Cook County Value

408 Porter St Lemont, IL 60439

4 bed / 2 bath, 1,976 sqft, built 1882, in Lemont. Assessor market value for 2026: $400,000.

Cook County account 22204350030000

Assessor market value
$400,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,976 sqft
$202 per sqft
Year built
1882
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 37.9% from $290,000 in 2025 to $400,000 in 2026.
  • Assessor market value per square footThe current public record shows about $202 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.

  • 407 Illinois St Lemont, IL 60439
    2,229 sqft | $287/sqft | built 1887 | 13% larger (2,229 vs 1,976 sqft); Similar age (1887 vs 1882); Similar lot size (2,662 vs 2,625 sqft)
    $640,000
  • 406 Main St Lemont, IL 60439
    1,957 sqft | $169/sqft | built 1869 | Similar size (1,957 vs 1,976 sqft); Lot 13% smaller (2,275 vs 2,625 sqft); Same quality (Average)
    $330,000
  • 216 Main St Lemont, IL 60439
    1,800 sqft | $167/sqft | built 1881 | 9% smaller (1,800 vs 1,976 sqft); Similar age (1881 vs 1882); Lot 19% smaller (2,134 vs 2,625 sqft)
    $300,000
  • 508 E Illinois St Lemont, IL 60439
    1,679 sqft | $214/sqft | built 1881 | Similar age (1881 vs 1882); Lot 15% larger (3,010 vs 2,625 sqft); Same quality (Average)
    $360,000
  • 406 E Illinois St Lemont, IL 60439
    1,626 sqft | $184/sqft | built 1887 | Similar age (1887 vs 1882); Lot 14% smaller (2,250 vs 2,625 sqft); Same quality (Average)
    $300,000

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: . Showing the last prepared sales evidence while recent sales are refreshed. Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Up 37.9% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$400,000+$110,000+37.9%
2025$290,000$00.0%
2024$290,000$00.0%
2023$290,000+$97,720+50.8%
2022$192,280$00.0%
2021$192,280−$8,830−4.4%
2020$201,110——
6-year total+$198,890+98.9%