They get an average post-social distancing salary of VND10.1 million ($435.82) a month, 11 percent more than the next group, factory workers (VND9.1 million), according to recruitment platform Viec Lam Tot.
Their salary also increased the most in March -- 11.2 percent -- indicating high demand as delivery companies competed to hire drivers.
Salesclerks had an average salary of VND8.1 million per month this year, followed by security guards (VND7.1 million) and hotel and restaurant staff (VND6.7 million).
Viec Lam Tot said there is a shortage of delivery staff as e-commerce demand remains high.
E-commerce had grown by over 20 percent last year, according to the Vietnam E-commerce Association.
Nguyen Hoang Trung, CEO of delivery app Loship, said people have picked up the habit of ordering things online.
An average delivery person could make VND400,000-600,000 a day if they work for eight hours, and some work for up to 18 hours, he added.
The report also said the highest salary for drivers is paid in the southern province of Binh Duong at VND11.72 million, followed by Dong Nai Province (VND11.6 million) and HCMC (VND9.78 million).
Factory workers, waiters and salesclerks in the two provinces also get higher salaries than their counterparts in HCMC.
The exodus of over 500,000 workers from HCMC to their hometowns at the end of last year partly explain these figures, the report said, citing data from the General Statistics Office.