Lake County property assessments

What the county's own roll says, and how many parcels sit above their neighbours.

278,957parcels on record

265,805with a published assessment

$104,523median assessed value

98,767above their neighbourhood median

Among those, the typical excess is $17,463 of assessed value above the median for like-classified land in the same town — $1,724,787,638 in total across Lake County.

roughly 1 in 3 Lake County properties is assessed above its local median. Whether yours is one of them takes a few seconds to find out — the comparison runs against the same 265,805 assessed parcels shown above.

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Free to check. Nothing is filed on your behalf, and a verdict of "not worth appealing" is the answer we return most often.

A median has half of everything above it by definition, boards do not grant every uniformity claim, and being above a median is a ground to argue rather than proof of error. These are assessed values, not tax bills.

Your deadline in Lake County

30 days from the publication of your township's assessment roll in the local newspaper. The window is short and it is not the same date across the county.

Statutory basis: 35 ILCS 200/16-55. A late filing cannot be cured, so confirm the date on your own notice — it is not the same across the county.

How the assessment was calculated

Illinois assesses at 33.33% of market value. The assessor estimates market value by mass appraisal — a model over recent sales, adjusted by the characteristics they hold on file for your property. If those characteristics are wrong, the number is wrong. The full anatomy is here.

The argument most people miss

Beyond “my house is worth less than they say”, the Illinois Constitution requires uniform taxation. If comparable property near you is assessed at a lower rate per square foot, that is a ground for relief in its own right — no appraisal needed, and built from figures the assessor published themselves.

Towns in Lake County

Waukegan — 24,713 parcels Antioch — 15,355 parcels Mundelein — 14,643 parcels Gurnee — 14,622 parcels Grayslake — 12,928 parcels Highland Park — 12,860 parcels Buffalo Grove — 10,640 parcels Libertyville — 10,258 parcels Vernon Hills — 10,069 parcels Round Lake Beach — 9,885 parcels Lake Villa — 9,788 parcels Lake Zurich — 9,442 parcels Zion — 8,852 parcels Lake Forest — 8,501 parcels Deerfield — 8,407 parcels Wauconda — 7,957 parcels Round Lake — 7,876 parcels Fox Lake — 6,129 parcels Beach Park — 5,972 parcels Lindenhurst — 5,755 parcels North Chicago — 5,406 parcels Ingleside — 4,606 parcels Lake Bluff — 3,995 parcels Hawthorn Woods — 3,837 parcels Barrington — 3,754 parcels Winthrop Harbor — 3,455 parcels Lincolnshire — 3,299 parcels Long Grove — 3,264 parcels Lake Barrington — 2,785 parcels Volo — 2,638 parcels Wadsworth — 2,333 parcels Island Lake — 1,987 parcels Kildeer — 1,918 parcels Round Lake Park — 1,816 parcels Spring Grove — 1,750 parcels Lakemoor — 1,656 parcels North Barrington — 1,646 parcels Riverwoods — 1,576 parcels Green Oaks — 1,571 parcels Highwood — 1,446 parcels

Check your Lake County address — free, no account

Three things you can run right now, free

See a real analysis first

A genuine run against a real Illinois property, generated when you open the page — the verdict, the comparable parcels, and every step of the arithmetic. Nothing to type.

The Twin Test

The parcels the county's own records describe the same way as yours — same class, same town, same size — and what each of them is assessed.

Portfolio Triage

More than one property in Lake County? Paste up to 1,000 PINs and get the whole book ranked by what an appeal is actually worth — including which ones to drop.