I cannot emphasise enough - don't try to squeeze into your sneakers or have an inch spare either way. It's going to lead to pain, injury and on a lesser scale, blisters and callouses.

By request, here is a list of trainers tried and tested for wide feet. If you have no idea if you pronate (turn inwards), supinate (roll outwards), have wide or narrow feet, I recommend getting measured and fitted properly by a reputable footwear store.
The following models are perfect for daily running, providing shock absorption and good fit for wide feet:

Asics Gel Cumulus 15