Cook County Value

11280 Dineff Rd Lemont, IL 60439

3 bed / 1 bath, 1,207 sqft, built 1979, in Lemont. Assessor market value for 2026: $420,000.

Cook County account 22241030080000

Assessor market value
$420,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,207 sqft
$348 per sqft
Year built
1979
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 23.5% from $340,000 in 2025 to $420,000 in 2026.
  • Assessor market value per square footThe current public record shows about $348 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.

  • 12070 Walker Rd Lemont, IL 60439
    1,217 sqft | $320/sqft | built 1975 | Similar size (1,217 vs 1,207 sqft); Similar age (1975 vs 1979); Similar lot size (28,200 vs 26,310 sqft)
    $390,000
  • 11990 Center Dr Lemont, IL 60439
    1,227 sqft | $334/sqft | built 1980 | Similar size (1,227 vs 1,207 sqft); Similar age (1980 vs 1979); Same quality (Average)
    $410,000
  • 12103 Walker Rd Lemont, IL 60439
    1,271 sqft | $354/sqft | built 1989 | 5% larger (1,271 vs 1,207 sqft); Similar lot size (24,393 vs 26,310 sqft); Same quality (Average)
    $450,000
  • 12835 Artesian St Lemont, IL 60439
    1,166 sqft | $343/sqft | built 1971 | Similar size (1,166 vs 1,207 sqft); Lot 16% smaller (22,000 vs 26,310 sqft); Same quality (Average)
    $400,000
  • 11935 Hillcrest Dr Lemont, IL 60439
    1,194 sqft | $343/sqft | built 1975 | Similar size (1,194 vs 1,207 sqft); Similar age (1975 vs 1979); Same quality (Average)
    $410,000

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 23.5% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$420,000+$80,000+23.5%
2025$340,000$00.0%
2024$340,000$00.0%
2023$340,000+$124,430+57.7%
2022$215,570−$26,670−11.0%
2021$242,240−$35,060−12.6%
2020$277,300——
6-year total+$142,700+51.5%