This page helps users with a Property Search in Cook County, Illinois by explaining the main official tools, what information to enter, and where to go next when a search needs more detail.

The Cook County Assessor's Office offers address, PIN, neighborhood, and advanced search options for assessment-related property information.

The Cook County Assessor's Office provides a public Search by Address tool for finding a property by location details. Use the street name without words like street, place, lane, or their abbreviations.

  • House number
  • Street name
  • City
  • Direction or unit number, when needed

You can also use the same page to search by neighborhood when you know the township, neighborhood, or property class.

  • Enter the house number and street name.
  • Add the city and any direction or unit information that applies.
  • Complete the CAPTCHA and submit the search.
  • Review the matching property results before opening details.

Advanced property search options

The Assessor's Advanced Search page supports broader searches when a simple address search is not enough.

  • Search with the first 10 digits of a PIN.
  • Search by an address range using starting and ending house numbers.
  • Search by applicant name, attorney name, attorney code, or appeal number details.
  • Search by a PIN range using 8 or more digits.
  • Filter by township or property class when those details are known.

For PIN searches, enter the digits carefully; some Cook County tools accept 10-digit or 14-digit PIN formats depending on the search page.

Assessor property details

The Assessor's property detail tool can show estimated market value, assessed value, and property characteristics for properties in Cook County. It also includes details related to permits, divisions and consolidations, the Homeowner Improvement Exemption, and neighborhood sales information.

Neighborhood sales can help owners review real estate transactions within the same neighborhood code from the last 36 months. This can be useful when researching market value or preparing for an assessment appeal.

For residential property, assessed value is usually 10% of estimated market value. For commercial property, assessed value is typically 25% of estimated market value.

CookViewer map and comparable properties

CookViewer is a Cook County GIS map tool that can search by PIN, address, intersection, or parcel selection on the map. Search results can show property details, tax details, assessed value, building characteristics, historical imagery, parcel archive layers, and district information.

CookViewer also supports comparison tools. After selecting a property, users can compare properties using factors such as neighborhood, class, square footage, age, and search radius.

  • Use a 10-digit PIN, 14-digit PIN, PIN with dashes, property address, or street intersection in the search bar.
  • Select a result to open the property details panel.
  • Use export options to download results as CSV or Excel when available.
  • Use parcel archive layers to review parcel boundaries from 2000 to the current year.

Recorded land records through the Cook County Clerk

Assessment information and recorded land records are handled through different official offices. For deeds and other recorded property documents, use the Cook County Clerk's Search Recordings page or the Clerk's Property Records Search.

The Clerk's Recordings System can retrieve records by address, PIN, grantor, grantee, document number, and other indexed details. For best results, the Clerk recommends retrieving recordings by PIN.

Some document types, including annexations, condominium declarations, easements, highway plats, monuments, plats, and real estate transfer declarations, are not available for purchase on the Clerk's website and may need to be purchased at the downtown office.

Cook County Assessor contact information

Use the Assessor's Office for help with assessment-related property search questions, address or PIN lookups, property details, exemptions, and appeal-related property information.

  • Cook County Assessor's Office, 118 North Clark Street, Third Floor, Room #320, Chicago, IL 60602
    Phone: (312) 443-7550
  • Downtown Office, 118 N. Clark Street, Room 320, Chicago, IL 60602
    Phone: (312) 443-7550
    Hours: 8:30 a.m. - 5:00 p.m.
  • Markham Branch Office, 16501 S. Kedzie Ave. Room #237, Markham, IL 60426
    Phone: (312) 443-7550
    Hours: 8:30 a.m. - 4:30 p.m.
  • Skokie Branch Office, 5600 W. Old Orchard Rd., Room #149, Skokie, IL 60077
    Phone: (312) 443-7550
    Hours: 8:30 a.m. - 4:30 p.m.
  • Bridgeview Branch Office, 10200 South 76th Avenue, Room #237, Bridgeview, IL 60455
    Phone: (312) 443-7550
    Hours: 8:30 a.m. - 4:30 p.m.

Common questions

Where can I search for a Cook County property by address?

Use the Cook County Assessor's Search by Address tool. Enter the house number, street name, and city, and do not include street-type words such as street, lane, or place in the street name field.

Can I search Cook County property records without a full PIN?

Yes. The Assessor's Advanced Search allows searches using the first 10 digits of a PIN or a PIN range of 8 or more digits.

Which office has recorded deeds and land records?

The Cook County Clerk handles recorded land records. The Clerk's Recordings System can search by address, PIN, grantor, grantee, document number, and other indexed details.

What property details can the Assessor's Office show?

The Assessor's property details can include estimated market value, assessed value, property characteristics, permits, divisions and consolidations, Homeowner Improvement Exemption information, and neighborhood sales.

How do I find comparable properties in Cook County?

CookViewer can compare properties after you select a parcel. The comparison tool uses factors such as property class, neighborhood, square footage, age, and search radius.

Who should I call for Assessor property search help?

Call the Cook County Assessor's Office at (312) 443-7550 for assessment-related property search assistance.