Cook County Value

512 Marengo Ave Forest Park, IL 60130

4 bed / 2 bath, 2,390 sqft, built 1910, in Proviso. Assessor market value for 2026: $630,000.

Cook County account 15132140040000

Assessor market value
$630,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
2,390 sqft
$264 per sqft
Year built
1910
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 30.1% from $484,390 in 2025 to $630,000 in 2026.
  • Assessor market value per square footThe current public record shows about $264 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.

  • 513 Elgin Ave Forest Park, IL 60130
    2,470 sqft | $231/sqft | built 1913 | Similar size (2,470 vs 2,390 sqft); Similar age (1913 vs 1910); Similar lot size (8,000 vs 8,000 sqft)
    $570,000
  • 516 Beloit Ave Forest Park, IL 60130
    2,328 sqft | $245/sqft | built 1906 | Similar size (2,328 vs 2,390 sqft); Similar age (1906 vs 1910); Similar lot size (8,255 vs 8,000 sqft)
    $570,000
  • 26 Lathrop Ave Forest Park, IL 60130
    2,401 sqft | $212/sqft | built 1906 | Similar size (2,401 vs 2,390 sqft); Similar age (1906 vs 1910); Similar lot size (8,160 vs 8,000 sqft)
    $510,000
  • 525 Elgin Ave Forest Park, IL 60130
    2,416 sqft | $182/sqft | built 1919 | Similar size (2,416 vs 2,390 sqft); Similar lot size (8,000 vs 8,000 sqft); Same quality (Average)
    $440,000
  • 438 Circle Ave Forest Park, IL 60130
    2,501 sqft | $252/sqft | built 1909 | Similar size (2,501 vs 2,390 sqft); Similar age (1909 vs 1910); Lot 12% smaller (7,000 vs 8,000 sqft)
    $630,000

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 | Moderate age difference (6 years newer); Within 1 bedroom (3 vs 4)
    $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 30.1% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$630,000+$145,610+30.1%
2025$484,390−$15,610−3.1%
2024$500,000$00.0%
2023$500,000+$125,110+33.4%
2022$374,890−$26,290−6.6%
2021$401,180−$68,820−14.6%
2020$470,000——
6-year total+$160,000+34.0%