Cook County townships ranked: assessment increases and appeal results
Cook County sets assessments and appeal windows township by township, and the spread between them is wide. At their latest reassessments the median home in New Trier Township moved +32.4% and the median home in North Chicago Township +4.8% — the widest gap in the county on the records we hold. Appeals also don’t land the same way everywhere: in tax year 2025 the Board of Review cut the value on 69.0% of residential appeals from Hanover Township, the highest share of any township that year. Ranked below by the latest reassessment change.
| Township | Region | Latest reassessment: median change | Residential appeals, latest year | Share changed / decreased | Filing window |
|---|---|---|---|---|---|
| New Trier | North | 2025: +32.4% | 28,319 | 28.4% / 50.5% | Closes 22 Jun 2026 |
| Palatine | North | 2025: +30.2% | 44,816 | 15.4% / 57.1% | Closes 04 Nov 2026 |
| Schaumburg | North | 2025: +28.6% | 43,430 | 11.2% / 68.5% | Not published |
| Wheeling | North | 2025: +27.5% | 62,276 | 13.6% / 52.8% | Closes 22 Oct 2026 |
| Northfield | North | 2025: +27.4% | 43,176 | 20.6% / 57.3% | Closes 04 Sep 2026 |
| Hanover | North | 2025: +27.3% | 23,042 | 11.9% / 69.0% | Not published |
| Lemont | South | 2026: +26.0% | 3,492 | 15.7% / 30.5% | Closes 29 Sep 2026 |
| Elk Grove | North | 2025: +25.9% | 32,282 | 10.5% / 62.6% | Closes 04 Aug 2026 |
| Barrington | North | 2025: +25.8% | 6,690 | 24.9% / 51.6% | Closes 23 Sep 2026 |
| River Forest | South | 2026: +25.8% | 1,915 | 18.2% / 37.6% | Closes 02 Jun 2026 |
| Rogers Park | City | 2024: +25.6% | 5,888 | 10.8% / 25.4% | Closes 01 Jun 2026 |
| Lake | City | 2024: +25.0% | 19,383 | 13.2% / 49.6% | Closes 29 Oct 2026 |
| Lyons | South | 2026: +24.7% | 12,200 | 10.0% / 35.7% | Closes 03 Sep 2026 |
| Berwyn | South | 2026: +23.7% | 5,391 | 12.1% / 40.9% | Closes 06 Jul 2026 |
| Maine | North | 2025: +23.6% | 48,809 | 21.7% / 48.0% | Closes 21 Jul 2026 |
| Palos | South | 2026: +23.3% | 5,773 | 13.2% / 28.4% | Closes 17 Jul 2026 |
| Oak Park | South | 2026: +22.9% | 6,679 | 14.0% / 38.4% | Closes 18 Jun 2026 |
| Worth | South | 2026: +21.7% | 11,482 | 12.3% / 37.1% | Closes 15 Oct 2026 |
| Riverside | South | 2026: +21.4% | 1,944 | 21.6% / 36.5% | Closes 08 Jun 2026 |
| Stickney | South | 2026: +20.0% | 2,908 | 8.8% / 42.7% | Closes 12 Aug 2026 |
| Cicero | South | 2026: +19.6% | 3,453 | 14.6% / 49.8% | Closes 31 Jul 2026 |
| Hyde Park | City | 2024: +19.5% | 13,262 | 15.6% / 27.4% | Closes 08 Oct 2026 |
| Leyden | North | 2025: +19.5% | 18,609 | 20.9% / 52.8% | Closes 14 Oct 2026 |
| Bremen | South | 2026: +19.2% | 8,904 | 11.1% / 36.2% | Closes 24 Sep 2026 |
| Niles | North | 2025: +18.9% | 38,515 | 22.9% / 56.2% | Not published |
| Lake View | City | 2024: +18.8% | 35,074 | 9.9% / 21.8% | Closes 13 Jul 2026 |
| Jefferson | City | 2024: +18.6% | 42,353 | 12.6% / 42.3% | Not published |
| Evanston | North | 2025: +18.3% | 24,101 | 17.7% / 36.5% | Closes 04 Jun 2026 |
| Proviso | South | 2026: +18.2% | 11,265 | 11.2% / 39.4% | Closes 27 Oct 2026 |
| West Chicago | City | 2024: +17.6% | 38,052 | 14.4% / 26.5% | Closes 21 Aug 2026 |
| Norwood Park | North | 2025: +15.2% | 7,113 | 15.3% / 57.4% | Closes 26 May 2026 |
| Calumet | South | 2026: +8.3% | 918 | 13.6% / 41.3% | Closes 02 Oct 2026 |
| South Chicago | City | 2024: +7.6% | 42,434 | 3.2% / 16.4% | Not published |
| North Chicago | City | 2024: +4.8% | 55,583 | 9.1% / 12.5% | Not published |
| Bloom (thin) | South | Not yet measurable | 5,040 | 11.2% / 41.9% | Not published |
| Orland | South | Not yet measurable | 10,930 | 9.4% / 33.1% | Closes 06 Nov 2026 |
| Rich (thin) | South | Not yet measurable | 6,662 | 10.6% / 38.3% | Not published |
| Thornton (thin) | South | Not yet measurable | 11,536 | 12.0% / 42.4% | Not published |
Median change compares each class-2 property’s mailed value with its own value the year before; only years with at least 1,000 such properties and a shift of at least 2% count as a reassessment. “Share changed / decreased” is the latest tax year with at least 30 closed residential appeals at both the Assessor and the Board of Review. Filing windows are printed only from dates we verified against the offices’ own calendars.
3 townships are marked (thin): Bloom, Rich, Thornton. We hold their appeal counts but not yet a reassessment change or a verified filing window, so those pages carry less than the rest and we don’t ask search engines to rank them.
How a Cook County assessment appeal works · everything we hold on property · how we compute these figures