Pittsburgh, despite having a big working-class white contingent, only had nine precincts Trump won in 2020.* All of these are in the southern reaches of the city, which is the whitest and most conservative.
One in the furthest south portion of Banksville, which is
a very suburban area. Trump won this area by around 4%.
Two out of the three precincts of
Overbrook, an outer-ring neighborhood. Both went Trump by around 10%.
This is also a fairly suburban area.
The remainder are entirely within the "31st Ward." A weird semi exclave of Pittsburgh, technically cut off from the remainder of the city save for a link over the Glenwood Bridge to Hazelwood. This area includes:
Hays - a weird, nearly dead rural neighborhood with only a few hundred residents.
New Homestead - which is an odd mix of
a small, half black/half white rural neighborhood (which is the sole D precinct and Gates Manor, a little bit of suburb in the city which isn't even connected to the city road grid and
has its own McMansion development (most right-wing part of the city by far - cop neighborhood).
The last and largest is Lincoln Place, basically a suburb that agreed to be annexed by the city around a century ago because the suburb it was within (West Mifflin) wouldn't build them an elementary school, while Pittsburgh would. The neighborhood became known for virulent racism to the point that still around 15 years ago, when an African immigrant closed on a house there, someone in the neighborhood burned it down before he could move in.
Lovely place.
*note, PA is a "tiny precinct" state. All of these had 300-900 voters.