Cook County Value

15877 135th St Lemont, IL 60439

4 bed / 2 bath, 4,240 sqft, built 1994, in Lemont Assessor market value for 2026: $996,170.

Cook County account 22323010110000

Assessor market value
$996,170
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
4,240 sqft
$235 per sqft
Year built
1994
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 42.2% from $700,640 in 2025 to $996,170 in 2026.
  • Assessor market value per square footThe current public record shows about $235 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 278 residential records in the same neighborhood, the average assessor market value is about $298 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +39.8% on average.

Comparable assessments

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

  • 1 Galway Ct Lemont, IL 60439
    4,234 sqft | $210/sqft | built 1994 | Similar size (4,234 vs 4,240 sqft); Built same year (1994); Similar lot size (44,843 vs 46,609 sqft)
    $890,000
  • 1390 State St Lemont, IL 60439
    3,676 sqft | $248/sqft | built 2006 | 13% smaller (3,676 vs 4,240 sqft); Similar lot size (47,480 vs 46,609 sqft); Same quality (Average)
    $910,000
  • 151 Galway Rd Lemont, IL 60439
    4,625 sqft | $216/sqft | built 1999 | 9% larger (4,625 vs 4,240 sqft); Similar age (1999 vs 1994); Lot 14% smaller (40,133 vs 46,609 sqft)
    $1,000,000
  • 1382 Gordon Ln Lemont, IL 60439
    4,022 sqft | $204/sqft | built 1993 | 5% smaller (4,022 vs 4,240 sqft); Similar age (1993 vs 1994); Same quality (Average)
    $820,000
  • 15329 130th Pl Lemont, IL 60439
    3,347 sqft | $251/sqft | built 1992 | Similar age (1992 vs 1994); Similar lot size (49,745 vs 46,609 sqft); Same quality (Average)
    $840,000

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: . Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Up 42.2% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$996,170+$295,530+42.2%
2025$700,640+$66,170+10.4%
2024$634,470−$35,530−5.3%
2023$670,000+$161,980+31.9%
2022$508,020$00.0%
2021$508,020$00.0%
2020$508,020——
6-year total+$488,150+96.1%