Cook County Property Taxes
Property taxes in Cook County are proportional to assessed property values. Therefore, a higher assessed property value means a higher tax bill. In an effort to estimate fair market prices, the Assessor re-estimates a property's value once every 3 years (each year 1/3 of Cook County properties are reassessed).
By law, the assessed value of every property in Cook County may be appealed each year even though the Assessor re-values only 1/3 of them.
If a property's assessed value is successfully appealed during a reassessment year, this means that the property owner will save money for 3 straight years.
Townships
Cook County has 38 townships. Property taxes can be appealed only during specific times:
| Township | Appeals Opened | Appeals Closed |
|---|---|---|
| River Forest | 4/21/2021 | 5/21/2021 |
| Riverside | 4/22/2021 | 5/22/2021 |
| Evanston | 5/7/2021 | 6/7/2021 |
| Oak Park | 5/17/2021 | 6/16/2021 |
| Norwood Park | 5/17/2021 | 6/16/2021 |
| Berwyn | 6/01/2021 | 7/01/2021 |
| New Trier | 6/01/2021 | 7/01/2021 |
| Cicero | 6/08/2021 | 7/09/2021 |
| Rogers Park | 6/11/2021 | 7/13/2021 |
| Palatine | 6/14/2021 | 7/16/2021 |
| Schaumburg | 6/16/2021 | 7/19/2021 |
| Elk Grove | 6/28/2021 | 7/29/2021 |
| Calumet | 7/02/2021 | 8/03/2021 |
| Orland | 7/02/2021 | 8/03/2021 |
| Hanover | 7/14/2021 | 8/16/2021 |
| Barrington | 7/14/2021 | 8/16/2021 |
| West Chicago | 7/21/2021 | 8/23/2021 |
| Bloom | 7/23/2021 | 8/23/2021 |
| Maine | 7/23/2021 | 8/23/2021 |
| Thornton | 8/09/2021 | 9/09/2021 |
| Palos | 8/12/2021 | 9/13/2021 |
| Lemont | 8/14/2021 | 9/14/2021 |
| Jefferson | 8/16/2021 | 9/16/2021 |
| Worth | 8/24/2021 | 9/24/2021 |
| Leyden | 8/30/2021 | 9/30/2021 |
| Northfield | 9/03/2021 | 10/04/2021 |
| Bremen | 9/15/2021 | 10/18/2021 |
| North Chicago | 9/17/2021 | 10/19/2021 |
| Lyons | 9/21/2021 | 10/25/2021 |
| South Chicago | 9/30/2021 | 11/01/2021 |
| Wheeling | 10/05/2021 | 11/05/2021 |
| Proviso | 10/08/2021 | 11/08/2021 |
| Stickney | 10/14/2021 | 11/29/2021 |
| Rich | 10/26/2021 | 11/29/2021 |
| Niles | 11/01/2021 | 12/03/2021 |
| Lake | 11/04/2021 | 12/06/2021 |
| Lake View | 11/22/2021 | 12/23/2021 |
| Hyde Park | 12/15/2021 | 01/23/2022 |