Junction List
| County | Location | Mile |
km | Exit | Destinations | Notes |
|---|---|---|---|---|---|---|
| Washington |
Sandy Hook | 0.00 | 0.00 | US 340 south (Jefferson Pike) – Harpers Ferry, Charles Town | Southern terminus; Virginia state line at Potomac River | |
| 0.74 | 1.19 | Valley Road north / Keep Tryst Road east | At-grade intersection | |||
| Weverton | 1.56 | 2.51 | MD 67 north (Rohrersville Road) – Boonsboro | Trumpet interchange | ||
| 1.82 | 2.93 | Keep Tryst Road west | Right-in/right-out intersection with eastbound US 340 | |||
| Frederick |
Knoxville | 2.53 | 4.07 | MD 180 east (Jefferson Pike) to MD 478 – Knoxville, Brunswick | Eastbound exit, westbound entrance | |
| Rosemont | 4.39 | 7.07 | 2 | MD 17 (Burkittsville Road) – Brunswick, Burkittsville | ||
| Petersville | 7.77 | 12.50 | 4 | MD 180 (Jefferson Pike) – Petersville | ||
| Jefferson | 10.57 | 17.01 | 8 | Lander Road – Jefferson | ||
| 12.30 | 19.79 | US 15 south (Catoctin Mountain Highway) – Leesburg | West end of concurrency with US 15; westbound exit, eastbound entrance | |||
| 13.92 | 22.40 | Mt. Zion Road | ||||
| Frederick | 16.38 | 26.36 | 10 | I-70 east (Eisenhower Memorial Highway) to I-270 south – Baltimore, Washington | I-70 Exit 52; no exit westbound | |
| 16.62 | 26.75 | 11 | MD 180 (Jefferson Pike) to MD 351 (Ballenger Creek Pike) | |||
| 17.01 | 27.37 | 12 | I-70 west (Eisenhower Memorial Highway) / US 15 north / US 40 west (Frederick Freeway) / Jefferson Street east – Hagerstown, Gettysburg | Northern terminus of US 340; partial cloverleaf interchange; split into exits 12A (I-70) and 12B (US 15 / US 40) eastbound | ||
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | ||||||
Read more about this topic: U.S. Route 340 In Maryland
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