Cook County Value

621 Thornwood Ln Northfield, IL 60093

6 bed / 3 bath, 3,558 sqft, built 1967, in Northfield. Assessor market value for 2026: $1,390,000.

Cook County account 04241010700000

Assessor market value
$1,390,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,558 sqft
$391 per sqft
Year built
1967
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 60093 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 stayed about the same, from $1,390,000 in 2025 to $1,390,000 in 2026.
  • Assessor market value per square footThe current public record shows about $391 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 60093.
  • Neighborhood value signalAmong 1,262 residential records in the same neighborhood, the average assessor market value is about $367 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -0.1% on average.

Comparable assessments

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

  • 4 Steeple Chase Ln Northfield, IL 60093
    3,362 sqft | $387/sqft | built 1972 | 6% smaller (3,362 vs 3,558 sqft); Similar age (1972 vs 1967); Similar lot size (51,836 vs 52,969 sqft)
    $1,300,000
  • 250 Maple Row Northfield, IL 60093
    3,532 sqft | $388/sqft | built 1953 | Similar size (3,532 vs 3,558 sqft); Similar lot size (53,187 vs 52,969 sqft); Same quality (Average)
    $1,370,000
  • 2031 E Burr Oak Dr, Glenview, IL 60025
    3,428 sqft | $420/sqft | built 1954 | Similar size (3,428 vs 3,558 sqft); Similar lot size (53,282 vs 52,969 sqft); Same quality (Average)
    $1,440,000
  • 285 Maple Row Northfield, IL 60093
    3,357 sqft | $413/sqft | built 1957 | 6% smaller (3,357 vs 3,558 sqft); Similar lot size (53,187 vs 52,969 sqft); Same quality (Average)
    $1,386,520
  • 2100 Burr Oak Dr, Glenview, IL 60025
    3,608 sqft | $352/sqft | built 1964 | Similar size (3,608 vs 3,558 sqft); Similar age (1964 vs 1967); Lot 18% smaller (43,616 vs 52,969 sqft)
    $1,270,000

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

No change in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$1,390,000$00.0%
2025$1,390,000+$288,270+26.2%
2024$1,101,730——
2-year total+$288,270+26.2%