Cook County Value

421 Fourth St Lemont, IL 60439

4 bed / 2 bath, 2,999 sqft, built 1998, in Lemont. Assessor market value for 2026: $710,010.

Cook County account 22213110170000

Assessor market value
$710,010
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
2,999 sqft
$237 per sqft
Year built
1998
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 18.3% from $600,000 in 2025 to $710,010 in 2026.
  • Assessor market value per square footThe current public record shows about $237 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.

  • 1235 Abbey Oaks Dr Lemont, IL 60439
    2,987 sqft | $224/sqft | built 1998 | Similar size (2,987 vs 2,999 sqft); Built same year (1998); Similar lot size (12,812 vs 12,758 sqft)
    $670,000
  • 16401 Greenway Dr Lemont, IL 60439
    2,992 sqft | $291/sqft | built 1998 | Similar size (2,992 vs 2,999 sqft); Built same year (1998); Similar lot size (13,100 vs 12,758 sqft)
    $870,810
  • 12929 Blue Grass Dr Lemont, IL 60439
    2,974 sqft | $249/sqft | built 1998 | Similar size (2,974 vs 2,999 sqft); Built same year (1998); Similar lot size (13,399 vs 12,758 sqft)
    $740,000
  • 12923 Rolling Meadows Dr Lemont, IL 60439
    3,011 sqft | $249/sqft | built 1998 | Similar size (3,011 vs 2,999 sqft); Built same year (1998); Similar lot size (11,760 vs 12,758 sqft)
    $750,000
  • 16700 Pasture Dr Lemont, IL 60439
    2,995 sqft | $254/sqft | built 2006 | Similar size (2,995 vs 2,999 sqft); Similar lot size (12,613 vs 12,758 sqft); Same quality (Average)
    $760,000

Recent comparable sales

Sales selected by similarity to the subject property.

  • 11 Cedar Ct Lemont, IL 60439
    2,722 sqft | $253/sqft | built 1990 | 9% size difference (2,722 sqft); Moderate age difference (8 years older); Same beds (4)
    $690,000
  • 1238 Acorn St Lemont, IL 60439
    2,802 sqft | $223/sqft | built 1990 | 7% size difference (2,802 sqft); Moderate age difference (8 years older); Within 1 bedroom (3 vs 4)
    $625,000
  • 1217 Woburn Dr Lemont, IL 60439
    2,576 sqft | $318/sqft | built 2016 | 14% size difference (2,576 sqft); Same beds (4)
    $819,000

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 18.3% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$710,010+$110,010+18.3%
2025$600,000$00.0%
2024$600,000$00.0%
2023$600,000+$171,280+40.0%
2022$428,720$00.0%
2021$428,720+$100.0%
2020$428,710——
6-year total+$281,300+65.6%