Brendan,
You should be able to see the wires coming out of your meter. If you follow them, they should lead to a circuit breaker within the meter box. You should be able to access your meter.
Based on your average usage numbers, looks like you got hit by the "double billing bug" that people are talking about. at 1500-2000 per month, I don't think you'll find any freeloaders on your meter. In my first house after moving here, I found a couple of street lights and a couple of people who connected their AC to my meter. It took me a few months to realize I was being billed way too much but one bill really drove the point home - $RD 17,000.00 that month. I got that fixed pronto.