The employer needs to know the complete address of the employee for a number of reasons. One is for payroll purposes. Setting up an account for a person requires him to provide his address. Another reason is that if something wrong happens, they would know where to locate him or his family. The company also needs an employees address so that they can be certain of his identity. And another reason would be for mailing of anything necessary purposes.
Every form is intended to serve some purpose. Your first step is to identify the purpose, i.e., what you will be using the form for. Decide whether it will be used for official or personal use, whether you need to embed logos in it, whether the printable form will need to filter any data from the company software etc. Once you have identified the function the printable form is expected to perform, you can easily decide which software or online program you need to create the form.