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This is a difficult question to answer because there are many variables to what constitutes a city. If you give a specific population (such as 1,000,000 or more), you can get a straight answer.  Here is what WIKIPEDIA has to say about "city"

A city is a relatively large and permanent settlement.[1][2] Although there is no agreement on how a city is distinguished from a town within general English language meanings, many cities have a particular administrative, legal, or historical status based on local law.
For example, in the American state of Massachusetts an article of incorporation approved by the local state legislature distinguishes a city government from a town. In the United Kingdom and parts of the Commonwealth of Nations, a city is usually a settlement with a royal charter.[1] Historically, in Europe, a city was understood[citation needed] by some to mean an urban settlement with a cathedral. The belief in this distinction is also common in England, where the presence of a cathedral is thought by many to distinguish a 'city' (sometimes called a 'cathedral city') from a 'town' (which has a parish church[citation needed]); the belief is incorrect (Chelmsford, for example, became a city only in 2012, but had a cathedral for most of the 20th century).
Cities generally have complex systems for sanitation, utilities, land usage, housing, and transportation. The concentration of development greatly facilitates interaction between people and businesses, benefiting both parties in the process. A big city or metropolis usually has associated suburbs and exurbs. Such cities are usually associated with metropolitan areas and urban areas, creating numerous business commuters traveling to urban centers for employment. Once a city expands far enough to reach another city, this region can be deemed a conurbation or megalopolis.

Sorry I can't give you the exact answer you seek.  Perhaps another member can be more specific.