This link shows all of the phone companies operating in your Rate Center. In theory, any of these companies should be able to port your number from Verizon. Your challenge is to find a VoIP service provider that gets its DIDs in your area from one of these companies and also supports LNP.
If you can't find a VoIP service provider who gets DIDs from XO or Focal (the two most likely sources on the list), you might want to move your Verizon number to a Metro PCS or Verizon Wireless cell phone.