The National Health Commission said in its daily bulletin that five of the local transmissions took place in Tianjin and two in Shanghai.
Tianjin, which neighbors the capital Beijing, will launch a three-day universal screening program covering nearly 3 million of its residents on Saturday.
Local officials said on Friday that one community in Tianjin had been placed in lockdown and around 1,900 people have been quarantined, according to the China Daily newspaper.
Mainland China also reported another 18 cases of asymptomatic cases on Nov. 20, up from 14 on the previous day.
It has so far reported an accumulated total of 86,414 COVID-19 cases, with the official death toll at 4,634.