Flood Zone Comparison
Compare key metrics between 03580 03580, NH — Zone AE and 21639 21639, MD — Zone AE. Data sourced from FEMA National Flood Hazard Layer (2025).
| Metric | 03580 03580, NH — Zone AE | 21639 21639, MD — Zone AE |
|---|---|---|
| name | 03580 03580, NH — Zone AE | 21639 21639, MD — Zone AE |
| zip code | 03580 | 21639 |
| city | 03580 | 21639 |
| state | New Hampshire | Maryland |
| state code | NH | MD |
| category | High Risk | High Risk |
| flood zone | Zone AE (High Risk — 100-Year Floodplain) | Zone AE (High Risk — 100-Year Floodplain) |
| risk level | High Risk | High Risk |
| annual flood prob | 1% annual chance (100-year flood) | 1% annual chance (100-year flood) |
| insurance required | Required for federally-backed mortgages | Required for federally-backed mortgages |
| avg annual premium | 954 | 954 |
| base flood elevation | 13 ft | 9 ft |
| historical floods | 3 recorded flood events in the past 50 years. Most recent major flood: 2010 | 8 recorded flood events in the past 50 years. Most recent major flood: 2021 |
| nearest water | Colorado River (0.2 miles) | Colorado River (1.9 miles) |
| elevation ft | 936 | 1,273 |
| population | 19,537 | 33,467 |
| median home value | 631,784 | 550,190 |
| flood damage risk | 40-60% chance of flood damage over a 30-year mortgage. Estimated average damage per flood event: $99,750 | 40-60% chance of flood damage over a 30-year mortgage. Estimated average damage per flood event: $112,414 |
| mitigation tips | Elevate utilities above base flood elevation; install sump pumps with battery backup; consider flood-proofing ground floor; maintain flood insurance; create an emergency evacuation plan; store important documents above flood level. | Elevate utilities above base flood elevation; install sump pumps with battery backup; consider flood-proofing ground floor; maintain flood insurance; create an emergency evacuation plan; store important documents above flood level. |
| fema map id | 7238C268J | 5110C511J |
| last updated | 2025-01-01 | 2025-01-01 |
Our team analyzes data from FEMA National Flood Hazard Layer to deliver accurate, up-to-date information. All data is verified and cross-referenced with official sources.