Cook County Value

18 115th St Lemont, IL 60439

4 bed / 2 bath, 3,145 sqft, built 1980, in Lemont. Assessor market value for 2026: $760,010.

Cook County account 22241050090000

Assessor market value
$760,010
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,145 sqft
$242 per sqft
Year built
1980
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 32.5% from $573,500 in 2025 to $760,010 in 2026.
  • Assessor market value per square footThe current public record shows about $242 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 321 residential records in the same neighborhood, the average assessor market value is about $244 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +52.5% on average.

Comparable assessments

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

  • 5 Equestrian Way Lemont, IL 60439
    3,080 sqft | $244/sqft | built 1981 | Similar size (3,080 vs 3,145 sqft); Similar age (1981 vs 1980); Similar lot size (41,534 vs 42,732 sqft)
    $750,000
  • 8 Surrey Lemont, IL 60439
    3,126 sqft | $266/sqft | built 1987 | Similar size (3,126 vs 3,145 sqft); Similar lot size (43,642 vs 42,732 sqft); Same quality (Average)
    $830,000
  • 16 Horseshoe Ln Lemont, IL 60439
    2,938 sqft | $262/sqft | built 1980 | 7% smaller (2,938 vs 3,145 sqft); Built same year (1980); Similar lot size (42,601 vs 42,732 sqft)
    $770,000
  • 8 Horseshoe Ln Lemont, IL 60439
    3,300 sqft | $258/sqft | built 1978 | Similar size (3,300 vs 3,145 sqft); Similar age (1978 vs 1980); Similar lot size (43,220 vs 42,732 sqft)
    $850,010
  • 1 Buckskin Lemont, IL 60439
    3,381 sqft | $237/sqft | built 1981 | 8% larger (3,381 vs 3,145 sqft); Similar age (1981 vs 1980); Similar lot size (41,599 vs 42,732 sqft)
    $800,000

Recent comparable sales

Sales selected by similarity to the subject property.

  • 1238 Acorn St Lemont, IL 60439
    2,802 sqft | $223/sqft | built 1990 | 11% size difference (2,802 sqft); Moderate age difference (10 years newer); Within 1 bedroom (3 vs 4)
    $625,000
  • 11 Cedar Ct Lemont, IL 60439
    2,722 sqft | $253/sqft | built 1990 | 13% size difference (2,722 sqft); Moderate age difference (10 years newer); Same beds (4)
    $690,000
  • 1373 Gordon Ln Lemont, IL 60439
    2,834 sqft | $106/sqft | built 1985 | 10% size difference (2,834 sqft); Moderate age difference (5 years newer); Same beds (4)
    $300,000

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 32.5% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$760,010+$186,510+32.5%
2025$573,500$00.0%
2024$573,500−$26,500−4.4%
2023$600,000+$165,100+38.0%
2022$434,900$00.0%
2021$434,900$00.0%
2020$434,900——
6-year total+$325,110+74.8%