In the book of Ezekiel, the Prophecy of New Jerusalem (or City (where) God (is) there (יְהוָה שָׁמָּה, Jehovah-shammah), also titled Heavenly Jerusalem, in the Book of Revelation as well as Zion in other books of the Bible) is Ezekiel's prophetic vision of a city to be established to the south of the Temple Mount that will be inhabited by the twelve tribes of Israel in the Messianic era. Total area would be 4,950,625 km2 (1,911,447 sq mi) as measured.
Size of New Jerusalem
“The angel who talked with me had a measuring rod of gold to measure the city, its gates and its walls. The city was laid out like a square, as long as it was wide. He measured the city with the rod and found it to be 12,000 stadia (about 1,400 miles or 2,200 kilometers) in length, and as wide and high as it is long. He measured its wall and it was 144 cubits (about 200 feet (about 65 meters) thick, by man’s measurement, which the angel was using.” (Revelation 19:15-17)
How large is the city? That varies slightly depending on the version of the Bible. The ESV and NIV versions say it is 12,000 stadia in length and width(Rev. 21:16), where a stadia is 607 feet. This translates to 1,400 miles, which is what the NLT Bible says. However, the KJV and other versions say 12,000 furlongs, which translates to 1,500 miles.
Regardless of whether the city is 1,400 miles or 1,500 miles in length and width, it is shaped like a square at the base. This means New Jerusalem is larger than India with nearly 2 million square miles. These measurements are meant to be literal since they are described as man's measurements (Rev. 21:17).
Even more astounding than the size at the base is the height that is also at least 1,400 miles (Rev. 21:16). This goes well beyond Earth's atmosphere and into space. If a building in the city is this high and has a generous 12 feet per story, the building would be over 600,000 stories!
To give you a better idea just how big New Jerusalem is, here are some representations of what it would look like on Earth if the city is shaped like a cube over North America: