(images were edited to emphasize the lights)
The view from space shows the known urbanized areas in the world of Avatar!
Republic City and the cities of the United Republic is the most urbanized nation as shown in the map. Aunt Wu’s village (as shown by the bright dot) is also a city now. Below is probably Merchant’s Pier where the met the pirates and the Harbor Town in The Storm. Seaport Village is the place where the prisoners from Haru’s village were boarded to the Fire Nation ship.
As you may have noticed Ba Sing Se is a HUGE mega city and if you look closely there’s an illuminated road leading to Chameleon bay. Gaoling, Toph’s hometown also seemed to be urbanized now. Omashu doesn’t show any lights so it’s safe to say it’s preserved its original state.
The Southern Water Tribe’s advancement is also very visible in space but we can observe there’s actually two cities not just one.
The Fire Nation seemed to be still in daytime and the Fire Nation Capital isn’t visible. Su Jin, Piandao’s village got some visible lights as well as Hama’s village, the fire fountain city where Toph gambled, and also the village where Aang enrolled in grade school.
There seemed to be urban settlements in Air Nomad territories and we don’t know anything about them. In general, a lot of urban centers are located near bodies of water, which is realistic.