Cook County Value

13100 Derby Rd Lemont, IL 60439

3 bed / 2 bath, 1,562 sqft, built 1947, in Lemont. Assessor market value for 2026: $520,000.

Cook County account 22343000090000

Likely too high

about $100,000

8 similar homes nearby point to a value about $100,000 lower than yours.

Assessor market value$520,000
Similar homes$419,709
$100,291 gap · bars start at $0

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

Assessor market value
$520,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,562 sqft
$333 per sqft
Year built
1947
Average quality

Why we think so

Similar homes' assessments

Strong

7 of 8 similar homes are assessed lower per square foot. Their similarity-weighted median is $264.52/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 $214,660. Counting your land in place of theirs where theirs is less, they support a value of $419,709.

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 increased 11.7% from $465,420 in 2025 to $520,000 in 2026.
  • Assessor market value per square footThe current public record shows about $333 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 2,806 residential records in the same neighborhood, the average assessor market value is about $255 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +30.4% on average.

Comparable assessments

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

  • 12919 Archer Ave Lemont, IL 60439
    1,550 sqft | $265/sqft | built 1948 | Similar size (1,550 vs 1,562 sqft); Similar age (1948 vs 1947); Similar lot size (46,609 vs 48,787 sqft)
    $410,000
  • 15240 129th St Lemont, IL 60439
    1,580 sqft | $253/sqft | built 1947 | Similar size (1,580 vs 1,562 sqft); Built same year (1947); Similar lot size (51,400 vs 48,787 sqft)
    $400,000
  • 12425 S Archer Ave Lemont, IL 60439
    1,610 sqft | $211/sqft | built 1959 | Similar size (1,610 vs 1,562 sqft); Similar lot size (48,787 vs 48,787 sqft); Same quality (Average)
    $340,000
  • 12917 Archer Ave Lemont, IL 60439
    1,440 sqft | $312/sqft | built 1945 | 8% smaller (1,440 vs 1,562 sqft); Similar age (1945 vs 1947); Similar lot size (51,405 vs 48,787 sqft)
    $450,000
  • 12494 Spyglass Ct Lemont, IL 60439
    1,600 sqft | $262/sqft | built 1958 | Similar size (1,600 vs 1,562 sqft); Lot 14% smaller (42,078 vs 48,787 sqft); Same quality (Average)
    $420,000

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 11.7% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$520,000+$54,580+11.7%
2025$465,420$00.0%
2024$465,420$00.0%
2023$465,420+$214,340+85.4%
2022$251,080−$22,060−8.1%
2021$273,140+$100.0%
2020$273,130——
6-year total+$246,870+90.4%