Where to look?

[Aquaexploder]

So normally when I look for queens I just take a walk around my neighborhood and look at the edge of the road where it meets people's yards. Recently I haven't found any using this method. Any suggestions on where else I can look?

[JackPayne]

I do footpaths and carparks.

[ultraex2]

Are there any woods around or do you know anyone that has a pool?
Rather than focusing on queens, make sure you keep track of where actual ant colonies are since they will eventually have nuptial flights.

[Batspiderfish]

Cemeteries and recreational parks work well in this way, too.

[Phoenix]

Banks, Easily By Far; Though I'm Not Too Certain, Whether This Tactic Performs As Well On American Soil.
But It Is Worth Giving A Try - Note: Acquire Formal Permission Before Doing So!