How can I find a scam free data entry company?

They do not advertise for workers on the internet. They use staffing services such as Kelly, AppleOne, Manpower, etc.

So call the local staffing services in your area and see if they have home-based data entry jobs.

@Kraigmo great answer honey. I worked through companies including Office Angels and Reeds Employment and they both great to work for, although none of my positions were home based.