The discovery was made on Wednesday in the area of South Keystone Avenue, police said.
A young couple living there noticed a large box on their front porch. Expecting some merchandise that was ordered online, they opened it and found the pot.
The couple called police who responded and confiscated the drugs.
The marijuana was delivered by the postal service.
It was exactly one week earlier that a five pound brick of marijuana with a street value of $20,000 was delivered to a on the first block of Heather Road in Upper Darby.
Police say that delivery had a return address of Tolleson, Arizona and was mailed from Phoenix via UPS. The return address, police say, was fake.
The drugs were wrapped in a styrofoam lining to prevent detection by dogs, police said.
The couple who found the pot declined to talk to the media, fearing retaliation by drug dealers.
Upper Darby Police Superintendent Michael Chitwood says the department sees about a half-dozen similar deliveries a year and can sometimes track down the sender. Previous shipments have included cocaine and heroin.