Most earned from a settlement

[Hooahguy]

1,000,000,000 in Bartixia.

[Olaf The Great]

6,000 in Kart-Hadast
Of course this is with about 3 heavily armed armies across the world.

[d'Arthez]

I don't have an exact figure, but at some point Dalminion made me about 9,000 Mnai / turn, after paying for upkeep etc, in a Roman campaign.

It helped that huge mines were built, a governor was present, and naval trade does wonders as well. :D

[mp0925]

the most ive ever made is 5000 :(
when ever my towns go past minor city and get swamped by huge upkeep things

[Centurio Nixalsverdrus]

10,500+ in Athenai

[Warmaster Horus]

Easily over 10000, and I think it was Dalminion or Athens. Probably Athens, seeing the numbers the others have.

[General Appo]

14,000 in Dalminion. 7,000 mining, another 7,000 trading. This with my huge Roman Empire and all buildings completed.

[fatsweets]

As the Seleukids in Sardis I am currently bringing in 7200 per turn. Didn't know Sardis was such a big money maker until now.