ZIP 20634 (Great Mills, MD) truck route planning & crash data
Plan safer truck routes around ZIP 20634: commercial truck and garbage truck crashes here and in St. Mary's County, dangerous roads, seasonality and route safety data for fleets.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
14 of 367 truck crashes since 2015.
Deadliest roads
How St. Mary's County compares with Maryland
St. Mary's County against Maryland and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where St. Mary's County stands out
Full comparison
| Measure (2015–2025) | St. Mary's County | Maryland | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 27.1 | 49.3 | 49.7 | 45% below the state |
| Deaths per 100 crashes | 2.0 | 2.2 | 3.4 | 9% below the state |
| Injuries per crash | 0.67 | 0.53 | 0.49 | 1.3× the state |
| Garbage-truck share | 4.0% | 3.1% | 2.3% | 1.3× the state |
| On snow, slush or ice | 0.6% | 2.4% | 6.2% | 76% below the state |
| Morning rush (6–10 am) | 31.7% | 24.7% | 23.7% | 1.3× the state |
| In rain, sleet or snow | 9.5% | 13.8% | 13.8% | 31% below the state |
| Winter months (Nov–Mar) | 41.8% | 40.4% | 41.9% | same |
| After dark | 13.3% | 25.2% | 24.8% | 47% below the state |
Compared with Maryland, St. Mary's County is lower on crashes per 100k residents / yr, deaths per 100 crashes and on snow, slush or ice. It stands out for higher injuries per crash, garbage-truck share and morning rush (6–10 am).
What stands out in St. Mary's County: 0.6% of truck crashes happened on snow, slush or ice, vs 2.4% in Maryland.
Overview
Police reported 367 crashes involving commercial trucks in St. Mary's County since 2015: 243 people were injured and 8 were killed.
In complete reporting years that works out to about one truck crash every 12 days.
When crashes happen
The worst month is March with 12.0% of truck crashes; the quietest is February at 6.3%.
The five winter months (November to March) hold 41.8% of truck crashes, against 40.4% across Maryland.
The busiest hour is 12–1 pm, with 11.4% of truck crashes.
Snow, slush or ice was on the road in 0.6% of truck crashes, compared with 2.4% in Maryland.
Where crashes happen
Roads with fatal crashes involving a large truck within 10 miles of ZIP 20634 since 2015: SR-235 (1) and SR-4 (1). No single road stands out.
Garbage & waste trucks
Garbage and refuse trucks were involved in 14 crashes, 3.8% of the total, against 3.1% across Maryland.
Route planning tips for ZIP 20634 fleets
- Review driver schedules for March, the month with the most truck crashes.
- Morning starts matter: 31.7% of truck crashes fall between 6 and 10 am, higher than Maryland.
- Use the free Route Planner to score your route and spot low bridges before drivers head out.
About the data
This report uses the FMCSA crash file (reported crashes of trucks over 10,000 lb) and NHTSA FARS (fatal crashes). It reports the numbers without guessing at reasons.
Truck crashes by year: all trucks vs garbage trucks
Seasonality: when trucks crash in St. Mary's County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| SR-235 | 1 |
| SR-4 | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (St. Mary's County) |
|---|---|
| Three Notch Rd | 101 |
| Point Lookout Rd | 52 |
| Budds Creek Rd | 13 |
| St Andrews Church Rd | 12 |
| Acrs Marked Off Road | 8 |
| Great Mills Rd | 7 |
| Hollywood Rd | 6 |
| Patuxent Beach Rd | 5 |
ZIP 20634 at a glance
| Population | 7,088 |
| Density | 391 per sq mi |
| Median household income | $139,375 |
| Median home value | $343,864 |
| Home ownership | 65% |
Historical data: truck crashes in St. Mary's County since the 1990s
Combines the FMCSA crash file (all reported truck crashes, real coverage from about 1990) with NHTSA FARS (fatal crashes involving a large truck, 1982–2024).
| Decade | Truck crashes / yr | Change | Fatal crashes / yr (FARS) |
|---|---|---|---|
| 1990s | 14 | — | 1.1 |
| 2000s | 10 | -30% | 0.6 |
| 2010s | 24 | +158% | 0.8 |
| 2020s | 34 | +37% | 0.4 |
From the 1990s to the 2020s, yearly reported truck crashes went from 14 to 34. Some of the change may reflect how crashes were reported. NHTSA counts 1.5 fatal large-truck crashes a year in 2016–19 and 0.4 a year in 2020–24.
Nearby ZIP codes
Questions fleets ask about ZIP 20634
How many truck crashes happen in ZIP 20634?
St. Mary's County has had 367 reported truck crashes since 2015, injuring 243 people and killing 8.
When do most truck crashes happen in ZIP 20634?
Truck crashes in St. Mary's County peak in March, with 12.0% of the year's crashes.
Are garbage truck crashes common in ZIP 20634?
Since 2015, St. Mary's County has reported 14 garbage-truck crashes, or 3.8% of its truck crashes.
What is the truck crash rate in ZIP 20634 compared with Maryland?
St. Mary's County records 27.1 truck crashes per 100,000 residents a year, against 49.3 across Maryland.
How do I plan a garbage truck route in ZIP 20634?
Use the free Route Planner: enter your stops to get a risk score, safer alternatives and the low bridges on your route.
2026 is a partial year. Updated October 2026.