Welcome to Lake County’s SmartFile E-Filing System

This system allows you to electronically file most applications related to your property’s assessment, and to change your mailing address. If you have used the system before, please log in using your email and the password you established. A link is provided below to retrieve a forgotten password.

If you need help creating an account or logging in, please contact the Chief County Assessment Office at assessor@lakecountyil.gov or (847) 377-2050. Note that logging in as a one-time "guest" is not allowed for filing a change of mailing address. For that you will need to create an account if you have not done so already.

If you have questions about an assessment, appeal, or exemption filing, please contact the Chief County Assessment Office at assessor@lakecountyil.gov or (847) 377-2050.

If you have questions about filing for a change of mailing address, please contact the Treasurer's Office at treasurer@lakecountyil.gov or (847) 377-2323.