Cook County Value

1443 Oak Ave Lemont, IL 60439

4 bed / 2 bath, 3,178 sqft, built 1990, in Lemont. Assessor market value for 2026: $680,000.

Cook County account 22271000490000

Assessor market value
$680,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,178 sqft
$214 per sqft
Year built
1990
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 30.8% from $520,000 in 2025 to $680,000 in 2026.
  • Assessor market value per square footThe current public record shows about $214 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 636 residential records in the same neighborhood, the average assessor market value is about $286 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +33.3% on average.

Comparable assessments

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

  • 11271 Bell Rd Lemont, IL 60439
    3,443 sqft | $229/sqft | built 1996 | 8% larger (3,443 vs 3,178 sqft); Similar lot size (38,594 vs 40,728 sqft); Same quality (Average)
    $790,000
  • 12015 Center Dr Lemont, IL 60439
    3,160 sqft | $218/sqft | built 1992 | Similar size (3,160 vs 3,178 sqft); Similar age (1992 vs 1990); Same quality (Average)
    $690,000
  • 11580 S Walker Rd Lemont, IL 60439
    3,155 sqft | $247/sqft | built 1997 | Similar size (3,155 vs 3,178 sqft); Lot 14% larger (46,304 vs 40,728 sqft); Same quality (Average)
    $780,000
  • 12145 Prairie Ct Lemont, IL 60439
    3,378 sqft | $249/sqft | built 1998 | 6% larger (3,378 vs 3,178 sqft); Lot 11% smaller (36,372 vs 40,728 sqft); Same quality (Average)
    $840,010
  • 11970 Prairie Ct Lemont, IL 60439
    3,233 sqft | $238/sqft | built 1998 | Similar size (3,233 vs 3,178 sqft); Same quality (Average); Same bed/bath (4/2)
    $770,000

Recent comparable sales

Sales selected by similarity to the subject property.

  • 1238 Acorn St Lemont, IL 60439
    2,802 sqft | $223/sqft | built 1990 | 12% size difference (2,802 sqft); Similar age (1990); Within 1 bedroom (3 vs 4)
    $625,000
  • 11 Cedar Ct Lemont, IL 60439
    2,722 sqft | $253/sqft | built 1990 | 14% size difference (2,722 sqft); Similar age (1990); Same beds (4)
    $690,000

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 30.8% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$680,000+$160,000+30.8%
2025$520,000$00.0%
2024$520,000$00.0%
2023$520,000+$24,760+5.0%
2022$495,240$00.0%
2021$495,240+$100.0%
2020$495,230——
6-year total+$184,770+37.3%