Nevermind...
The population limit works a bit different than AoE and AoK. In AoM, you can increase your pop cap in three ways.
Houses boost your pop cap by 10, but you can only have 10 houses.
Town Centers boost your pop cap by 15, but you can only build Town Centers on settlements, and you can only have one Town Center until you reach the third age.
Researching the City Center upgrade in the third age increases the population supported by your Town Centers to 20.
This makes a maximum pop cap of 115 until the third age - and then the highest population goes to whoever can take the most settlements! Even if you could capture an insanely large amount of settlements though, your pop cap can never go above 300. In addition to the population cap, units in AoM take up different amounts of population slots. A villager takes up a single pop slot, but a Hoplite or other basic soldiers would take up two. Tough soldiers like cavalry, heroes and myth units take up even more.
[This message has been edited by God of War (edited 09-27-2002 @ 12:25 PM).]