Strong's #4172: polis (pronounced pol'-is)
 probably from the same as 4171, or perhaps from 4183; a town (properly, with walls, of greater or less size):--city.
Thayer's Greek Lexicon:
 ́ 
 
  polis 
 
 1) a city
 
 1a) one' s native city, the city in which one lives
 1b) the heavenly Jerusalem
 
 1b1) the abode of the blessed in heaven
 1b2) of the visible capital in the heavenly kingdom, to come down to earth after the renovation of the world by fire
 
 1c) the inhabitants of a city
 
  Part of Speech: noun feminine
Relation: probably from the same as 4171, or perhaps from G4183
  Citing in TDNT: 6:516, 906
 
Usage:
This word is used 165 times:
Revelation 18:19: "Alas, alas, that great  city, wherein were made rich all"
Revelation 18:21: "Thus with violence shall that great  city Babylon be thrown down, and shall be found"
Revelation 20:9: "compassed the camp of the saints about, and the beloved  city:"
Revelation 21:2: "saw the holy  city, new Jerusalem, coming down from"
Revelation 21:10: "and showed me that great  city, the holy Jerusalem,"
Revelation 21:14: "the wall of the  city had twelve foundations, and"
Revelation 21:15: "to measure the  city, and the gates thereof,"
Revelation 21:16: "And the  city lieth foursquare, and the length"
Revelation 21:16: "breadth: and he measured the  city with the reed, twelve"
Revelation 21:18: "of jasper: and the  city was pure gold, like unto clear"
Revelation 21:19: "of the wall of the  city were garnished with all manner of precious stones."
Revelation 21:21: "pearl: and the street of the  city was pure gold,"
Revelation 21:23: "And the  city had no need of the sun,"
Revelation 22:14: "gates into the  city."
Revelation 22:19: "out of the holy  city, and from the things which are written in this"