This post has been significantly update – see here:

According to your Conform-o-meter, to boost your Obedience rating you need to have public buildings to keep your people docile! Now, this makes it quite challenging to improve at lower levels, as most of the public buildings you need unlock at later stages of the game.

So, what are the public buildings? Well, they’re the buildings that have piles of cash above them and include:
– the School
– the Library
– the Church
– the Police Station
– the Town Hall
– the Post Office
– the Hospital

… apparently, Android’s Dungeon and the Wiggum House!

But that’s not the full story. Like all the other elements of your conformity bonus, the Obedience rating seems to drop when there’s a new level or when you expand your land area. And, by level 24, you’ve completely run out of public buildings.

Fortunately, you can also improve your Obedience rating by putting up signs – and planting lots of the Stop Sign ($385 and unlocking at level 22) and the Hail Ants Sign ($450 and unlocking at level 23) can give it a significant boost. Exactly how many you need, however, will depend very much on the size of your town.