ZIP 20659 (Mechanicsville, MD) truck route planning & crash data
Plan safer truck routes around ZIP 20659: 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).
ZIP 20659 at a glance: SR-234 3 fatal truck crashes since 2015, more than any other road within 10 miles of ZIP 20659.
Overview
St. Mary's County has recorded 367 truck crashes since 2015, with 243 people injured and 8 killed.
In complete reporting years that works out to about one truck crash every 12 days.
When crashes happen
March has the most truck crashes, 12.0% of the yearly total, while February has the fewest (6.3%).
Winter months (Nov–Mar) carry 41.8% of truck crashes, vs 40.4% for Maryland.
More truck crashes happen at 12–1 pm than at any other hour (11.4%).
Road surface: 0.6% of truck crashes were on snow, slush or ice (Maryland: 2.4%).
Where crashes happen
The deadliest road for trucks within 10 miles of ZIP 20659 is SR-234, with 3 fatal large-truck crashes since 2015. It is followed by CR-2 (1), SR-231 (1) and SR-235 (1).
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 20659 fleets
- Review driver schedules for March, the month with the most truck crashes.
- Check whether your routes use SR-234, the road with the most fatal truck crashes in this area.
- The morning rush (6–10 am) holds 31.7% of truck crashes here, more than Maryland; adjust start times where you can.
- Check your own stops for crash hotspots and low bridges with the free Route Planner.
About the data
Crash counts come from the FMCSA crash file (police-reported crashes involving trucks over 10,000 lb); fatal-crash locations come from NHTSA FARS. Text on this page states only what these numbers show.
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-234 | 3 |
| CR-2 | 1 |
| SR-231 | 1 |
| SR-235 | 1 |
| SR-247 | 1 |
| SR-6 | 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 20659 at a glance
| Population | 24,324 |
| Density | 97 per sq mi |
| Median household income | $121,654 |
| Median home value | $416,039 |
| Home ownership | 89% |
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 |
Reported truck crashes averaged 14 a year in the 1990s and 34 a year in the 2020s. Reporting practices changed over time, so part of any change can come from reporting. Fatal crashes involving a large truck averaged 1.5 a year in 2016–19 and 0.4 a year in 2020–24.
Nearby ZIP codes
Questions fleets ask about ZIP 20659
How many truck accidents are there in ZIP 20659?
Since 2015, 367 crashes involving commercial trucks were reported in St. Mary's County (243 injured, 8 killed).
Which road has the most fatal truck crashes in ZIP 20659?
SR-234 had 3 fatal crashes involving a large truck within 10 miles of ZIP 20659 since 2015, more than any other road.
What is the worst month for truck crashes in ZIP 20659?
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 20659?
Garbage trucks were involved in 14 reported crashes in St. Mary's County since 2015 (3.8% of truck crashes).
How does ZIP 20659 compare with Maryland for truck crashes?
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 20659?
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.