Home insurance & natural hazards in Williamson County, TN
Calm, plain facts for homeowners in Williamson County: what neighbors have paid for coverage, what flood insurance costs, and which weather hazards matter most here.
- Typical premiums from U.S. Treasury insurance data
- Flood insurance costs from 1,328 FEMA NFIP policies
- 14 natural hazards rated by the FEMA National Risk Index
Historical averages, not a quote. Updated Oct 2026.
Williamson at a glance
Four numbers most homeowners ask about first.
Per policy per year in 2022, median of 10 ZIP codes (inflation-adjusted).
Average full cost of a single-family NFIP policy that took effect in 2025.
Share of policies insurers chose not to renew in 2022, median ZIP. Typical U.S. ZIP: 0.81%.
Overall National Risk Index rating, higher than 85.1% of U.S. counties.
What homeowners here pay
Each block pairs a short explanation with the data behind it.
Homeowners insurance
Typical premiums in Williamson County were $2,443 per policy in 2022, 46% above the typical Tennessee ZIP code ($1,677) and 57% above the typical U.S. ZIP code ($1,551). After adjusting for inflation, local premiums rose 10% between 2018 and 2022.
Typical premium per policy
Flood insurance
Standard home policies don't cover floods. The average single-family NFIP policy that took effect here in 2025 cost $1,295, compared with $1,052 in 2022. About 53% of local policies are for homes in high-risk A or V zones and 47% in moderate- to lower-risk zones.
Average flood policy cost
Policies by flood zone, 2025
Natural hazards
Bars show how Williamson compares with every U.S. county for each hazard (100 = highest). Cold wave, earthquake and strong wind rank highest here. A high rank doesn't mean an event is likely in any given year. It shows where preparation and the right coverage matter most.
Hazard risk, national percentile
Compare nearby
Neighboring counties
| County | Premium | Nonrenewal | Flood |
|---|---|---|---|
| Williamson County | $2,443 | 0.95% | $1,295 |
| Rutherford County | $1,883 | 1.21% | $1,194 |
| Dickson County | $1,818 | 0.98% | $1,258 |
| Cheatham County | $1,780 | 1.03% | $1,542 |
| Davidson County | $1,760 | 1.30% | $1,303 |
| Maury County | $1,745 | 1.11% | $1,289 |
| Hickman County | $1,726 | 0.82% | $1,754 |
| Marshall County | $1,600 | 0.98% | $1,411 |
ZIP code pages in Williamson County
Practical next steps
Simple things Williamson homeowners can do with this information.
Historical averages, not a quote. Homeowners figures are inflation-adjusted averages from the U.S. Treasury Federal Insurance Office "Supporting Underlying Metrics" (2018–2022, published January 2025). They cover HO-3/HO-5 policies from participating private insurers and exclude state residual-market plans (such as FAIR plans and Citizens), surplus-lines and flood coverage. Treasury notes that individual ZIP codes can contain data anomalies. Your price depends on your home, coverage and insurer.
Sources: U.S. Treasury FIO; FEMA OpenFEMA NFIP Redacted Policies v3 (data as of Sep 8, 2026); FEMA National Risk Index (December 2025); U.S. Census Bureau ZCTA-to-county relationship file (2020) and county adjacency file; GeoNames place names. How we calculate these numbers.
This product uses the FEMA OpenFEMA API and National Risk Index data, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s). SafeHomeFacts is independent and not affiliated with the U.S. Treasury, FEMA or any insurer.