ZIP 50538 is served primarily by Calhoun County, IA — including Rockwell City. ZIP-level data is sparse — showing the Calhoun County aggregate.
Oct peaks. Jan dips. ZIP-level seasonality is sparse — this is the county aggregate.
Top 5 NFIRS incident types — county-level breakdown.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Building fires | 7 | 15.2% | |
| 2 | Off-road vehicle or heavy equipment fire | 7 | 15.2% | |
| 3 | Grass fire | 7 | 15.2% | |
| 4 | Cooking fire, confined to container | 4 | 8.7% | |
| 5 | Passenger vehicle fire | 3 | 6.5% |
4 cities sit in Calhoun County. Click for the per-city NFIRS profile.
| # | City | Population | 2025 incidents | Building fires | Grade |
|---|---|---|---|---|---|
| 1 | Rockwell City | 2,389 | 16 | 2 | A |
| 2 | Lake City | 1,745 | 17 | 1 | A- |
| 3 | Manson | 1,718 | 3 | 1 | A+ |
| 4 | Pomeroy | 527 | 6 | 1 | B |
Some ZIPs span multiple counties. The primary above is the largest by population weight; secondary counties are below.
| County | State | Weight | |
|---|---|---|---|
| Webster County | IA | 0.50 | FIPS 19187 |
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 Calhoun 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.