Cook County Value

3800 S Union Ave, Chicago, IL 60609

3 bed / 1 bath, 1,260 sqft, built 1888, in South Chicago. Assessor market value for 2025: $502,720.

Cook County account 17333220220000

Assessor market value
$502,720
Tax year 2025 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,260 sqft
$399 per sqft
Year built
1888
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 60609 and South Chicago assessment pages.

Appeal deadlines

South Chicago 2026 appeal dates 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 $502,720 in 2024 to $502,720 in 2025.
  • Assessor market value per square footThe current public record shows about $399 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the South Chicago neighborhood and ZIP 60609.
  • Neighborhood value signalAmong 3,475 residential records in the same neighborhood, the average assessor market value is about $273 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values stayed about flat on average.

Comparable assessments

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

  • 547 W 32nd St, Chicago, IL 60616
    1,260 sqft | $286/sqft | built 1888 | Similar size (1,260 vs 1,260 sqft); Built same year (1888); Similar lot size (2,834 vs 2,728 sqft)
    $360,000
  • 548 W 32nd St, Chicago, IL 60616
    1,260 sqft | $238/sqft | built 1883 | Similar size (1,260 vs 1,260 sqft); Similar age (1883 vs 1888); Similar lot size (2,736 vs 2,728 sqft)
    $300,000
  • 550 W 32nd St, Chicago, IL 60616
    1,260 sqft | $262/sqft | built 1883 | Similar size (1,260 vs 1,260 sqft); Similar age (1883 vs 1888); Similar lot size (2,736 vs 2,728 sqft)
    $330,000
  • 550 W 37th St, Chicago, IL 60609
    1,260 sqft | $262/sqft | built 1888 | Similar size (1,260 vs 1,260 sqft); Built same year (1888); Similar lot size (2,500 vs 2,728 sqft)
    $330,000
  • 522 W 29th St, Chicago, IL 60616
    1,260 sqft | $254/sqft | built 1888 | Similar size (1,260 vs 1,260 sqft); Built same year (1888); Similar lot size (2,792 vs 2,728 sqft)
    $320,010

Recent comparable sales

Sales selected by similarity to the subject property.

Public appraisal comparison for 2025. 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 4.7% in 2025 from 2024.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2025$502,720+$22,720+4.7%
2024$480,000+$190,000+65.5%
2023$290,000$00.0%
2022$290,000$00.0%
2021$290,000+$43,470+17.6%
2020$246,530——
5-year total+$256,190+103.9%