Best Practice Cities ( C )

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A (7) | B (9) | C (8) | D (3) | E (2) | F (2) | G (7) | H (4) | I (1) | J (1) | K (2) | L (6) | M (12) | N (2) | O (1) | P (7) | R (3) | S (16) | T (10) | V (2) | W (1) | Y (1) | Z (1)

Chicago, is the third-most populous city in the United States. With over 2.7 million residents, it is also the most populous city in both the state of Illinois and the Midwestern United States.  The Chicago metropolitan area, often referred to as Chicagoland, has nearly 10 million people and is the third-largest in the United States.

Chicago has often been called a global architecture capital and is considered one of the most important business centers in the world.

Cixi is a county-level city under the jurisdiction of the sub-provincial city of Ningbo, Zhejiang. At the 2010 census, its population was 1,462,383. Its urban agglomeration built-up (or metro) area, largely contiguous with Cixi plus the county-level city of Yuyao, had 2,473,042 inhabitants.

Cixi is an important manufacturing city in northern Zhejiang province.

Cologne is the largest city in the German federal State of North Rhine-Westphalia and the fourth most populated city (1,060,582 inhabitants by 2015) in Germany (after Berlin, Hamburg, and Munich). It is located within the Rhine-Ruhr metropolitan region which is Germany's largest and one of Europe's major metropolitan areas with a population of 3,573,500.

Copenhagen is the capital and most populous city of Denmark. The city has a population of 775,033 (as of January 2018), of whom 613,288 live in the Municipality of Copenhagen. The larger urban area has a population of approximately 1.3 million (as of 1 January 2016) within the Capital Region of Denmark, while the Copenhagen metropolitan area has over 2 million inhabitants.

Copenhagen is situated on the eastern coast of the island of Zealand and is separated from Malmö, Sweden, by the strait of Øresund. The Øresund Bridge connects the two cities by rail and road.

Cork is a university city in southwest Ireland, in the province of Munster, which had a population of 125,622 in 2016. The city is situated on the River Lee, which splits into two channels at the western end and divides the city centre into islands. Population in the larger metropolitan area was about 400,000 in the 2011 census.

Cork City is a hub of industry in the province. Several pharmaceutical companies have significant operations in the area, including Pfizer Inc., Johnson & Johnson and Swiss company Novartis.

Coventry is a city and metropolitan borough in the West Midlands, England. It is the second largest city in the West Midlands region, after Birmingham, with a population of 345,385 in 2015.

Coventry has been a centre of motor and cycle manufacturing from 1896. Coventry motor companies have contributed significantly to the British motor industry.

Curitiba is the capital and largest city of the Brazilian state of Paraná. The city sits on a plateau at 932 metres (3,058 ft) above sea level. Curitiba's population numbered approximately 1,879,355 people as of 2015, and the had a total population of over 3.2 million (estimate 2010).

Curitiba is an important cultural, political, and economic centre in Latin America. The city receives more than two million tourists every year. 

Cyberjaya is a town with a science park as the core that forms a key part of the Multimedia Super Corridor in Malaysia. It is located in Sepang District, Selangor. Cyberjaya is adjacent to, and developed along with Putrajaya, Malaysia's new seat of government. The day-time population in Cyberjaya is about 83,000 and the current population is expected to increase to 100,000 by end of 2016 with the robust developments taking place. Cyberjaya's population is expected to increase to 210,000 by 2020.