Cook County Value

447 Marengo Ave Forest Park, IL 60130

5 bed / 3 bath, 3,030 sqft, built 1896, in Proviso. Assessor market value for 2026: $730,000.

Cook County account 15132050270000

Assessor market value
$730,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,030 sqft
$241 per sqft
Year built
1896
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 decreased 11.3% from $823,430 in 2025 to $730,000 in 2026.
  • Assessor market value per square footThe current public record shows about $241 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.

  • 423 Elgin Ave Forest Park, IL 60130
    3,092 sqft | $233/sqft | built 1893 | Similar size (3,092 vs 3,030 sqft); Similar age (1893 vs 1896); Similar lot size (8,000 vs 7,700 sqft)
    $720,000
  • 431 Elgin Ave Forest Park, IL 60130
    3,048 sqft | $154/sqft | built 1893 | Similar size (3,048 vs 3,030 sqft); Similar age (1893 vs 1896); Similar lot size (8,000 vs 7,700 sqft)
    $470,000
  • 431 Marengo Ave Forest Park, IL 60130
    2,973 sqft | $229/sqft | built 1899 | Similar size (2,973 vs 3,030 sqft); Similar age (1899 vs 1896); Similar lot size (7,000 vs 7,700 sqft)
    $680,000
  • 517 Elgin Ave Forest Park, IL 60130
    3,020 sqft | $225/sqft | built 1908 | Similar size (3,020 vs 3,030 sqft); Similar lot size (8,000 vs 7,700 sqft); Same quality (Average)
    $680,000
  • 502 Thomas Ave Forest Park, IL 60130
    2,821 sqft | $241/sqft | built 1887 | 7% smaller (2,821 vs 3,030 sqft); Similar lot size (6,985 vs 7,700 sqft); Same quality (Average)
    $680,000

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

Down 11.3% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$730,000−$93,430−11.3%
2025$823,430$00.0%
2024$823,430−$66,570−7.5%
2023$890,000+$221,700+33.2%
2022$668,300$00.0%
2021$668,300+$100.0%
2020$668,290——
6-year total+$61,710+9.2%