Despite being the smallest and least well-known, county-level cities make up more than half of the cities in China. County-level cities are also the lowest rung of the ladder when it comes to city status in China, each being governed by a "parent" prefecture-level city. This leads to a common cause of confusion when it comes to Chinese addresses as a Chinese address can contain the names of 2 cities, which is not something most people can easily make sense of!
In total, there are 348 county-level cities in China.