What is the area code of Chongqing?

Area code refers to the telephone area code commonly used in the administrative areas of major cities in the world, which is mainly used for domestic and international long-distance telephone access. For example, Chinese mainland international area code 86, Beijing area code 10, Shanghai area code 2 1, etc.

At that time, there was no program-controlled telephone exchange and there were not many municipal administrative units. When the local unit exceeds 10 but is less than 15, some areas with less long-distance telecom business share a regional switching center.

For example, Huaihua City in Hunan Province, Xiangxi Tujia and Miao Autonomous Prefecture in Hunan Province and Zhangjiajie City in Hunan Province share a regional exchange center with neighboring Chenzhou and Loudi cities in Hunan Province, so the area code is 4. However, the long-distance network also adopts the "multilevel tandem system".

In the 1990s, computer-controlled program-controlled switches were widely used in China. This multi-stage tandem system for long-distance calls became a thing of the past, and local telephone networks could communicate without going through the next tandem center. However, the area code format of that year was retained. Later, the C4 network merged, and the four-digit area code was gone.

In this way, the three-digit area code with the second even number will obtain the number resources, ensuring that each municipal administrative unit has at least one three-digit area code.

Introduction to Chongqing:

Located in the southwest of China, Chongqing is the center of economy, finance, science and technology, shipping and commercial logistics in the upper reaches of the Yangtze River. It is the only four-type logistics hub in China, an international consumption center city, an important strategic fulcrum for the development of the western region, an important connection point between the Belt and Road and the Yangtze River Economic Belt, and an inland open highland. It has cultural landscapes such as Dazu Stone Carving in Nanchuan, Wulong Karst and Jinfo Mountain.

Chongqing is located in the southwest of China, on the upper reaches of the Yangtze River, with a land span of1051'~10/1'and a latitude of 28 10' ~ 32 60'. It borders Hubei and Hunan in the east, Guizhou in the south, Sichuan in the west and Shaanxi in the north. The area under its jurisdiction is 470 kilometers long from east to west and 450 kilometers wide from north to south, covering an area of 82,400 square kilometers.