This page helps users handle a Property Search in McHenry County, Illinois, by showing where to look up tax, parcel, assessment, and map-based property information.

Start with the McHenry County Property Tax Inquiry for tax bill and parcel searches. Use Athena - Public Property Search when you need a map-based view of parcel data and assessment details.

McHenry County Property Tax Inquiry

The McHenry County Property Tax Inquiry is the main online tool for looking up current or prior property tax bill information and starting an online payment.

Have one of these search details ready before using the parcel criteria search:

  • Parcel Number or PIN
  • Owner name
  • Property address

The system also includes Basic Search, Address Search, Sales Search, Advanced Search, and Mobile Home Search options.

  • Enter a Parcel Number/PIN, owner name, or address in the parcel criteria box.
  • Select Search to open the matching property record results.
  • Use the green PAY TAXES button when you need to pay a bill online.
  • Add all selected items to the cart, then open the Shopping Cart to complete payment and print a receipt.

Payment note: eChecks are free. Debit cards, credit cards, and digital wallet payments have a 2.4% fee, and the McHenry County Treasurer's Office receives no part of that fee.

Athena - Public Property Search is McHenry County's interactive property map. It combines geographic parcel data with tax assessment information.

Use Athena when you want to review property information visually. The viewer supports parcel details, map layers, parcel sales, assessment information, aerial basemaps, measuring tools, printing, and CSV export from results.

The county describes Athena as a property information map where users can find property owner details, assessed value, and property sales.

Assessment records and parcel maintenance

The McHenry County Office of Assessments monitors countywide real property valuation for real estate taxation. Current and past assessments of property in McHenry County can be found through the McHenry County Property Tax Inquiry.

The Office of Assessments handles work tied to township assessor review, exemptions, preferential assessments, sales ratio studies, equalization factors, assessment notices, appeals, assessment roll certification, parcel numbering, cadastral maps, legal descriptions, ownership, mailing addresses, and property location information.

For assessed value questions, the Treasurer's property tax page directs users to the appropriate Township Assessor. For exemptions, assessment notices, tax appeals, name or address changes, farm and special assessments, or mapping questions, it directs users to the Assessment's Office.

Tax dates and payment timing

McHenry County lists these 2026 property tax dates for 2025 property taxes payable in 2026:

Date Property tax item
June 9, 2026 First installment due date
June 10, 2026 1.5% interest per month begins on late payments under Illinois state statute
September 9, 2026 Second installment due date
September 10, 2026 1.5% interest per month begins on late second-installment payments
November 11, 2026 Last day to pay online
November 13, 2026 Last day to pay taxes to avoid the tax sale; 5 PM cutoff, no postmark
November 16, 2026 Tax sale begins at 9 AM

GIS data and interactive maps

McHenry County GIS maintains property mapping resources for public use. Its GIS Data Hub includes an Athena - Property Viewer, spatial data, tax parcels, taxing districts, aerial photos, and other map resources.

The county's interactive maps page states that Athena gives residents and businesses access to property owner information, assessed value, and property sales. For zoning and land use information, McHenry County uses the separate PlanDev Viewer.

The GIS Data Hub also lists the McHenry County TaxParcels dataset as a feature service with tax parcel tags.

Other property-related offices

Some property questions belong outside the tax inquiry tool. McHenry County routes different property tax and land record questions to different offices.

  • Contact the County Clerk for tax rates, tax levies in a district, and redemption information for taxes that have been sold.
  • Contact the County Recorder for quit claim deed forms, release of lien questions, deeds, and recorded land records.
  • Contact the Treasurer for property tax bills, amounts due, and payment options.

McHenry County property search contacts

Use these offices for help with property tax, assessment, mapping, and land record questions.

Common questions

Where can I search McHenry County property tax information online?

Use the property tax inquiry tool to search by Parcel Number/PIN, owner name, or address.

Where can I view McHenry County property information on a map?

Use Athena for map-based parcel details, assessment information, property owner information, assessed value, and property sales.

Who handles assessed value questions?

For assessed value questions or concerns that a property value may be too high, McHenry County directs users to their Township Assessor.

Who handles name or address changes on tax records?

The County Assessment office enters change of address information. Ownership names on tax records are changed by the County Assessment office from deeds filed in the County Recorder's Office.

Who should I contact about a property tax bill or amount due?

Contact the McHenry County Treasurer's Office at (815) 334-4260 or [[email protected]](mailto:[email protected]) for property tax bill, amount due, and payment option questions.

Who should I contact about deeds or recorded land records?

Contact the McHenry County Recorder's Office at (815) 334-4110 or [[email protected]](mailto:[email protected]) for deeds, recorded land records, quit claim deed forms, and release of lien questions.