Trying to create a marketing list targeted at contacts, based off of a list of accounts?

Hi everyone, 

Basically I need to create a marketing list for our contacts from one particular territory, so I am trying to create a marketing list (targeted at contacts) based on all of the accounts located in that territory. 

I am very new to Dynamics, but I did something similar I'm sure a few months ago...I just I can't remember how. I just need a way to pull contacts from all accounts from that particular territory. I have both a marketing list and an account view which do this already at the account level - is there some way to use these to pull the contacts into their own list?

I am extremely grateful for any and all help!