There are some good suggestions upthread.
Check animal control and the local shelters, especially if they have a short kill time.
Put up flyers and ask neighbors. If it's cold, someone may have taken the cat in.
Post on Craigslist lost and found board.
If possible, get a humane trap and set it with a favorite or really smelly food. You might catch other animals first.
I've read that cats don't stray far. My Buddy took off from his previous family. They are five houses down.
Some cities have FB pages that post missing pets. I see one for Erie pop up on my FB page all the time.
Med/Coarse, porous curly.