Cook County Value

12150 Prairie Ave Lemont, IL 60439

4 bed / 4 bath, 3,698 sqft, built 1969, in Lemont. Assessor market value for 2026: $820,000.

Cook County account 22271000680000

Assessor market value
$820,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,698 sqft
$222 per sqft
Year built
1969
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 41.8% from $578,110 in 2025 to $820,000 in 2026.
  • Assessor market value per square footThe current public record shows about $222 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

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

  • 11946 Walker Rd Lemont, IL 60439
    3,646 sqft | $181/sqft | built 1956 | Similar size (3,646 vs 3,698 sqft); Similar lot size (49,805 vs 50,377 sqft); Same quality (Average)
    $660,000
  • 11800 Hillcrest Dr Lemont, IL 60439
    3,872 sqft | $134/sqft | built 1960 | Similar size (3,872 vs 3,698 sqft); Similar lot size (54,080 vs 50,377 sqft); Same quality (Average)
    $520,800
  • 11702 Center Dr Lemont, IL 60439
    3,721 sqft | $226/sqft | built 1983 | Similar size (3,721 vs 3,698 sqft); Same quality (Average); Same bed/bath (4/4)
    $840,000
  • 12001 Prairie Ave Lemont, IL 60439
    2,914 sqft | $247/sqft | built 1984 | Similar lot size (53,273 vs 50,377 sqft); Same quality (Average); Same neighborhood
    $720,000
  • 12020 Pine Ave Lemont, IL 60439
    2,764 sqft | $224/sqft | built 1979 | Lot 11% larger (55,756 vs 50,377 sqft); Same quality (Average); Same neighborhood
    $620,010

Recent comparable sales

No usable comparable sales are available in this data snapshot.

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 41.8% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$820,000+$241,890+41.8%
2025$578,110$00.0%
2024$578,110$00.0%
2023$578,110−$9,760−1.7%
2022$587,870$00.0%
2021$587,870+$100.0%
2020$587,860——
6-year total+$232,140+39.5%