Cook County Value

431 Washington Ave, Wilmette, IL 60091

4 bed / 3 bath, 3,762 sqft, built 1912, in New Trier. Assessor market value for 2026: $1,696,250.

Cook County account 05351020010000

Assessor market value
$1,696,250
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,762 sqft
$451 per sqft
Year built
1912
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 60091 and New Trier assessment pages.

Local guide: New Trier Township 2026 Property Tax Appeal Guide.

Appeal deadlines

The 2026 appeal windows for New Trier 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 decreased 5.2% from $1,790,010 in 2025 to $1,696,250 in 2026.
  • Assessor market value per square footThe current public record shows about $451 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the New Trier neighborhood and ZIP 60091.
  • Neighborhood value signalAmong 807 residential records in the same neighborhood, the average assessor market value is about $481 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -2.6% on average.

Comparable assessments

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

  • 210 Broadway Ave, Wilmette, IL 60091
    3,704 sqft | $440/sqft | built 1909 | Similar size (3,704 vs 3,762 sqft); Similar age (1909 vs 1912); Similar lot size (10,637 vs 11,250 sqft)
    $1,630,000
  • 415 Laurel Ave, Wilmette, IL 60091
    3,618 sqft | $439/sqft | built 1920 | Similar size (3,618 vs 3,762 sqft); Similar lot size (11,200 vs 11,250 sqft); Same quality (Average)
    $1,590,000
  • 613 Central Ave, Wilmette, IL 60091
    3,729 sqft | $466/sqft | built 1909 | Similar size (3,729 vs 3,762 sqft); Similar age (1909 vs 1912); Similar lot size (10,500 vs 11,250 sqft)
    $1,738,510
  • 427 8th St, Wilmette, IL 60091
    3,866 sqft | $435/sqft | built 1910 | Similar size (3,866 vs 3,762 sqft); Similar age (1910 vs 1912); Similar lot size (10,500 vs 11,250 sqft)
    $1,680,000
  • 723 Laurel Ave, Wilmette, IL 60091
    4,048 sqft | $432/sqft | built 1914 | 8% larger (4,048 vs 3,762 sqft); Similar age (1914 vs 1912); Similar lot size (11,200 vs 11,250 sqft)
    $1,747,000

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

Down 5.2% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$1,696,250−$93,760−5.2%
2025$1,790,010+$550,000+44.4%
2024$1,240,010$00.0%
2023$1,240,010$00.0%
2022$1,240,010+$60,430+5.1%
2021$1,179,580+$14,120+1.2%
2020$1,165,460——
6-year total+$530,790+45.5%