Salary expectations: how do you answer? - 23 weeks in

A recruiter asked for my salary expectations on a first call as I look for work as a marketing coordinator. I worked as a marketing coordinator before this. I also do not want to sell myself short. How do you research fairly?

Thanks for writing this out. I went through something close to it 4 months ago, and it got easier once I kept a simple log of every call and form.

I gave a range based on local postings and said I was flexible depending on the whole package. They did not push back.