Cook County Value

841 Marengo Ave Forest Park, IL 60130

3 bed / 1 bath, 1,267 sqft, built 1920, in Proviso. Assessor market value for 2026: $350,000.

Cook County account 15134050360000

Assessor market value
$350,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,267 sqft
$276 per sqft
Year built
1920
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 (8 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 10.6% from $316,420 in 2025 to $350,000 in 2026.
  • Assessor market value per square footThe current public record shows about $276 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 1,610 residential records in the same neighborhood, the average assessor market value is about $258 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +17.7% on average.

Comparable assessments

Showing 5 of the 8 similar homes in this property's equity comparison, from public appraisal records.

  • 839 Marengo Ave Forest Park, IL 60130
    1,267 sqft | $276/sqft | built 1916 | Similar size (1,267 vs 1,267 sqft); Similar age (1916 vs 1920); Similar lot size (4,687 vs 4,687 sqft)
    $350,000
  • 921 Harlem Ave Forest Park, IL 60130
    1,248 sqft | $264/sqft | built 1922 | Similar size (1,248 vs 1,267 sqft); Similar age (1922 vs 1920); Similar lot size (4,687 vs 4,687 sqft)
    $330,000
  • 917 Harlem Ave Forest Park, IL 60130
    1,224 sqft | $253/sqft | built 1922 | Similar size (1,224 vs 1,267 sqft); Similar age (1922 vs 1920); Similar lot size (4,687 vs 4,687 sqft)
    $310,000
  • 935 Hannah Ave Forest Park, IL 60130
    1,290 sqft | $302/sqft | built 1922 | Similar size (1,290 vs 1,267 sqft); Similar age (1922 vs 1920); Similar lot size (4,875 vs 4,687 sqft)
    $390,000
  • 826 Ferdinand Ave Forest Park, IL 60130
    1,292 sqft | $240/sqft | built 1913 | Similar size (1,292 vs 1,267 sqft); Similar lot size (4,687 vs 4,687 sqft); Same quality (Average)
    $310,000

Recent comparable sales

Sales selected by similarity to the subject property.

  • 1125 Marengo Ave Forest Park, IL 60130
    1,040 sqft | $372/sqft | built 1923 | Similar age (1923); Same beds (3)
    $387,000

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 10.6% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$350,000+$33,580+10.6%
2025$316,420$00.0%
2024$316,420−$23,580−6.9%
2023$340,000+$117,540+52.8%
2022$222,460−$45,160−16.9%
2021$267,620+$100.0%
2020$267,610——
6-year total+$82,390+30.8%