Remove Duplicate Addresses

Hello,

I have 2 issues i am trying to work through, i have a spreadsheet with 3 data sheet tabs, the first issue i have is in Data sheet 1 I have a lot of duplicate addresses, I was wondering if there is a way to filter out the duplicate addresses so that only one of each address is showing.

Issue 2 that i have is a lot more complicated, In data sheet 1 i have a list of medical providers that reimburst at 110% or more, each address on that list needs to get 1 letter mailed to them, but i have to keep track of how many are going to each region, i.e. Columbus, OH region, Cincinnati, OH Region, Toledo, OH Region, and Cleveland, OH region. So what i want to do is create a 3rd data sheet that keeps track of total letters sent by region, but was wondering if it was possible for this info to be automatically transfered from data sheet 1 to data sheet 3. I don't need all the information in data sheet 1 to tranfer to data sheet 3. All i need is for data sheet 3 to read off the City field in data sheet 1, and calculate 1 letter sent to that region. I dont even know if this is possible, but it is way beyond my realm of excel knowledge which isn't much.

Any help would be appreciated. I am trying to attach the spreadsheet, however it isn't allowing me to attach it, i keep getting a database error, when i upload it. It is under the max size limit too. Not sure what's going on.

Thank you,

SETH