Excel with adress data must be checked for double-entries and new adress data must be added to the file. Those will be given from letter-heads, visit-cards etc. (scans).
29 freelancers are bidding on average $331 for this job
I used to do this work for my former boss and other clients all the time. I worked on sorting thousands of contact details for our email marketing efforts and for importing to our Salesforce database.