There are
1,746 mi
from Harlingen, TX to Takoma Park, MD
That's the driving distance. It would take 1 day 8 hours to go from Harlingen, Texas to Takoma Park, Maryland.
The flight distance (direct flight from Harlingen, TX to Takoma Park, MD) is 1,487.69 mi.
1,746 mi = 2,809.22 kms