Cook County Value

507 Warner Ave Lemont, IL 60439

4 bed / 2 bath, 1,912 sqft, built 1886, in Lemont. Assessor market value for 2026: $390,000.

Cook County account 22291030020000

In line with similar homes

8 similar homes nearby support a value at or above your county value.

Assessor market value$390,000
Similar homes$391,195
No gap: similar homes are at or above the county value · bars start at $0

How sure: High · 8 similar homes (5 shown below) · public records only

Assessor market value
$390,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,912 sqft
$204 per sqft
Year built
1886
Average quality

What we found

Similar homes' assessments

Weak

3 of 8 similar homes are assessed lower per square foot. Their similarity-weighted median is $204.60/sqft, which supports a value of $391,195.

Compare this assessment

Start with the county value and property facts, then review appraisal comps, recent sales, and prior-year changes to decide whether the assessment is worth challenging. The comps on this page are free to review; email sign-in is only used to save a printable report.

For nearby context, browse ZIP 60439 and Lemont assessment pages.

Local guide: Lemont Township 2026 Property Tax Appeal Guide.

Appeal deadlines

For Lemont, appeals to the Assessor closed . Board of Review dates for Lemont have not been published yet.

Deadline rule: Set by township: file with the Assessor by your township's last file date, and with the Board of Review while your township is open there. Evidence is reviewed by the Cook County Assessor's Office or, in a separate appeal, by the Cook County Board of Review. Dates checked against the official source.

Assessment snapshot

These public CCAO records highlight what may be worth checking before you file.

  • Assessment changeThe assessor market value increased 21.9% from $320,000 in 2025 to $390,000 in 2026.
  • Assessor market value per square footThe current public record shows about $204 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Lemont neighborhood and ZIP 60439.
  • Neighborhood value signalAmong 1,277 residential records in the same neighborhood, the average assessor market value is about $255 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +25.5% on average.

Comparable assessments

Showing 5 of the 8 similar homes in this property's equity comparison, from public appraisal records.

  • 217 Cass St Lemont, IL 60439
    1,955 sqft | $205/sqft | built 1884 | Similar size (1,955 vs 1,912 sqft); Similar age (1884 vs 1886); Similar lot size (8,712 vs 8,497 sqft)
    $400,000
  • 905 Warner Ave Lemont, IL 60439
    1,780 sqft | $219/sqft | built 1889 | 7% smaller (1,780 vs 1,912 sqft); Similar age (1889 vs 1886); Similar lot size (8,520 vs 8,497 sqft)
    $390,000
  • 613 Walnut Cir Lemont, IL 60439
    1,871 sqft | $192/sqft | built 1879 | Similar size (1,871 vs 1,912 sqft); Similar lot size (8,842 vs 8,497 sqft); Same quality (Average)
    $360,000
  • 600 Czacki St Lemont, IL 60439
    1,938 sqft | $196/sqft | built 1891 | Similar size (1,938 vs 1,912 sqft); Similar age (1891 vs 1886); Similar lot size (7,656 vs 8,497 sqft)
    $380,000
  • 700 Singer Ave Lemont, IL 60439
    1,902 sqft | $205/sqft | built 1893 | Similar size (1,902 vs 1,912 sqft); Similar lot size (8,122 vs 8,497 sqft); Same quality (Average)
    $390,000

Recent comparable sales

No usable comparable sales are available in this data snapshot.

Public appraisal comparison for 2026. Prepared . Appraisal source: Cook County Assessor's Office. Sales data checked in this snapshot: . Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Up 21.9% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$390,000+$70,000+21.9%
2025$320,000$00.0%
2024$320,000$00.0%
2023$320,000+$124,070+63.3%
2022$195,930$00.0%
2021$195,930+$100.0%
2020$195,920——
6-year total+$194,080+99.1%