ZIP 08561 is served primarily by Mercer County, NJ — including Hamilton. ZIP-level data is sparse — showing the Mercer County aggregate. FEMA NRI rates wildfire risk here as High.
Jun peaks. Dec dips. ZIP-level seasonality is sparse — this is the county aggregate.
Top 5 NFIRS incident types — county-level breakdown.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Gas leak (natural gas or LPG) | 614 | 21.7% | |
| 2 | Cooking fire, confined to container | 315 | 11.1% | |
| 3 | Building fires | 247 | 8.7% | |
| 4 | Power line down | 186 | 6.6% | |
| 5 | Brush, or brush and grass mixture fire | 174 | 6.1% |
20 cities sit in Mercer County. Click for the per-city NFIRS profile.
| # | City | Population | 2025 incidents | Building fires | Grade |
|---|---|---|---|---|---|
| 1 | Hamilton | 91,819 | 674 | 29 | A |
| 2 | Trenton | 90,055 | 323 | 22 | B+ |
| 3 | Ewing | 36,140 | 574 | 58 | C+ |
| 4 | Lawrence | 32,636 | 343 | 25 | A |
| 5 | Princeton | 30,450 | 371 | 23 | A- |
| 6 | East Windsor | 29,784 | 120 | 35 | A |
| 7 | West Windsor | 29,445 | 141 | 21 | A |
| 8 | Robbinsville | 15,413 | 128 | 4 | A- |
| 9 | Mercerville | 14,364 | 0 | 0 | A+ |
| 10 | Hamilton Square | 11,894 | 0 | 0 | — |
| 11 | White Horse | 9,692 | 0 | 0 | — |
| 12 | Twin Rivers | 8,144 | 0 | 0 | A+ |
| 13 | Yardville | 6,405 | 0 | 0 | A+ |
| 14 | Hightstown | 5,864 | 52 | 16 | A- |
| 15 | The College of New Jersey | 4,299 | 0 | 0 | — |
| 16 | Lawrenceville | 3,759 | 41 | 0 | A- |
| 17 | Groveville | 3,335 | 0 | 0 | — |
| 18 | Pennington | 2,780 | 77 | 13 | C |
| 19 | Princeton Junction | 2,022 | 13 | 1 | A- |
| 20 | Titusville | 671 | 38 | 4 | C |
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 Mercer 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.