Flood Zone Comparison
Compare key metrics between 21704 21704, MD — Zone AE and 37342 37342, TN — Zone A. Data sourced from FEMA National Flood Hazard Layer (2025).
| Metric | 21704 21704, MD — Zone AE | 37342 37342, TN — Zone A |
|---|---|---|
| name | 21704 21704, MD — Zone AE | 37342 37342, TN — Zone A |
| zip code | 21704 | 37342 |
| city | 21704 | 37342 |
| state | Maryland | Tennessee |
| state code | MD | TN |
| category | High Risk | High Risk |
| flood zone | Zone AE (High Risk — 100-Year Floodplain) | Zone A (High Risk — 100-Year Floodplain, No BFE) |
| 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 | 2,134 | 2,134 |
| base flood elevation | 27 ft | 27 ft |
| historical floods | 8 recorded flood events in the past 50 years. Most recent major flood: 2013 | 5 recorded flood events in the past 50 years. Most recent major flood: 2006 |
| nearest water | Lake Huron (3.7 miles) | Potomac River (3.5 miles) |
| elevation ft | 558 | 1,324 |
| population | 61,698 | 74,395 |
| median home value | 301,396 | 681,871 |
| flood damage risk | 40-60% chance of flood damage over a 30-year mortgage. Estimated average damage per flood event: $156,502 | 40-60% chance of flood damage over a 30-year mortgage. Estimated average damage per flood event: $70,724 |
| 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 | 2350C257J | 9184C971J |
| 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.