Yes - there are companies that will act as your human resource department even if you are just a mom and pop or very small business. Typically they take care of your payroll from time sheets you provide. The other benefit items such as health insurance, retirement plans, workers compensation etc. are set up as menu items - meaning you can choose from a variety of benefits that you wish to offer your employees as well as how much if any, the cost is shared with the employee. Fees averagge 1% - 2% of payroll.
My recommended source for this type service is TriNet