While the national unemployment rate is 4.7 percent, the jobless rate for HR professionals is less than half of that: 2.2 percent. The low rate is the result of an10 percent increase in HR-related positions in 2016.

HR professionals are also making decent money. Even those on the low end of the pay scale in the field are doing better than average American workers. Randstad provides the following salary range based on job classification:

• HR generalist: $62,826 to $75,339

• HR manager: $99,884 to $121,227

• Compensation and benefits manager: $108,161 to $131,274

• Learning and development specialist: $44,200 to $85,540

• Recruitment specialist: $62,581 to $75,954

The study also profiles the top markets for HR employment, some of which are likely to surprise. While larger metropolitan areas tend to have greater job opportunities, Randstad says a number of smaller markets that have a high number of open HR positions, including Reno, Nev., Harrisburg, Pa., Trenton, N.J., and Anchorage, Alaska.

Related: HR professionals feel secure in their jobs, study says

Randstad's optimism about the future of HR is echoed by similar findings by the Bureau of Labor Statistics in recent years.

In 2015, the BLS projected that the number of HR managers would grow by 9 percent over the next decade, at a faster clip than other jobs. The same analysis found that the median salary for an HR manager was $104,440.