ZIP 20855 recorded 66 fire and hazmat incidents in 2025, 334 across 2021–2025. Primary county: Montgomery County, MD.
334 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 58 | |
| 2022 | 70 | |
| 2023 | 66 | |
| 2024 | 74 | |
| 2025 | 66 |
Mar peaks. May dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 20855 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Gas leak (natural gas or LPG) | 55 | 16.5% | |
| 2 | Power line down | 36 | 10.8% | |
| 3 | Hazardous condition, other | 35 | 10.5% | |
| 4 | Trash or rubbish fire, contained | 21 | 6.3% | |
| 5 | Passenger vehicle fire | 20 | 6.0% |
For the 1 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 20855 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Engine area, running gear, wheel area | 16 | 15.1% | |
| 2 | Cooking area, kitchen | 12 | 11.3% | |
| 3 | Outside area, other | 10 | 9.4% | |
| 4 | Other | 9 | 8.5% | |
| 5 | Chute/container - trash, rubbish, waste | 9 | 8.5% | |
| 6 | Vehicle area, other | 6 | 5.7% | |
| 7 | Open area - outside; included are farmland, field | 5 | 4.7% | |
| 8 | Wildland, woods | 5 | 4.7% | |
| 9 | All other areas | 34 | 32.1% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 46 | 43.4% | |
| 2 | Hot or smoldering object, other | 9 | 8.5% | |
| 3 | Heat from powered equipment, other | 7 | 6.6% | |
| 4 | Radiated, conducted heat from operating equipment | 7 | 6.6% | |
| 5 | Hot ember or ash | 7 | 6.6% | |
| 6 | Spark, ember or flame from operating equipment | 5 | 4.7% | |
| 7 | Arcing | 5 | 4.7% | |
| 8 | Heat source: other | 4 | 3.8% | |
| 9 | All other sources | 16 | 15.1% |
Largest single-incident losses in ZIP 20855 across 2021–2025. These 8 fires alone account for 992% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $500,000 | Off-road vehicle or heavy equipment fire | 2024 | Major |
| 2 | $400,000 | Building fires | 2023 | Major |
| 3 | $100,000 | Building fires | 2021 | Significant |
| 4 | $75,000 | Building fires | 2024 | Significant |
| 5 | $75,000 | Building fires | 2025 | Significant |
| 6 | $25,000 | Mobile property (vehicle) fire, other | 2024 | Significant |
| 7 | $25,000 | Fires in structures other than in a building | 2024 | Significant |
| 8 | $20,000 | Building fires | 2021 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 20855.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Derwood | 321 | |
| 2 | Rockville | 7 | |
| 3 | Accokeek | 2 | |
| 4 | Silver Spring | 2 | |
| 5 | Olney | 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 — 334 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.