ZIP 20851 recorded 33 fire and hazmat incidents in 2025, 254 across 2021–2025. Primary county: Montgomery County, MD.
254 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 50 | |
| 2022 | 45 | |
| 2023 | 56 | |
| 2024 | 70 | |
| 2025 | 33 |
Jul peaks. Apr dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 20851 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Gas leak (natural gas or LPG) | 67 | 26.4% | |
| 2 | Power line down | 40 | 15.7% | |
| 3 | Electrical wiring/equipment problem, other | 26 | 10.2% | |
| 4 | Carbon monoxide incident | 24 | 9.4% | |
| 5 | Hazardous condition, other | 22 | 8.7% |
For the 3 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 20851 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Cooking area, kitchen | 9 | 20.5% | |
| 2 | Other | 4 | 9.1% | |
| 3 | Outside area, other | 4 | 9.1% | |
| 4 | Undetermined | 4 | 9.1% | |
| 5 | Bedroom - < 5 persons; included are jail or prison | 3 | 6.8% | |
| 6 | Function area, other | 2 | 4.5% | |
| 7 | Storage area, other | 2 | 4.5% | |
| 8 | Exterior balcony, unenclosed porch | 2 | 4.5% | |
| 9 | All other areas | 14 | 31.8% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 18 | 40.9% | |
| 2 | Heat source: other | 6 | 13.6% | |
| 3 | Hot ember or ash | 4 | 9.1% | |
| 4 | Radiated, conducted heat from operating equipment | 3 | 6.8% | |
| 5 | Arcing | 3 | 6.8% | |
| 6 | Hot or smoldering object, other | 2 | 4.5% | |
| 7 | Heat from powered equipment, other | 1 | 2.3% | |
| 8 | Spark, ember or flame from operating equipment | 1 | 2.3% | |
| 9 | All other sources | 6 | 13.6% |
Largest single-incident losses in ZIP 20851 across 2021–2025. These 8 fires alone account for 445% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $100,000 | Building fires | 2024 | Significant |
| 2 | $75,000 | Building fires | 2022 | Significant |
| 3 | $50,000 | Building fires | 2021 | Significant |
| 4 | $50,000 | Building fires | 2024 | Significant |
| 5 | $50,000 | Building fires | 2025 | Significant |
| 6 | $50,000 | Building fires | 2025 | Significant |
| 7 | $40,000 | Building fires | 2022 | Significant |
| 8 | $30,000 | Building fires | 2023 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 20851.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Rockville | 253 | |
| 2 | Silver Spring | 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 — 254 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.