[Mick]

At least two championships
SF
NY
LA
Philly
Chicago

Not SF, Oakland. 

Not Philly. Others are correct.

Philadelphia is correct.

A’s 5 while in Philly
Phillies 2
7 baseball

Eagles 4
4 football

Warriors 1 while in Philly
76ers 3 
4 NBA

I have since discarded the article from which I took my original five (it's on the Athletic).

It's actually eight, per Encyclopedia Brittanica:

New York (35 MLB, 9 NFL, 2 NBA)
Boston (18 NBA, 10 MLB, 6 NFL)
Chicago (11 NFL, 6 MLB, 6 NBA)
Los Angeles (12 NBA, 7 MLB, 3 NFL)
Philadelphia (7 MLB, 7 NFL, 5 NBA)
Detroit (4 MLB, 4 NFL, 3 NBA)
Oakland (4 MLB, 4 NBA, 2 NFL)
Miami (3 NBA, 2 MLB, 2 NFL)
If you included the Stanley Cup, you could add Pittsburgh

Professional Sports Championships by City | Winners, Locations, Titles, & Facts | Britannica

[Mick]

At least two championships
SF
NY
LA
Philly
Chicago

Not SF, Oakland. 

Not Philly. Others are correct.

Philadelphia is correct.

A’s 5 while in Philly
Phillies 2
7 baseball

Eagles 4
4 football

Warriors 1 while in Philly
76ers 3 
4 NBA

I have since discarded the article from which I took my original five (it's on the Athletic).

It's actually eight, per Encyclopedia Brittanica:

New York (35 MLB, 9 NFL, 2 NBA)
Boston (18 NBA, 10 MLB, 6 NFL)
Chicago (11 NFL, 6 MLB, 6 NBA)
Los Angeles (12 NBA, 7 MLB, 3 NFL)
Philadelphia (7 MLB, 7 NFL, 5 NBA)
Detroit (4 MLB, 4 NFL, 3 NBA)
Oakland (4 MLB, 4 NBA, 2 NFL)
Miami (3 NBA, 2 MLB, 2 NFL)
If you included the Stanley Cup, you could add Pittsburgh

Professional Sports Championships by City | Winners, Locations, Titles, & Facts | Britannica