A question like that can't be answered, first, without 1) having a previous bill to go from and 2) know what kind of habits you have in regards to power usage. Sometimes as new homeowners, we don't know what's normal for the new home, especially if we just left something either smaller, gas utilities for some of the appliances, or from home with the parents. Your first winter power bill may knock you clean out your seat. Trust me, I seen it happen(laughing).
1) for duplex and apartments, your neighbor may be using your circuit
2) for the single home unit, the meter may be damage, it's very unlikely, but possible.
At any rate, get a license electrician over to confirm this and write up a statement to that effect. Then inform power company of damaged meter. While license electrician are on site, he can check for power leakage test, energy cost usage and audit as well.