ZIP 37866 recorded 33 fire and hazmat incidents in 2025, 113 across 2021–2025. Primary county: Union County, TN. FEMA NRI rates wildfire risk here as Moderate.
113 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 16 | |
| 2022 | 26 | |
| 2023 | 23 | |
| 2024 | 15 | |
| 2025 | 33 |
Mar peaks. Jun dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 37866 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Building fires | 23 | 20.4% | |
| 2 | Brush, or brush and grass mixture fire | 17 | 15.0% | |
| 3 | Authorized controlled burning | 12 | 10.6% | |
| 4 | Passenger vehicle fire | 9 | 8.0% | |
| 5 | Forest, woods or wildland fire | 9 | 8.0% |
For the 9 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 37866 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 16 | 23.9% | |
| 2 | Open area - outside; included are farmland, field | 14 | 20.9% | |
| 3 | Engine area, running gear, wheel area | 7 | 10.4% | |
| 4 | Outside area, other | 5 | 7.5% | |
| 5 | Wildland, woods | 5 | 7.5% | |
| 6 | Common room, den, family room, living room, lounge | 3 | 4.5% | |
| 7 | Bedroom - < 5 persons; included are jail or prison | 3 | 4.5% | |
| 8 | Courtyard, patio, porch, terrace | 3 | 4.5% | |
| 9 | All other areas | 11 | 16.4% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 42 | 62.7% | |
| 2 | Hot ember or ash | 9 | 13.4% | |
| 3 | Arcing | 4 | 6.0% | |
| 4 | Heat spread from another fire, other | 3 | 4.5% | |
| 5 | Heat from powered equipment, other | 2 | 3.0% | |
| 6 | Radiated, conducted heat from operating equipment | 2 | 3.0% | |
| 7 | Hot or smoldering object, other | 1 | 1.5% | |
| 8 | Explosive, fireworks, other | 1 | 1.5% | |
| 9 | All other sources | 3 | 4.5% |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 37866.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Friendsville | 1 | |
| 2 | Maynardville | 1 |
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 — 113 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.