Lake County, IllinoisProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Assessment appeal
- September 30, 2026 for filing instant assessments or assessment increases for the 2026 property-tax year; ordinary township appeal deadlines are notice-specific.
Exemptions & appeals
View exemption application (opens in a new tab)Senior relief
Lake County provides a 2026 online Low-Income Senior Citizens Assessment Freeze application workflow and states that the CCAO/Board of Review administers current senior relief; the filing date is tied to the applicable notice.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →