Cook County Value

3985 Oak Ave, Northbrook, IL 60062

5 bed / 5 bath, 6,034 sqft, built 2009, in Northfield. Assessor market value for 2026: $1,613,810.

Cook County account 04074060030000

Assessor market value
$1,613,810
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
6,034 sqft
$267 per sqft
Year built
2009
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 60062 and Northfield assessment pages.

Local guide: Northfield Township 2026 Property Tax Appeal Guide.

Appeal deadlines

For Northfield, appeals to the Assessor closed . Board of Review dates for Northfield have not been published yet.

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 9.7% from $1,787,710 in 2025 to $1,613,810 in 2026.
  • Assessor market value per square footThe current public record shows about $267 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Northfield neighborhood and ZIP 60062.
  • Neighborhood value signalAmong 422 residential records in the same neighborhood, the average assessor market value is about $304 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +4.6% on average.

Comparable assessments

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

  • 3875 Greenacre Dr, Northbrook, IL 60062
    5,949 sqft | $246/sqft | built 2007 | Similar size (5,949 vs 6,034 sqft); Similar age (2007 vs 2009); Similar lot size (30,400 vs 32,300 sqft)
    $1,463,250
  • 3925 Greenacre Dr, Northbrook, IL 60062
    5,923 sqft | $284/sqft | built 2006 | Similar size (5,923 vs 6,034 sqft); Similar age (2006 vs 2009); Similar lot size (30,400 vs 32,300 sqft)
    $1,683,670
  • 3888 Maple Ave, Northbrook, IL 60062
    6,123 sqft | $288/sqft | built 2006 | Similar size (6,123 vs 6,034 sqft); Similar age (2006 vs 2009); Lot 16% smaller (27,200 vs 32,300 sqft)
    $1,761,600
  • 3841 Oak Ave, Northbrook, IL 60062
    5,872 sqft | $306/sqft | built 2008 | Similar size (5,872 vs 6,034 sqft); Similar age (2008 vs 2009); Lot 20% smaller (25,900 vs 32,300 sqft)
    $1,794,730
  • 3667 Oak Ave, Northbrook, IL 60062
    6,176 sqft | $288/sqft | built 2007 | Similar size (6,176 vs 6,034 sqft); Similar age (2007 vs 2009); Same quality (Average)
    $1,779,690

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: . Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Down 9.7% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$1,613,810−$173,900−9.7%
2025$1,787,710+$97,710+5.8%
2024$1,690,000$00.0%
2023$1,690,000$00.0%
2022$1,690,000+$508,620+43.1%
2021$1,181,380$00.0%
2020$1,181,380——
6-year total+$432,430+36.6%