It seems what you would need is a spreadsheet with the first line having the categories and then each row containing a person's information.  If done right you can import any number of addresses.  Example would be:
	
	
	
		
The USPS program's address book format for CSV is like this:
Full Name,Company,Address 1,Address 2,Address 3,City,State,Zip Code,Province,Country,Urbanization,Phone,Fax,E Mail,Customer Ref #,Short Name
Joe Customer,ABC Co.,480 L'Enfant Pl. SW,,,Washington,DC,20024,,United States,,2022222222,,icustomercare@usps.com,,ABCCO
	
		
			
		
		
	
			
			
		Code:
	
	Name   Address   City  State   Zip
Abra   123 Cad   Abra  AL       12345
etc    234 etc   etc   TX       23456Full Name,Company,Address 1,Address 2,Address 3,City,State,Zip Code,Province,Country,Urbanization,Phone,Fax,E Mail,Customer Ref #,Short Name
Joe Customer,ABC Co.,480 L'Enfant Pl. SW,,,Washington,DC,20024,,United States,,2022222222,,icustomercare@usps.com,,ABCCO
 
				
		 
 
		 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		