ZIP 03866 is served primarily by Strafford County, NH — including Dover. ZIP-level data is sparse — showing the Strafford County aggregate.
Sep peaks. Nov dips. ZIP-level seasonality is sparse — this is the county aggregate.
Top 5 NFIRS incident types — county-level breakdown.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Hazardous condition, other | 78 | 15.7% | |
| 2 | Building fires | 64 | 12.9% | |
| 3 | Unauthorized burning | 60 | 12.1% | |
| 4 | Gas leak (natural gas or LPG) | 51 | 10.3% | |
| 5 | Power line down | 45 | 9.1% |
13 cities sit in Strafford County. Click for the per-city NFIRS profile.
| # | City | Population | 2025 incidents | Building fires | Grade |
|---|---|---|---|---|---|
| 1 | Dover | 32,849 | 359 | 31 | B |
| 2 | Rochester | 32,573 | 11 | 11 | B+ |
| 3 | Durham | 15,073 | 120 | 15 | A- |
| 4 | Somersworth | 11,994 | 159 | 14 | C+ |
| 5 | Barrington | 9,339 | 94 | 18 | A- |
| 6 | Farmington | 6,762 | 126 | 23 | B- |
| 7 | Lee | 4,547 | 90 | 1 | B- |
| 8 | Milton | 4,509 | 81 | 17 | C+ |
| 9 | Strafford | 4,261 | 25 | 1 | B+ |
| 10 | New Durham | 2,711 | 44 | 1 | B |
| 11 | Rollinsford | 2,597 | 18 | 2 | C |
| 12 | Madbury | 2,213 | 36 | 2 | B- |
| 13 | Middleton | 1,537 | 12 | 4 | A- |
The figures above are historical. For today's air quality, fire-weather warnings, and active fires, go to the official sources.
This ZIP doesn't have enough NFIRS coverage on its own (under 10 reported incidents across 2021–2025) to publish ZIP-level statistics, so we're showing the Strafford County aggregate above. NFIRS reporting is voluntary and many rural ZIPs roll up to broader county totals. The ZIP-to-county mapping uses SimpleMaps' uscities.zips dataset.