Cook County Value

12735 Mayfair Dr Lemont, IL 60439

5 bed / 3 bath, 4,254 sqft, built 2005, in Lemont. Assessor market value for 2026: $920,000.

Cook County account 22312070130000

Assessor market value
$920,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
4,254 sqft
$216 per sqft
Year built
2005
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 19.5% from $770,000 in 2025 to $920,000 in 2026.
  • Assessor market value per square footThe current public record shows about $216 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.

  • 57 Deer Ln Lemont, IL 60439
    4,350 sqft | $216/sqft | built 2006 | Similar size (4,350 vs 4,254 sqft); Similar age (2006 vs 2005); Lot 10% smaller (15,462 vs 17,202 sqft)
    $940,000
  • 15173 Turnberry Trl Lemont, IL 60439
    4,170 sqft | $218/sqft | built 1995 | Similar size (4,170 vs 4,254 sqft); Similar lot size (17,247 vs 17,202 sqft); Same quality (Average)
    $910,000
  • 13023 Ravine Dr Lemont, IL 60439
    4,252 sqft | $219/sqft | built 1998 | Similar size (4,252 vs 4,254 sqft); Similar lot size (18,469 vs 17,202 sqft); Same quality (Average)
    $930,010
  • 16616 Pasture Dr Lemont, IL 60439
    4,246 sqft | $250/sqft | built 2016 | Similar size (4,246 vs 4,254 sqft); Similar lot size (17,914 vs 17,202 sqft); Same quality (Average)
    $1,060,000
  • 1382 Camelot Ln Lemont, IL 60439
    4,408 sqft | $202/sqft | built 2004 | Similar size (4,408 vs 4,254 sqft); Similar age (2004 vs 2005); Lot 12% smaller (15,204 vs 17,202 sqft)
    $890,000

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 19.5% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$920,000+$150,000+19.5%
2025$770,000$00.0%
2024$770,000$00.0%
2023$770,000+$209,850+37.5%
2022$560,150$00.0%
2021$560,150$00.0%
2020$560,150——
6-year total+$359,850+64.2%