Cook County Value

15511 129th St Lemont, IL 60439

3 bed / 2 bath, 1,776 sqft, built 1965, in Lemont. Assessor market value for 2026: $540,000.

Cook County account 22322000330000

Assessor market value
$540,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,776 sqft
$304 per sqft
Year built
1965
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 28.6% from $420,000 in 2025 to $540,000 in 2026.
  • Assessor market value per square footThe current public record shows about $304 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

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

  • 13325 Archer Ave Lemont, IL 60439
    1,803 sqft | $283/sqft | built 1965 | Similar size (1,803 vs 1,776 sqft); Built same year (1965); Lot 16% smaller (28,069 vs 33,279 sqft)
    $510,000
  • 16025 135th St Lemont, IL 60439
    1,606 sqft | $293/sqft | built 1971 | 10% smaller (1,606 vs 1,776 sqft); Lot 11% larger (36,808 vs 33,279 sqft); Same quality (Average)
    $470,000
  • 15420 127th St Lemont, IL 60439
    1,871 sqft | $283/sqft | built 1952 | 5% larger (1,871 vs 1,776 sqft); Lot 10% larger (36,690 vs 33,279 sqft); Same quality (Average)
    $530,000
  • 1261 State St Lemont, IL 60439
    1,906 sqft | $278/sqft | built 1967 | 7% larger (1,906 vs 1,776 sqft); Similar age (1967 vs 1965); Lot 18% larger (39,291 vs 33,279 sqft)
    $530,000
  • 15711 132nd St Lemont, IL 60439
    2,000 sqft | $275/sqft | built 1973 | 13% larger (2,000 vs 1,776 sqft); Similar lot size (35,109 vs 33,279 sqft); Same quality (Average)
    $550,000

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 28.6% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$540,000+$120,000+28.6%
2025$420,000$00.0%
2024$420,000$00.0%
2023$420,000+$125,150+42.4%
2022$294,850$00.0%
2021$294,850+$100.0%
2020$294,840——
6-year total+$245,160+83.2%