Google Maps JavaScript API Example: Advanced Directions
From:    To: 
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Formatted DirectionsMap
By entering any address in the From and To, you can get complete directions coming from or going to any locations in the United States.  
Ex: San Marcos, Ca or 128 N. Las Posas Rd, San Marcos, Ca. to New York, NY
Enter street number & name and city & state or just city & state.
Select Number links to get additional directions.
TILTON REALTY
128 N. Las Posas Rd.
San Marcos, Ca. 92069