Teachers.io attempts to capture each teacher's geographic location (latitude and longitude). Teachers.io either uses the geolocation of the school the teacher teaches at or a geolocation the teacher agrees to provide.
The geolocation is used to filter and sort content appropriately based on the teacher's location. For example, when a student searches for John Smith, there can be many teachers with that name. Having a geolocation allows the list of teachers to come back with those closest to the student sorted first, making it easier for the student to join their class. Teachers.io does not show the teacher's actual geolocation anywhere on their public profile nor in the myHomework apps.