ZIP 21770 recorded 39 fire and hazmat incidents in 2025, 175 across 2021–2025. Primary county: Frederick County, MD.
175 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 39 | |
| 2022 | 41 | |
| 2023 | 29 | |
| 2024 | 27 | |
| 2025 | 39 |
Mar peaks. Jan dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 21770 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Power line down | 25 | 14.3% | |
| 2 | Building fires | 19 | 10.9% | |
| 3 | Gas leak (natural gas or LPG) | 16 | 9.1% | |
| 4 | Arcing, shorted electrical equipment | 14 | 8.0% | |
| 5 | Brush, or brush and grass mixture fire | 10 | 5.7% |
For the 3 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 21770 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Engine area, running gear, wheel area | 8 | 29.6% | |
| 2 | Vehicle storage area; garage, carport | 3 | 11.1% | |
| 3 | Undetermined | 3 | 11.1% | |
| 4 | Storage area, other | 2 | 7.4% | |
| 5 | Open area - outside; included are farmland, field | 2 | 7.4% | |
| 6 | Other | 1 | 3.7% | |
| 7 | Common room, den, family room, living room, lounge | 1 | 3.7% | |
| 8 | Cooking area, kitchen | 1 | 3.7% | |
| 9 | All other areas | 6 | 22.2% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 8 | 29.6% | |
| 2 | Heat source: other | 6 | 22.2% | |
| 3 | Heat from powered equipment, other | 5 | 18.5% | |
| 4 | Spark, ember or flame from operating equipment | 3 | 11.1% | |
| 5 | Radiated, conducted heat from operating equipment | 2 | 7.4% | |
| 6 | Arcing | 1 | 3.7% | |
| 7 | Cigarette lighter | 1 | 3.7% | |
| 8 | Backfire from internal combustion engine | 1 | 3.7% |
Largest single-incident losses in ZIP 21770 across 2021–2025. These 8 fires alone account for 329% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $100,000 | Building fires | 2021 | Significant |
| 2 | $100,000 | Road freight or transport vehicle fire | 2025 | Significant |
| 3 | $70,000 | Building fires | 2022 | Significant |
| 4 | $54,000 | Road freight or transport vehicle fire | 2023 | Significant |
| 5 | $15,000 | Building fires | 2022 | Significant |
| 6 | $10,000 | Passenger vehicle fire | 2024 | Significant |
| 7 | $10,000 | Building fires | 2025 | Significant |
| 8 | $5,000 | Building fires | 2021 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 21770.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Monrovia | 162 | |
| 2 | Mount Airy | 1 | |
| 3 | New Market | 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 — 175 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.