The FEMA Flood Map Service Center (MSC) is the official public source for flood hazard information produced in support of the National Flood Insurance Program (NFIP). Use the MSC to find your official flood map, access a range of other flood hazard products, and take advantage of tools for better understanding flood risk.
Here is a link to a guide on How to Make a FIRMette, a custom flood map extract from the FEMA Map Center, for your reference