There are several methods for doing this. You should plan to meet with an advisor in Career Services to develop a strategy for targeting employers that is appropriate for your situation and for the type of job you're looking for. One way to find employers who are hiring in your chosen field is to look through job postings. Employer Directories will not give you information about current job openings, but they will tell you what employers exist in your chosen field and location.
Some directories are general, and some are specialized.
Job Bank books . There's a book available for many different metropolitan areas. Employers and contact information are listed according to industry. National Trade and Professional Associations Directory . Nearly every industry has a professional organization.