ZIP 37921 recorded 158 fire and hazmat incidents in 2025, 1,065 across 2021–2025. Primary county: Knox County, TN. FEMA NRI rates wildfire risk here as High.
1,065 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 170 | |
| 2022 | 269 | |
| 2023 | 244 | |
| 2024 | 224 | |
| 2025 | 158 |
Jul peaks. Oct dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 37921 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Outside rubbish, trash or waste fire | 149 | 14.0% | |
| 2 | Brush, or brush and grass mixture fire | 100 | 9.4% | |
| 3 | Building fires | 91 | 8.5% | |
| 4 | Outside rubbish fire, other | 84 | 7.9% | |
| 5 | Passenger vehicle fire | 79 | 7.4% |
For the 9 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 37921 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Outside area, other | 85 | 20.3% | |
| 2 | Engine area, running gear, wheel area | 66 | 15.8% | |
| 3 | Cooking area, kitchen | 44 | 10.5% | |
| 4 | Undetermined | 39 | 9.3% | |
| 5 | Open area - outside; included are farmland, field | 26 | 6.2% | |
| 6 | Highway, parking lot, street: on or near | 16 | 3.8% | |
| 7 | Wildland, woods | 15 | 3.6% | |
| 8 | Other | 14 | 3.3% | |
| 9 | All other areas | 114 | 27.2% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 225 | 53.7% | |
| 2 | Heat source: other | 33 | 7.9% | |
| 3 | Heat from powered equipment, other | 28 | 6.7% | |
| 4 | Fireworks | 17 | 4.1% | |
| 5 | Hot or smoldering object, other | 16 | 3.8% | |
| 6 | Radiated, conducted heat from operating equipment | 15 | 3.6% | |
| 7 | Arcing | 13 | 3.1% | |
| 8 | Hot ember or ash | 11 | 2.6% | |
| 9 | All other sources | 61 | 14.6% |
Largest single-incident losses in ZIP 37921 across 2021–2025. These 8 fires alone account for 401% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $354,500 | Fires in structures other than in a building | 2023 | Major |
| 2 | $300,000 | Outside equipment fire | 2024 | Major |
| 3 | $300,000 | Building fires | 2024 | Major |
| 4 | $275,000 | Building fires | 2023 | Major |
| 5 | $200,000 | Fire, other | 2025 | Significant |
| 6 | $171,000 | Building fires | 2022 | Significant |
| 7 | $162,000 | Building fires | 2024 | Significant |
| 8 | $160,000 | Building fires | 2023 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 37921.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Knoxville | 955 |
The figures above are historical. For today's air quality, fire-weather warnings, and active fires, go to the official sources.
NFIRS reports each fire incident with a 5-digit address ZIP. We aggregate those rows directly to produce ZIP-level totals — 1,065 incidents in this ZIP across 2021–2025. Building-fire breakdowns (Area of Origin, Heat Source, ignition cause) only count fires investigators classified beyond the basic incident report. Because NFIRS reporting is voluntary, totals are a strong indicator rather than a complete census.