There are several ways to find an interior designer:
Personal reference is always an excellent method. You may have admired an interior designer's work at a friend's home.
Seeing the interior designer's work in a magazine or showcase house.
Referral services: The American Society of Interior Designers (ASID) offers toll-free referral services for residential design projects and for commercial design projects. Many design centers around the country also offer referral services.
Your local phone book. Be sure to ask for references.
Try Google.com
Once you have a few names, call each design professional to set up an interview. Some interior designers charge for this; most do not. Some like to meet you at your home; others like to conduct interviews in their own offices. An interview is an opportunity for you to get to know the interior designer and for him or her to get a feel for your design project. Ask to see the designer's portfolio. Remember, however, that your job may be different than anything in the designer's portfolio. Don't expect to love every room; they were designed for clients whose requirements may be very different than yours. If every room is similar, however, be sure that you like the look. A well-trained, experienced interior designer should be able to work in several styles and with various budgets.