Cook County Value

504 Marengo Ave Forest Park, IL 60130

3 bed / 2 bath, 1,911 sqft, built 1914, in Proviso. Assessor market value for 2026: $490,000.

Cook County account 15132140020000

Assessor market value
$490,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,911 sqft
$256 per sqft
Year built
1914
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 60130 and Proviso assessment pages.

Local guide: Proviso Township 2026 Property Tax Appeal Guide.

Appeal deadlines

For Proviso, appeals to the Assessor are open through (7 days left).

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 22.5% from $400,000 in 2025 to $490,000 in 2026.
  • Assessor market value per square footThe current public record shows about $256 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Proviso neighborhood and ZIP 60130.
  • Neighborhood value signalAmong 1,139 residential records in the same neighborhood, the average assessor market value is about $260 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +21.6% on average.

Comparable assessments

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

  • 526 Marengo Ave Forest Park, IL 60130
    1,944 sqft | $247/sqft | built 1908 | Similar size (1,944 vs 1,911 sqft); Similar lot size (8,000 vs 8,000 sqft); Same quality (Average)
    $480,000
  • 244 Circle Ave Forest Park, IL 60130
    1,848 sqft | $227/sqft | built 1912 | Similar size (1,848 vs 1,911 sqft); Similar age (1912 vs 1914); Similar lot size (7,781 vs 8,000 sqft)
    $420,000
  • 427 Elgin Ave Forest Park, IL 60130
    1,875 sqft | $251/sqft | built 1902 | Similar size (1,875 vs 1,911 sqft); Similar lot size (8,000 vs 8,000 sqft); Same quality (Average)
    $470,000
  • 520 Marengo Ave Forest Park, IL 60130
    1,836 sqft | $251/sqft | built 1903 | Similar size (1,836 vs 1,911 sqft); Similar lot size (8,000 vs 8,000 sqft); Same quality (Average)
    $460,000
  • 524 Circle Ave Forest Park, IL 60130
    1,848 sqft | $238/sqft | built 1910 | Similar size (1,848 vs 1,911 sqft); Similar age (1910 vs 1914); Lot 12% smaller (7,000 vs 8,000 sqft)
    $440,000

Recent comparable sales

Sales selected by similarity to the subject property.

  • 902 Ferdinand Ave Forest Park, IL 60130
    1,698 sqft | $233/sqft | built 1916 | 11% size difference (1,698 sqft); Similar age (1916); Same beds (3)
    $395,000

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 22.5% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$490,000+$90,000+22.5%
2025$400,000$00.0%
2024$400,000$00.0%
2023$400,000+$94,600+31.0%
2022$305,400−$32,080−9.5%
2021$337,480$00.0%
2020$337,480——
6-year total+$152,520+45.2%