The exact location of your monthly listeners numbers may vary depending on your podcast hosting platform. However, most hosting platforms provide some form of analytics dashboard where you can access this information.
On platforms like Buzzsprout, Libsyn or Spreaker you can find your monthly listeners numbers by accessing the analytics section of your account dashboard. Once you're in the analytics dashboard, you can select the period for which you want to view your data and access detailed information on the number of downloads, plays, and unique listeners for each episode.