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In addition, set up a free profile on LinkedIn.com
This will let you identify businesses and people by job title who you can go to directly to inquire about a marketing internship.
Depending where you live, professional sports teams including minor league teams, employ a number of marketing interns each season.
Best of Luck
The best way to find any internship is to go out and look for it. You may want to begin with your college or university for information. Contact any marketing or sales firms in your area, talk to human resources, and let them know that you are looking for an internship. I would also contact any medium or large business which have a separate marketing department to offer your services as an intern. Good luck!