Cook County Value

411 Ontario St, Oak Park, IL 60302

3 bed / 1 bath, 1,549 sqft, built 1891, in Oak Park. Assessor market value for 2026: $440,010.

Cook County account 16072230230000

Assessor market value
$440,010
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,549 sqft
$284 per sqft
Year built
1891
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 15.8% from $380,010 in 2025 to $440,010 in 2026.
  • Assessor market value per square footThe current public record shows about $284 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 1,390 residential records in the same neighborhood, the average assessor market value is about $323 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +22.6% on average.

Comparable assessments

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

  • 1137 Erie St, Oak Park, IL 60302
    1,556 sqft | $347/sqft | built 1898 | Similar size (1,556 vs 1,549 sqft); Similar lot size (3,500 vs 3,425 sqft); Same quality (Average)
    $540,000
  • 537 N Marion St, Oak Park, IL 60302
    1,476 sqft | $359/sqft | built 1905 | Similar size (1,476 vs 1,549 sqft); Similar lot size (3,400 vs 3,425 sqft); Same quality (Average)
    $530,000
  • 1113 Miller Ave, Oak Park, IL 60302
    1,444 sqft | $341/sqft | built 1893 | 7% smaller (1,444 vs 1,549 sqft); Similar age (1893 vs 1891); Similar lot size (3,745 vs 3,425 sqft)
    $492,150
  • 1016 Augusta St, Oak Park, IL 60302
    1,470 sqft | $367/sqft | built 1898 | 5% smaller (1,470 vs 1,549 sqft); Similar lot size (3,100 vs 3,425 sqft); Same quality (Average)
    $540,000
  • 1046 Thomas St, Oak Park, IL 60302
    1,495 sqft | $352/sqft | built 1904 | Similar size (1,495 vs 1,549 sqft); Similar lot size (3,576 vs 3,425 sqft); Same quality (Average)
    $525,740

Recent comparable sales

Sales selected by similarity to the subject property.

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 15.8% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$440,010+$60,000+15.8%
2025$380,010$00.0%
2024$380,010$00.0%
2023$380,010+$42,040+12.4%
2022$337,970−$34,910−9.4%
2021$372,880+$100.0%
2020$372,870——
6-year total+$67,140+18.0%