On Windows, right-click your files and select Send to > Compressed (zipped) folder . On Mac, right-click and choose Compress .
For business mailings to specific ZIP codes, you might look into Every Door Direct Mail (EDDM) . USPS: Welcome A Hzip
You can send digital media (like a USB drive containing your ZIP file) via USPS Priority Mail . On Windows, right-click your files and select Send