Abstract: This disclosure relates to systems and methods for determining information associated with a user. In certain embodiments, various attributes, interest, and/or other demographic information related to a user may be determined based on information may be obtained from personal electronic devices associated with the user. User attribute models used to predict user attributes and/or demographics may be generated and trained based on inferred user interests and available label data. In some embodiments, information reflecting which applications and/or types of applications are installed and/or frequently used by a user on their personal electronic devices may be used in connection with determining interests associated with the user. Further embodiments of the systems and methods disclosed herein relate to determining various information associated with a user based on location information indicative of a user's location obtained from one or more personal electronic devices associated with the user.