Home Insurance in South Wilmington, Illinois
With a median home value of $174,400, South Wilmington is 36% lower than the Grundy County median.
Aging wiring, roofing and plumbing in older homes can push up the cost to insure or rebuild them. The typical home in South Wilmington was built around 1959. About 52% of homes were built before 1960, about 32 points above Grundy County's 20%.
In South Wilmington, the housing stock is 95% single-family homes.
In South Wilmington, about 50% of owner-occupied homes have a mortgage - lenders require hazard insurance on every mortgaged home.
South Wilmington has an owner-occupancy rate of 90% and a vacancy rate of 5%; unoccupied homes typically need a different coverage form.
In South Wilmington, 88% of homes are primarily heated with natural gas.
Grundy County had 167 active NFIP flood policies as of September 2026. Its top FEMA-rated hazard is tornado (Relatively Moderate). See the full Grundy County home insurance overview for all FEMA hazard ratings and flood coverage details.
According to the NAIC homeowners insurance report (2023 data), a standard HO-3 homeowners policy in Illinois carries a statewide average premium of $1,480 per year.
Key figures
| Median home value | $174,400 |
|---|---|
| Median year built | 1959 |
| Owner-occupied share | 90% |
| Share of owner-occupied homes with a mortgage | 50% |
| Top county hazard | Tornado (Relatively Moderate) |
| Active NFIP policies in Grundy County | 167 |
| Home insurance premium | $1,480 - statewide average (NAIC, 2023 data) |
Nearby towns
Sources
Data last updated: 2026-09-29
- U.S. Census Bureau Gazetteer Files (2024)
- U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates (2024)
- FEMA National Risk Index (December 2025)
- FEMA OpenFEMA NFIP Redacted Policies v3 (2026)
- NAIC Dwelling Fire, Homeowners Owner-Occupied, and Homeowners Tenant and Condominium/Cooperative Unit Owners Insurance: Data for 2023 (published 2026) (2023)