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Cook County property tax appeals: quick answers

Updated October 20, 2026. Deadlines from the Cook County Assessor and Board of Review calendars. Numbers from the Assessor’s open data. See the full table by township.

The basics

Is it free to appeal property taxes in Cook County?
Yes. Filing an appeal with the Cook County Assessor and with the Cook County Board of Review is free. Both accept appeals online.
Do I need a lawyer to appeal my Cook County property taxes?
No. Homeowners can file for themselves. Many attorneys and appeal firms charge a share of the savings; filing yourself costs nothing.
What is the difference between the Assessor and the Board of Review?
Each township gets two chances a year. First the Cook County Assessor reviews appeals for a few weeks after it mails assessment notices. Later the Cook County Board of Review opens its own window. You can appeal at the Board of Review even if you did not appeal with the Assessor.
How do I know if my home is assessed too high?
Compare it with similar homes nearby: same neighborhood, class, size and age. If yours is assessed higher per square foot than most of them, or above what similar homes recently sold for, that is the evidence the county asks for. Morganwell's free check does this comparison from the county's own records.
What happens after I file with the Assessor?
You get an email confirming the filing and one with your docket number. The decision comes by mail. If it is not enough, you can appeal again at the Board of Review.
Can condo owners appeal?
Yes. For a condominium unit, the strongest evidence is usually recent sales of other units in the same building.

Berwyn Township

When is the Berwyn Township property tax appeal deadline in 2026?
Closed: the Cook County Board of Review window closed September 29, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Berwyn Township?
Berwyn. Some towns are split between townships; your assessment notice names yours.
How many Berwyn Township homes are assessed higher than similar homes?
Of 12,956 homes Morganwell checked against the county's 2026 values, 4,893 (38%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $715 a year. Estimates, not a promise.
Berwyn step-by-step filing guide

Hyde Park Township

When is the Hyde Park Township property tax appeal deadline in 2026?
Closed: the Cook County Assessor window closed October 8, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Hyde Park Township?
Kenwood, Hyde Park, Woodlawn, South Shore, Greater Grand Crossing, Chatham, South Chicago, East Side. Some towns are split between townships; your assessment notice names yours.
How many Hyde Park Township homes are assessed higher than similar homes?
Of 78,325 homes Morganwell checked against the county's 2026 values, 24,212 (31%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $340 a year. Estimates, not a promise.
Hyde Park step-by-step filing guide

Leyden Township

When is the Leyden Township property tax appeal deadline in 2026?
Closed: the Cook County Assessor window closed October 14, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Leyden Township?
Franklin Park, Melrose Park, Northlake, Schiller Park, River Grove, Rosemont, Elmwood Park. Some towns are split between townships; your assessment notice names yours.
How many Leyden Township homes are assessed higher than similar homes?
Of 27,821 homes Morganwell checked against the county's 2026 values, 7,709 (28%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $531 a year. Estimates, not a promise.
Leyden step-by-step filing guide

Worth Township

When is the Worth Township property tax appeal deadline in 2026?
Closed: the Cook County Assessor window closed October 15, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Worth Township?
Oak Lawn, Evergreen Park, Palos Hills, Chicago Ridge, Alsip, Hometown, Merrionette Park, Worth. Some towns are split between townships; your assessment notice names yours.
How many Worth Township homes are assessed higher than similar homes?
Of 54,330 homes Morganwell checked against the county's 2026 values, 17,537 (32%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $577 a year. Estimates, not a promise.
Worth step-by-step filing guide

Wheeling Township

When is the Wheeling Township property tax appeal deadline in 2026?
File with the Cook County Assessor by October 22, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Wheeling Township?
Wheeling, Buffalo Grove, Prospect Heights, Arlington Heights (part), Mount Prospect (part), Northbrook (part). Some towns are split between townships; your assessment notice names yours.
How many Wheeling Township homes are assessed higher than similar homes?
Of 54,282 homes Morganwell checked against the county's 2026 values, 11,471 (21%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $652 a year. Estimates, not a promise.
Wheeling step-by-step filing guide

Proviso Township

When is the Proviso Township property tax appeal deadline in 2026?
File with the Cook County Assessor by October 27, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Proviso Township?
Maywood, Bellwood, Berkeley, Broadview, Forest Park, Hillside, Westchester, Melrose Park (part). Some towns are split between townships; your assessment notice names yours.
How many Proviso Township homes are assessed higher than similar homes?
Of 44,963 homes Morganwell checked against the county's 2026 values, 16,198 (36%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $642 a year. Estimates, not a promise.
Proviso step-by-step filing guide

Lake Township

When is the Lake Township property tax appeal deadline in 2026?
File with the Cook County Assessor by October 29, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Lake Township?
Bridgeport, Back of the Yards, Englewood, Gage Park, Brighton Park, Chicago Lawn. Some towns are split between townships; your assessment notice names yours.
How many Lake Township homes are assessed higher than similar homes?
Of 145,863 homes Morganwell checked against the county's 2026 values, 48,636 (33%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $311 a year. Estimates, not a promise.
Lake step-by-step filing guide

Palatine Township

When is the Palatine Township property tax appeal deadline in 2026?
File with the Cook County Assessor by November 4, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Palatine Township?
Palatine, Rolling Meadows, Inverness, Arlington Heights (part), Hoffman Estates (part). Some towns are split between townships; your assessment notice names yours.
How many Palatine Township homes are assessed higher than similar homes?
Of 39,233 homes Morganwell checked against the county's 2026 values, 8,895 (23%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $644 a year. Estimates, not a promise.
Palatine step-by-step filing guide

Orland Township

When is the Orland Township property tax appeal deadline in 2026?
File with the Cook County Assessor by November 6, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Orland Township?
Orland Park, Orland Hills, Tinley Park (part), Palos Park (part). Some towns are split between townships; your assessment notice names yours.
How many Orland Township homes are assessed higher than similar homes?
Of 36,133 homes Morganwell checked against the county's 2026 values, 13,010 (36%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $631 a year. Estimates, not a promise.
Orland step-by-step filing guide

Jefferson Township

When is the Jefferson Township property tax appeal deadline in 2026?
File with the Cook County Assessor by November 12, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Jefferson Township?
Jefferson Park, Portage Park, Irving Park, Albany Park, Dunning, Belmont Cragin, Montclare. Some towns are split between townships; your assessment notice names yours.
How many Jefferson Township homes are assessed higher than similar homes?
Of 135,558 homes Morganwell checked against the county's 2026 values, 38,902 (29%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $530 a year. Estimates, not a promise.
Jefferson step-by-step filing guide

West Chicago Township

When is the West Chicago Township property tax appeal deadline in 2026?
File with the Cook County Board of Review by November 6, 2026, with evidence due by November 16, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in West Chicago Township?
Wicker Park, Ukrainian Village, Logan Square, Bucktown, Humboldt Park, West Loop, Pilsen, Little Village. Some towns are split between townships; your assessment notice names yours.
How many West Chicago Township homes are assessed higher than similar homes?
Of 97,159 homes Morganwell checked against the county's 2026 values, 22,181 (23%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $668 a year. Estimates, not a promise.
West Chicago step-by-step filing guide

Lyons Township

When is the Lyons Township property tax appeal deadline in 2026?
File with the Cook County Board of Review by November 6, 2026, with evidence due by November 16, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Lyons Township?
La Grange, Western Springs, Lyons, Brookfield (part), Bridgeview (part), Justice, Willow Springs, Summit. Some towns are split between townships; your assessment notice names yours.
How many Lyons Township homes are assessed higher than similar homes?
Of 35,511 homes Morganwell checked against the county's 2026 values, 13,040 (37%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $914 a year. Estimates, not a promise.
Lyons step-by-step filing guide

Northfield Township

When is the Northfield Township property tax appeal deadline in 2026?
File with the Cook County Board of Review by November 6, 2026, with evidence due by November 16, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Northfield Township?
Glenview, Northbrook, Northfield, Prospect Heights (part), Deerfield (part). Some towns are split between townships; your assessment notice names yours.
How many Northfield Township homes are assessed higher than similar homes?
Of 31,987 homes Morganwell checked against the county's 2026 values, 8,368 (26%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $1,000 a year. Estimates, not a promise.
Northfield step-by-step filing guide

Stickney Township

When is the Stickney Township property tax appeal deadline in 2026?
File with the Cook County Board of Review by November 6, 2026, with evidence due by November 16, 2026. Source: Cook County Assessor and Board of Review calendars (as of October 20, 2026).
Which towns are in Stickney Township?
Burbank, Stickney, Bedford Park (part), Forest View. Some towns are split between townships; your assessment notice names yours.
How many Stickney Township homes are assessed higher than similar homes?
Of 12,841 homes Morganwell checked against the county's 2026 values, 5,233 (41%) come up assessed higher than similar homes nearby. The median estimated saving among them is about $659 a year. Estimates, not a promise.
Stickney step-by-step filing guide

Morganwell is not a law firm and does not give legal advice. You file your own appeal. No outcome is guaranteed.