Salary expectations/ negotiation

I am interviewing at a well know environmental nonprofit that is based out of northern California for a Partnership Coordinator position where I would be managing and maintaining large special project operations with government organizations. I am about to complete my master's degree and I also have professional experience in the career field. With that being said, I am completely stumped on what my salary expectations should be. I know the post is general, but I was seeing if anyone has any general estimates. I don't want to go into the interview without a number in my head. I have looked on Glassdoor and related sites but haven't been able to find anything useful/ comparable.

Any insight is appreciated.

submitted by /u/Morgangiskahn
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