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ZIP-level NFIRS data

Fires in ZIP 03820

ZIP 03820 recorded 360 fire and hazmat incidents in 2025, 2,023 across 2021–2025. Primary county: Strafford County, NH.

ZIP 03820 FIPS 33017 ZIP-level
Total incidents (2025)
360
2,023 across 5 years
Building fires
31
38 wildland
Wildfire risk
35
FEMA NRI · Low
Active fires
0
in Strafford County
01 Five-year trend

Year over year in ZIP 03820

2,023 incidents from 2021 through 2025 inside this ZIP.

YearIncidents 
2021 131
2022 429
2023 629
2024 474
2025 360
02 Seasonality

When do fires happen in ZIP 03820?

Jan peaks. Jun dips. Aggregated across all 5 years inside this ZIP.

Jan 322
Feb 130
Mar 196
Apr 217
May 148
Jun 116
Jul 131
Aug 139
Sep 120
Oct 166
Nov 147
Dec 191
03 Top incident types

What kinds of calls lead in ZIP 03820?

Top 5 NFIRS incident types for ZIP 03820 across 2021–2025.

#Incident typeCountShare 
1 Hazardous condition, other 573 28.3%
2 Power line down 320 15.8%
3 Building fires 166 8.2%
4 Gas leak (natural gas or LPG) 148 7.3%
5 Carbon monoxide incident 117 5.8%
04 Cause of ignition

What sparks fires in ZIP 03820?

For the 31 building fires reported here in 2025, here's how investigators classified ignition cause.

Unintentional
63%
165
Cause undetermined
18%
46
Intentional / arson
10%
25
Equipment / heat source failure
5%
12
Under investigation
3%
7
Act of nature (lightning)
1%
7
05 Where fires start

Where in the building fires start

NFIRS Area of Origin for ZIP 03820 fires across 2021–2025.

#Area of originCountShare 
1 Outside area, other 42 16.0%
2 Cooking area, kitchen 33 12.6%
3 Courtyard, patio, porch, terrace 29 11.1%
4 Engine area, running gear, wheel area 19 7.3%
5 Highway, parking lot, street: on or near 17 6.5%
6 Wildland, woods 14 5.3%
7 Open area - outside; included are farmland, field 12 4.6%
8 Undetermined 10 3.8%
9 All other areas 86 32.8%
06 What ignited it

The leading heat sources here

NFIRS HEAT_SOURC code — the physical thing that started the fire.

#Heat sourceCountShare 
1 Undetermined 71 27.1%
2 Cigarette 34 13.0%
3 Radiated, conducted heat from operating equipment 25 9.5%
4 Arcing 21 8.0%
5 Heat source: other 20 7.6%
6 Heat from powered equipment, other 20 7.6%
7 Hot ember or ash 10 3.8%
8 Heat from direct flame, convection currents 9 3.4%
9 All other sources 52 19.8%
07 The biggest fires

8 fires · $3.5M in losses

Largest single-incident losses in ZIP 03820 across 2021–2025. These 8 fires alone account for 296% of the ZIP's 2025 reported total.

#Property lossTypeYearSeverity
1 $1,381,100 Building fires 2023 Major
2 $500,000 Building fires 2022 Major
3 $500,000 Building fires 2025 Major
4 $376,200 Building fires 2024 Major
5 $300,000 Building fires 2025 Major
6 $200,000 Building fires 2022 Significant
7 $150,000 Building fires 2024 Significant
8 $130,410 Building fires 2023 Significant
08 Cities in this ZIP

Most active cities in ZIP 03820

Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 03820.

#City5-yr incidents 
1 Dover 2,013
2 Madbury 6
3 Rochester 1
11 Current conditions

Right now in 03820

The figures above are historical. For today's air quality, fire-weather warnings, and active fires, go to the official sources.

About ZIP-level data

NFIRS reports each fire incident with a 5-digit address ZIP. We aggregate those rows directly to produce ZIP-level totals — 2,023 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.