Cook County Value

15420 127th St Lemont, IL 60439

4 bed / 2 bath, 1,871 sqft, built 1952, in Lemont. Assessor market value for 2026: $530,000.

Cook County account 22322000260000

In line with similar homes

8 similar homes nearby support a value at or above your county value.

Assessor market value$530,000
Similar homes$544,348
No gap: similar homes are at or above the county value · bars start at $0

How sure: High · 8 similar homes (5 shown below) · public records only

Assessor market value
$530,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,871 sqft
$283 per sqft
Year built
1952
Average quality

What we found

Similar homes' assessments

Weak

3 of 8 similar homes are assessed lower per square foot. Their similarity-weighted median is $287.05/sqft, but land is valued apart from the home, and some of them have less land value per square foot of home than yours, which counts as $73,380. Counting your land in place of theirs where theirs is less, they support a value of $544,348.

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 60439 and Lemont assessment pages.

Local guide: Lemont Township 2026 Property Tax Appeal Guide.

Appeal deadlines

For Lemont, appeals to the Assessor closed . Board of Review dates for Lemont 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 changed from $291,840 in 2025 to $530,000 in 2026. A change this large often reflects new construction, a reclassification or a record correction, so check it against the county record.
  • Assessor market value per square footThe current public record shows about $283 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Lemont neighborhood and ZIP 60439.
  • Neighborhood value signalAmong 278 residential records in the same neighborhood, the average assessor market value is about $298 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +39.8% on average.

Comparable assessments

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

  • 1261 State St Lemont, IL 60439
    1,906 sqft | $278/sqft | built 1967 | Similar size (1,906 vs 1,871 sqft); Similar lot size (39,291 vs 36,690 sqft); Same quality (Average)
    $530,000
  • 15511 129th St Lemont, IL 60439
    1,776 sqft | $304/sqft | built 1965 | 5% smaller (1,776 vs 1,871 sqft); Similar lot size (33,279 vs 36,690 sqft); Same quality (Average)
    $540,000
  • 16047 135th St Lemont, IL 60439
    1,498 sqft | $287/sqft | built 1954 | Similar age (1954 vs 1952); Similar lot size (36,067 vs 36,690 sqft); Same quality (Average)
    $430,000
  • 13325 Archer Ave Lemont, IL 60439
    1,803 sqft | $283/sqft | built 1965 | Similar size (1,803 vs 1,871 sqft); Same quality (Average); Same neighborhood
    $510,000
  • 1349 State St Lemont, IL 60439
    1,699 sqft | $288/sqft | built 1953 | 9% smaller (1,699 vs 1,871 sqft); Similar age (1953 vs 1952); Same quality (Average)
    $490,000

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

Up 81.6% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$530,000+$238,160+81.6%
2025$291,840$00.0%
2024$291,840−$78,160−21.1%
2023$370,000+$69,340+23.1%
2022$300,660$00.0%
2021$300,660+$100.0%
2020$300,650——
6-year total+$229,350+76.3%