Cook County Value

12751 Mayfair Dr Lemont, IL 60439

4 bed / 3 bath, 3,166 sqft, built 2011, in Lemont. Assessor market value for 2026: $840,000.

Cook County account 22312070120000

Assessor market value
$840,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,166 sqft
$265 per sqft
Year built
2011
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 31.1% from $640,890 in 2025 to $840,000 in 2026.
  • Assessor market value per square footThe current public record shows about $265 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 2,806 residential records in the same neighborhood, the average assessor market value is about $255 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +30.4% on average.

Comparable assessments

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

  • 1515 Magdalena Dr Lemont, IL 60439
    3,143 sqft | $286/sqft | built 2011 | Similar size (3,143 vs 3,166 sqft); Built same year (2011); Similar lot size (14,190 vs 14,602 sqft)
    $900,000
  • 1306 S Krystyna Crossing Lemont, IL 60439
    3,163 sqft | $266/sqft | built 2014 | Similar size (3,163 vs 3,166 sqft); Similar age (2014 vs 2011); Similar lot size (14,635 vs 14,602 sqft)
    $840,000
  • 12984 Waterford Dr Lemont, IL 60439
    3,162 sqft | $262/sqft | built 2009 | Similar size (3,162 vs 3,166 sqft); Similar age (2009 vs 2011); Similar lot size (14,438 vs 14,602 sqft)
    $830,010
  • 13090 Klappa Dr Lemont, IL 60439
    3,187 sqft | $248/sqft | built 2013 | Similar size (3,187 vs 3,166 sqft); Similar age (2013 vs 2011); Similar lot size (13,993 vs 14,602 sqft)
    $790,000
  • 1297 Drawbridge Ln Lemont, IL 60439
    3,183 sqft | $226/sqft | built 1999 | Similar size (3,183 vs 3,166 sqft); Similar lot size (14,739 vs 14,602 sqft); Same quality (Average)
    $720,000

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 31.1% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$840,000+$199,110+31.1%
2025$640,890$00.0%
2024$640,890−$79,110−11.0%
2023$720,000+$277,020+62.5%
2022$442,980$00.0%
2021$442,980−$28,720−6.1%
2020$471,700——
6-year total+$368,300+78.1%