Cook County Value

12137 Oak Tree Ln Lemont, IL 60439

5 bed / 3 bath, 4,291 sqft, built 2006, in Lemont. Assessor market value for 2026: $910,010.

Cook County account 22272050210000

Assessor market value
$910,010
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
4,291 sqft
$212 per sqft
Year built
2006
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 27.8% from $712,020 in 2025 to $910,010 in 2026.
  • Assessor market value per square footThe current public record shows about $212 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.

  • 12 Limestone Ct Lemont, IL 60439
    4,334 sqft | $235/sqft | built 2006 | Similar size (4,334 vs 4,291 sqft); Built same year (2006); Similar lot size (18,067 vs 18,972 sqft)
    $1,020,000
  • 13487 Cambridge Dr Lemont, IL 60439
    4,267 sqft | $300/sqft | built 2005 | Similar size (4,267 vs 4,291 sqft); Similar age (2005 vs 2006); Similar lot size (20,134 vs 18,972 sqft)
    $1,280,000
  • 12555 Thornberry Dr Lemont, IL 60439
    4,377 sqft | $217/sqft | built 2005 | Similar size (4,377 vs 4,291 sqft); Similar age (2005 vs 2006); Similar lot size (20,459 vs 18,972 sqft)
    $950,000
  • 12258 St. James Way Lemont, IL 60439
    4,165 sqft | $223/sqft | built 2003 | Similar size (4,165 vs 4,291 sqft); Similar age (2003 vs 2006); Similar lot size (17,129 vs 18,972 sqft)
    $930,000
  • 16751 Wilshire Ct Lemont, IL 60439
    4,430 sqft | $230/sqft | built 2007 | Similar size (4,430 vs 4,291 sqft); Similar age (2007 vs 2006); Lot 13% smaller (16,422 vs 18,972 sqft)
    $1,020,000

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: . Showing the last prepared sales evidence while recent sales are refreshed. Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Up 27.8% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$910,010+$197,990+27.8%
2025$712,020$00.0%
2024$712,020−$37,980−5.1%
2023$750,000+$78,880+11.8%
2022$671,120−$12,130−1.8%
2021$683,250$00.0%
2020$683,250——
6-year total+$226,760+33.2%