Cook County Value

12115 Oak Tree Ln Lemont, IL 60439

4 bed / 3 bath, 3,949 sqft, built 1996, in Lemont. Assessor market value for 2026: $850,010.

Cook County account 22272050200000

Assessor market value
$850,010
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,949 sqft
$215 per sqft
Year built
1996
Average quality

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 25.0% from $680,000 in 2025 to $850,010 in 2026.
  • Assessor market value per square footThe current public record shows about $215 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 380 residential records in the same neighborhood, the average assessor market value is about $246 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +25.8% on average.

Comparable assessments

Similar public appraisal records selected for this property's equity comparison.

  • 11976 Holly Ct Lemont, IL 60439
    3,789 sqft | $235/sqft | built 1998 | Similar size (3,789 vs 3,949 sqft); Similar age (1998 vs 1996); Similar lot size (18,608 vs 19,700 sqft)
    $890,000
  • 12176 Oak Tree Ln Lemont, IL 60439
    3,559 sqft | $233/sqft | built 2001 | 10% smaller (3,559 vs 3,949 sqft); Similar age (2001 vs 1996); Similar lot size (19,709 vs 19,700 sqft)
    $830,000
  • 13487 Cambridge Dr Lemont, IL 60439
    4,267 sqft | $300/sqft | built 2005 | 8% larger (4,267 vs 3,949 sqft); Similar lot size (20,134 vs 19,700 sqft); Same quality (Average)
    $1,280,000
  • 13664 Cambridge Dr Lemont, IL 60439
    4,053 sqft | $237/sqft | built 2001 | Similar size (4,053 vs 3,949 sqft); Similar age (2001 vs 1996); Lot 10% smaller (17,719 vs 19,700 sqft)
    $960,000
  • 16619 Windsor Ct Lemont, IL 60439
    3,951 sqft | $238/sqft | built 2004 | Similar size (3,951 vs 3,949 sqft); Lot 18% larger (23,292 vs 19,700 sqft); Same quality (Average)
    $940,010

Recent comparable sales

Sales selected by similarity to the subject property.

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 25.0% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$850,010+$170,010+25.0%
2025$680,000$00.0%
2024$680,000$00.0%
2023$680,000+$44,100+6.9%
2022$635,900$00.0%
2021$635,900+$100.0%
2020$635,890——
6-year total+$214,120+33.7%