OK, you said not (Greater) London. But how about the financial centre; the City of London.
Platforms: 76, when you count the tube, DLR and NR stations.
Population: 7,375
That's 97 people per platform!![]()
There's only one private house within the City of London that has a private garden.
Bit off topic, but I thought you might find it interesting!
Back on Topic, Worcester has a population of 99k with 5 platforms, so about 20k per platform.