Downtown Philadephia
Philadelphia is often discussed here in this section, but not its City Center specifically. I used a 29 census tract definition, roughky the area between South St., Spring Garden St. and the two rivers.
-------------------- 2020 ------ 2010 ------ 2000 ------ 1990
City Center --------- 91,510 ----- 68,836 ----- 57,552 ----- 51,302 ----- 32.9% --- 19.6% --- 12.2%
Philadelphia ----- 1,603,797 -- 1,526,006 -- 1,517,550 -- 1,585,577 ---- 5.1% ---- 0.6% --- -4.3%
The area has
8.92 km² and a density of
10,300 inh./km². Growth has been insane, with population almost doubling in the past 20 years. It's even more impressive as the area is pretty much built up for ages.
For comparison, Chicago Loop & Near North Side (posted above), with a much higher profile, is not so far ahead, with 148k inh. in a 10.7 km² area. Or Downtown LA, often discussed, with 74k inh. in a 14.9 km² area.
P.S. Guys, to convert the area and density to sq miles, just multiply by 2.59