ZIP 51340 is served primarily by Clay County, IA — including Spencer. ZIP-level data is sparse — showing the Clay County aggregate.
Apr peaks. Jun dips. ZIP-level seasonality is sparse — this is the county aggregate.
Top 5 NFIRS incident types — county-level breakdown.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Gas leak (natural gas or LPG) | 25 | 16.0% | |
| 2 | Grass fire | 20 | 12.8% | |
| 3 | Building fires | 19 | 12.2% | |
| 4 | Vehicle accident, general cleanup | 15 | 9.6% | |
| 5 | Brush, or brush and grass mixture fire | 14 | 9.0% |
3 cities sit in Clay County. Click for the per-city NFIRS profile.
The figures above are historical. For today's air quality, fire-weather warnings, and active fires, go to the official sources.
This ZIP doesn't have enough NFIRS coverage on its own (under 10 reported incidents across 2021–2025) to publish ZIP-level statistics, so we're showing the Clay County aggregate above. NFIRS reporting is voluntary and many rural ZIPs roll up to broader county totals. The ZIP-to-county mapping uses SimpleMaps' uscities.zips dataset.