Cook County Value

423 Forest Ave, Oak Park, IL 60302

5 bed / 3 bath, 2,834 sqft, built 1889, in Oak Park. Assessor market value for 2026: $1,010,000.

Cook County account 16071020230000

Assessor market value
$1,010,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
2,834 sqft
$356 per sqft
Year built
1889
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 60302, Oak Park, and Oak Park assessment pages.

Local guide: Oak Park Township 2026 Property Tax Appeal Guide.

Appeal deadlines

The 2026 appeal windows for Oak Park have closed (Assessor , Board of Review ). 2027 notices usually start in March.

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 31.8% from $766,140 in 2025 to $1,010,000 in 2026.
  • Assessor market value per square footThe current public record shows about $356 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Oak Park neighborhood and ZIP 60302.
  • Neighborhood value signalAmong 535 residential records in the same neighborhood, the average assessor market value is about $409 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +27.9% on average.

Comparable assessments

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

  • 534 N Grove Ave, Oak Park, IL 60302
    2,846 sqft | $281/sqft | built 1898 | Similar size (2,846 vs 2,834 sqft); Similar lot size (8,550 vs 8,550 sqft); Same quality (Average)
    $800,000
  • 1 Elizabeth Ct, Oak Park, IL 60302
    2,638 sqft | $379/sqft | built 1889 | 7% smaller (2,638 vs 2,834 sqft); Built same year (1889); Similar lot size (8,880 vs 8,550 sqft)
    $1,000,000
  • 335 N Grove Ave, Oak Park, IL 60302
    2,712 sqft | $376/sqft | built 1889 | Similar size (2,712 vs 2,834 sqft); Built same year (1889); Similar lot size (8,758 vs 8,550 sqft)
    $1,020,000
  • 340 N Grove Ave, Oak Park, IL 60302
    2,940 sqft | $344/sqft | built 1893 | Similar size (2,940 vs 2,834 sqft); Similar age (1893 vs 1889); Similar lot size (8,758 vs 8,550 sqft)
    $1,010,000
  • 1024 Erie St, Oak Park, IL 60302
    2,713 sqft | $380/sqft | built 1885 | Similar size (2,713 vs 2,834 sqft); Similar age (1885 vs 1889); Similar lot size (8,950 vs 8,550 sqft)
    $1,030,000

Recent comparable sales

Sales selected by similarity to the subject property.

  • 622 N Ridgeland Ave, Oak Park, IL 60302
    June-26-2026 | 2,477 sqft | $353/sqft | built 1893 | 13% size difference (2,477 sqft); Moderate age difference (4 years newer); Sold after the valuation date
    $875,000
  • 640 Woodbine Ave, Oak Park, IL 60302
    2,496 sqft | $266/sqft | built 1893 | 12% size difference (2,496 sqft); Moderate age difference (4 years newer); Within 1 bedroom (4 vs 5)
    $665,000

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 31.8% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$1,010,000+$243,860+31.8%
2025$766,140−$70,210−8.4%
2024$836,350−$75,140−8.2%
2023$911,490+$251,530+38.1%
2022$659,960$00.0%
2021$659,960−$38,800−5.6%
2020$698,760——
6-year total+$311,240+44.5%