Possible Clues:

• Numbers at end of an American address
• Number on US letters
• Closing part of an address
• Number of letters
• Love 100 lines that's part of Gettysburg address?
• Local energy is a mystery to most people and we don't need to address it here yet
• Compress files of computer commands for part of Gettysburg Address?
• Final part of a US mailing address
• Chapter on love poetry essential for the Washington Post?
• US mail identification symbols