Halloween is a blast for kids, but parents need to make sure they're safe. After all, you don't know who's behind that door when you knock on it to trick or treat.

Missoula has about 325 sex offenders living in town, and I'm sure any parent would want to avoid them at all costs. Luckily, this map exists that shows you the residence of every sex offender in Missoula. It's a good tool to reference - these are the houses and apartments that you're going to want to skip this Halloween.