Cook County Value

603 Porter St Lemont, IL 60439

2 bed / 1 bath, 784 sqft, built 1904, in Lemont. Assessor market value for 2026: $220,000.

Cook County account 22204300070000

Assessor market value
$220,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
784 sqft
$281 per sqft
Year built
1904
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 $186,020 in 2025 to $220,000 in 2026.
  • Assessor market value per square footThe current public record shows about $281 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 1,277 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 +25.5% on average.

Comparable assessments

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

  • 705 Porter St Lemont, IL 60439
    706 sqft | $283/sqft | built 1899 | 10% smaller (706 vs 784 sqft); Similar age (1899 vs 1904); Similar lot size (4,650 vs 4,650 sqft)
    $200,000
  • 310 Julia St Lemont, IL 60439
    840 sqft | $298/sqft | built 1915 | 7% larger (840 vs 784 sqft); Similar lot size (4,650 vs 4,650 sqft); Same quality (Average)
    $250,000
  • 541 McCarthy St Lemont, IL 60439
    784 sqft | $255/sqft | built 1892 | Similar size (784 vs 784 sqft); Lot 14% smaller (3,990 vs 4,650 sqft); Same quality (Average)
    $200,000
  • 405 Porter St Lemont, IL 60439
    753 sqft | $266/sqft | built 1919 | Similar size (753 vs 784 sqft); Lot 11% smaller (4,140 vs 4,650 sqft); Same quality (Average)
    $200,010
  • 310 Lockport St Lemont, IL 60439
    929 sqft | $258/sqft | built 1911 | Similar lot size (4,247 vs 4,650 sqft); Same quality (Average); Same bed/bath (2/1)
    $240,000

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: . 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$220,000+$33,980+18.3%
2025$186,020−$19,520−9.5%
2024$205,540−$14,460−6.6%
2023$220,000+$112,070+103.8%
2022$107,930$00.0%
2021$107,930+$100.0%
2020$107,920——
6-year total+$112,080+103.9%