Poll Results

Total votes: 1136

Right front pants pocket: 280 (24.6%)
Left front pants pocket: 227 (20.0%)
Right back pants pocket: 168 (14.8%)
Jacket/coat pocket: 136 (12.0%)
Left back pants pocket: 93 (8.2%)
In a handbag: 93 (8.2%)
I don't normally carry one: 76 (6.7%)
In a backpack: 54 (4.8%)
I use a money belt: 5 (0.4%)
Shirt breast pocket: 4 (0.4%)

I'm somewhat surprised. I thought most people carried wallets in their back pockets, not front ones. At least, that's what I notice around where I live. Although I suppose it might be a selection bias because it's easier to see the bulge in people's back pockets than their front ones. For the record, I use my front left pocket.