Suggest an Edit Name* Categories* Doctor Hospital Pharmacy Add category State* Locality* ZIP* Street address* Phone* Website Opening hours Monday: 09:00 am — 05:00 pm Tuesday: 09:00 am — 05:00 pm Wednesday: 09:00 am — 05:00 pm Thursday: 09:00 am — 05:00 pm Friday: 09:00 am — 05:00 pm Saturday: 09:00 am — 03:00 pm Company description Dr. David William Haas located in the city of Mason City, state Iowa. The legal address of the Doctor 1403 S Federal Ave. Directions to the Doctor Dr. David William Haas can be found on our interactive map. Ask your questions by calling 6414246531 on workdays.</br></br></br>NPI number: Data not provided</br>Provider's gender: Data not provided</br>Practice names: Data not provided</br>Board certifications: Data not provided Your comments (not for publishing) * — Required information Dr. David William Haas - Mason City ← View details 1403 S Federal Ave, Iowa, Mason City, 50401, Mason City, Iowa 50401 6414246531