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It might be hard to direct you without knowing what type of internship you're looking for.
If you're in college, I recommend starting with the school's careers center.
In addition, set up a profile on LikedIn. You can do an advanced search by state and by city and get company listings. If you continue to search, you'll find people who work for the company. So, for a sales internship look for the sales manager, sales director or VP of sales. For marketing, marketing manager, marketing director, etc. You get the idea.
If you reply back, I;ll try to give you better direction.