Cook County Value

6147 Byron St Rosemont, IL 60018

3 bed / 1 bath, 1,175 sqft, built 1967, in Leyden Assessor market value for 2026: $422,310.

Cook County account 12042110560000

Assessor market value
$422,310
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,175 sqft
$359 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 60018 and Leyden assessment pages.

Local guide: Leyden Township 2026 Property Tax Appeal Guide.

Appeal deadlines

For Leyden, appeals to the Assessor closed . Board of Review dates for Leyden 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 4.0% from $440,000 in 2025 to $422,310 in 2026.
  • Assessor market value per square footThe current public record shows about $359 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Leyden neighborhood and ZIP 60018.
  • Neighborhood value signalAmong 503 residential records in the same neighborhood, the average assessor market value is about $240 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -1.8% on average.

Comparable assessments

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

  • 6014 N Emerson St Rosemont, IL 60018
    1,181 sqft | $338/sqft | built 1967 | Similar size (1,181 vs 1,175 sqft); Built same year (1967); Similar lot size (5,981 vs 5,935 sqft)
    $399,410
  • 6231 Byron St Rosemont, IL 60018
    1,175 sqft | $349/sqft | built 1967 | Similar size (1,175 vs 1,175 sqft); Built same year (1967); Similar lot size (5,799 vs 5,935 sqft)
    $410,310
  • 6209 Byron St Rosemont, IL 60018
    1,175 sqft | $357/sqft | built 1966 | Similar size (1,175 vs 1,175 sqft); Similar age (1966 vs 1967); Similar lot size (5,798 vs 5,935 sqft)
    $420,000
  • 5959 Ruby St Rosemont, IL 60018
    1,179 sqft | $314/sqft | built 1970 | Similar size (1,179 vs 1,175 sqft); Similar age (1970 vs 1967); Similar lot size (5,971 vs 5,935 sqft)
    $369,620
  • 5944 Ruby St Rosemont, IL 60018
    1,182 sqft | $347/sqft | built 1969 | Similar size (1,182 vs 1,175 sqft); Similar age (1969 vs 1967); Similar lot size (5,850 vs 5,935 sqft)
    $410,000

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

Value history

Down 4.0% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$422,310−$17,690−4.0%
2025$440,000$00.0%
2024$440,000+$185,740+73.1%
2020$254,260——
6-year total+$168,050+66.1%