If asked this question during your interview, your interviewer is curious how pressed you are to land a job and whether they're your first choice. They understand job hunting is a numbers game, but they need you to understand they don't want to hire someone who is just looking for any job. They need assurances that you want to work for them, and they want to know why.

Although you are not obligated to give them a number, honesty is always best when asked this question. Keep an organized folder with every customized resume and cover letter you've submitted to each position you are interviewing for. The interviewer will have something similar for all the applicants they are interviewing. Have tabs separating your notes for each interview with a breakdown of the pro and cons of each employer. Detail, for your eyes only, what each of them offers you and what you offer them. This will make you look like an organized professional who takes all of your prospects seriously. This will market you as a viable candidate and puts a little bit of fire under the hiring manager if they are aware that you are actively looking for a new position and you come across as a viable candidate. Feel free to talk with the interviewer about your search so far, and don't hesitate to let them know that a role with them is at the top of your wishlist.