Contact the San Marcos Office of Nelson Y. Howard, D.D.S. Address & Phone Number: 1903 W. San Marcos Boulevard Suite 110 San Marcos, CA 92078 Call us at: (760) 599-6559 Email: frontoffice@nyhowarddds.com San Marcos Office Office Hours Monday 8:00 am - 5:00 pm Tuesday 8:00 am - 5:00 pm Wednesday 8:00 am - 5:00 pm Thursday 8:00 am - 5:00 pm Friday 8:00 am - 3:00 pm Customized appointments scheduled by request to meet your needs Request an Appointment Make a Payment Online