As per our MLS, zone D: Unstudied areas where flood hazards are undetermined but flooding is possible. No mandatory flood insurance purchase requirements apply, but coverage is available in participating communities.
You can also go to this link at FEMA for additional information: http://msc.fema.gov/webapp/wcs/stores/servlet/HelpView?store
If the house is listed on the MLS, jsut ask your agent. It should be available to them from the information provided. If it isn't on the MLS, you should go into the town hall and speak to someone there who can provide you with the information, Make sure what ever information you get, you get in writing, not just someone telling you verbally .