were all getting lost on my iPod so I customized the details and created this cover. Note: I only added "The Album" as I used an original image from the show.

Hey - I think the correct font for the PERSON OF INTEREST logo is Eurostile Candy Regular! (Make sure to use 'i' not 'y' in the word 'Eurostile')

However, the Eurostile Candy font is an extremely expensive commercial font. So I'd like to recommend a pretty similar free font, called Downlink.

Please note that the free use of the Downlink font is for personal use only.

Yikes - it looks like this forum does not allow the posting of links to free font sites?? Even if the font is legitimately free.

Anyway, you can Google for the Downlink font. It was created by Neale Davidson of PixelSagas website. It's free for personal use. If you want to use Downlink for commercial use, you can purchase the licence for only $20 USD on his website.

Hope that helps out my fellow POI fans!