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Oswego, Kendall County, Illinois
Property Tax Rate
2.68% effective rate on market value
Official composite rate: 8.0443% per $100 EAV
State equalization factor: 1.0000
2024 District Rates by Taxcode, tax code OS007 (14 of 22 in-village tax codes — clearly dominant); a smaller share (5 of 22) falls in CUSD 115 at a nearly identical rate, so not split out
School Districts
Assigned district: Oswego Community Unit School District 308
Oswego Community Unit School District 308
Enrollment: 16,601 · Per-pupil spending: $16,434
| ELA proficiency | 58.2% | Near State Average |
| Math proficiency | 43.6% | Near State Average |
| ACT ELA proficiency | 59.0% | Near State Average |
| ACT Math proficiency | 46.2% | Near State Average |
| 4-year graduation rate | 95.5% | Near State Average |
| Chronic absenteeism | 20.0% | Near State Average |
Kendall County Market Momentum
Median list price
$445,000
Median $/sqft
$201
Median days on market
30
Source: FRED (Realtor.com series), as of 2026-06-01. County-level — the finest granularity FRED publishes.
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