Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. Every office link was opened and checked against the office's own site between September 23, 2026 and September 25, 2026.
Mount Prospect, Illinois, in Cook County, has about 55,000 residents (2024 Census Bureau estimate). The title to a parcel in Mount Prospect is in the deed records of the County Recorder and its taxable value is set by the Supervisor of Assessments; what is built on it is a matter for the city. This guide says who keeps each record and where the page for each office is.
This guide covers deeds, assessed values, city permits and records, evictions and court cases, records requests, directory links and common questions.
Related guides: Mount Prospect public records, Cook County property records, Mount Prospect arrest records, Mount Prospect warrants, Mount Prospect inmate search, Mount Prospect criminal records, Illinois arrest records and Illinois inmate search.
Deeds, Mortgages and Liens in Mount Prospect
Who owns a parcel in Mount Prospect and what it sold for are in the deed records of the County Recorder, with every lien or mortgage against the land.
SearchSystems opened and checked the County Recorder's page at cookcountyclerkil.gov/recordings (page title: Recordings | Cook County Clerk), which answered when SearchSystems opened it on September 23, 2026.
Assessed Values and the Tax Roll in Mount Prospect
What a parcel in Mount Prospect is taxed on is the business of the Supervisor of Assessments, which also keeps the parcel maps. Illinois assesses property at a third of market value; Cook County reassesses one third of the county each year and the rest of the state runs on four-year cycles.
SearchSystems opened and checked the Supervisor of Assessments' page at cookcountyil.gov/agency/assessor (page title: Assessor), phone (312) 443-7550, 118 North Clark Street, Chicago, IL 60602, Monday: 8:30 am-5:00 pm, which answered when SearchSystems opened it on September 23, 2026.
Permits and City Records in Mount Prospect
Building permits, zoning and code cases are the city's own. For Mount Prospect, SearchSystems opened and checked the city hall page at mountprospect.org/how-do-i/contact-us (page title: Contact Us | Village of Mount Prospect, IL), phone 847-392-6000, 50 S. Emerson Street, Mount Prospect, IL 60056, Monday - Friday, 8:30 a.m. - 5:00 p.m., which answered when SearchSystems opened it on September 25, 2026.
The city clerk's page SearchSystems verified is at mountprospect.org/departments/village-administration/village-clerk (page title: Village Clerk | Village of Mount Prospect, IL), phone 847.392-6022, which answered when SearchSystems opened it on September 25, 2026.
Evictions and Court Cases About Land in Mount Prospect
An eviction, a foreclosure, a lien dispute or a quiet title suit is a court case in the Circuit Court of Cook County, and the file is public unless sealed.
The court records page SearchSystems verified for the county is at cookcountyil.gov/service/court-records-and-archives.
Asking a County Office for a Record
Under the Illinois Freedom of Information Act a county office must answer a request within 5 business days, with one 5-day extension, and it may charge copying only after the first 50 pages.
More Official Property and Land Records Pages for Cook County
The SearchSystems directory, online since 1997, lists the official pages for Cook County and Illinois. These property pages from its Cook County listing were opened again on October 1, 2026 and each one still answers:
- Cook County Treasurer's Office (cookcountytreasurer.com)
- Recording Terms and Topics (cookcountyclerkil.gov)
Frequently Asked Questions
Who records deeds in Mount Prospect?
The County Recorder, at cookcountyclerkil.gov/recordings. Deeds, mortgages and liens on land in Mount Prospect are filed there, and the Supervisor of Assessments (cookcountyil.gov/agency/assessor) has the assessment records.
Who sets the assessed value of a property in Mount Prospect?
The Supervisor of Assessments, whose page SearchSystems verified is at cookcountyil.gov/agency/assessor.
Where are evictions from Mount Prospect filed?
In the Circuit Court of Cook County. The file is public unless the court seals it.
How is property assessed in Illinois?
Illinois assesses property at a third of market value; Cook County reassesses one third of the county each year and the rest of the state runs on four-year cycles.
Is this the official Mount Prospect website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.