1,469
Recorded events
24
Counties affected
2
Direct deaths
$80.3M
Property damage
Maryland flood history: 1,469 recorded events across 24 counties between 1996 and 2025.
Decade by decade
Maryland flood history by decade
The 2010s are the busiest decade on record with 793 reported flood events across Maryland. Earlier decades are thinner because systematic reporting for this hazard expanded over time, not because the weather was calmer.
County ranking
Counties with the most flood events in Maryland
| Rank | County | Events | Deaths | Damage | Span |
|---|---|---|---|---|---|
| #1 | Frederick County | 194 | 0 | $50K | 2007–2025 |
| #2 | Montgomery County | 186 | 0 | $50K | 2006–2025 |
| #3 | Baltimore County | 162 | 0 | $35K | 2006–2025 |
| #4 | Prince George's County | 99 | 0 | $25K | 2006–2024 |
| #5 | Anne Arundel County | 87 | 1 | $121K | 2006–2025 |
| #6 | St. Mary's County | 85 | 0 | $30K | 2006–2023 |
| #7 | Harford County | 79 | 0 | $0 | 2006–2024 |
| #8 | Carroll County | 73 | 0 | $5K | 2006–2024 |
| #9 | Howard County | 71 | 1 | $10K | 2006–2024 |
| #10 | Washington County | 60 | 0 | $20K | 2008–2025 |
| #11 | Allegany County | 48 | 0 | $206K | 2006–2025 |
| #12 | Charles County | 43 | 0 | $0 | 2006–2024 |
| #13 | Cecil County | 36 | 0 | $860K | 2006–2025 |
| #14 | Garrett County | 36 | 0 | $203K | 2007–2021 |
| #15 | Calvert County | 27 | 0 | $5K | 2008–2023 |
| #16 | Worcester County | 14 | 0 | $500K | 1996–2020 |
| #17 | Queen Anne's County | 10 | 0 | $1.3M | 2011–2018 |
| #18 | Wicomico County | 9 | 0 | $20K | 1996–2018 |
| #19 | Baltimore city | 9 | 0 | $13K | 1998–2021 |
| #20 | Caroline County | 8 | 0 | $1.1M | 2006–2018 |
| #21 | Somerset County | 7 | 0 | $500K | 2011–2021 |
| #22 | Dorchester County | 7 | 0 | $0 | 1996–2020 |
| #23 | Talbot County | 3 | 0 | $2.0M | 2011–2017 |
| #24 | Kent County | 3 | 0 | $1.2M | 2011–2016 |
Significant events
Deadliest flood events in Maryland
| Date | County | Scale | Deaths | Injuries |
|---|---|---|---|---|
| Sep 8, 2011 | Anne Arundel County | — | 1 | 0 |
| May 19, 2015 | Howard County | — | 1 | 0 |