Hello!

 

I am trying to make a realistic Nassau County Police skin but I can't seem to find the right font for the "Police" and the "Nassau County" letters. Please help me! Thank you.

Kinda looks like a modified Eurosile Bold too me, i could be wrong. http://gyazo.com/14a989a0b32600294d167ecfdbfe196f

They use microstyle bold (microstile?) for the "POLICE" lettering on the sides, and either microstyle or eurostile bold for the "NASSAU COUNTY" lettering on the side and "POLICE" lettering on the hood. In my IRL experience, it can be either, I suppose it depends on what's available at the time they marked em up. 

Also, if you're making NCPD skins for yourself I could save you a bit of time...

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Why don't you open that image in a paint.net type program, highlight the letter you want, cut that clip and then paste it onto the template for editing and re coloring.

It looks like Euro Style Bold font to me bud. I've used it loads

 

http://www.fontpalace.com/font-details/Eurostile+Bold/

https://www.fontyukle.net/en/1,Euro