City Types

Type 	Population 	Strength
Rural 	2 to 50,000 	Very low
Superrural 	70,000 to 99,999 	Very low
Suburban 	100,000 to 500,000	Low
Super-Suburban 	500,001 to 1M 	Low
Urban 	1M to 1.99B 	Medium
Metropolis 	2B to 500B 	High
Megalopolis 	501B to 5T 	Very High
Super-Megalopolis	5.1T+ 	Extreme
Type 	Meaning
Terrestrial 	on land, is on something and has access to air, not submerged or floating
Aquatic 	underwater or underliquid
Flying 	in the air
Non-Terrestrial	off planet but in the close vicinity
Capital 	can be interused with other types, is just lead city of planet