Who should I address my demonstrated interest letter to?

Step one: don’t go with “To Whom It May Concern.” That phrase retired with dial-up internet. Most colleges have regional admissions officers assigned to specific states or territories, and their names (and emails!) are usually listed right on the admissions website. If you’re from Ohio, for example, find the officer who handles Ohio and write directly to them. This shows you’ve done your homework, and it’s a subtle way of saying “I care enough not to be generic.” It’s also way more personal than blasting out a template. Bonus tip: double-check the spelling of their name. Nothing says “meh” like a misspelled greeting.