Yes. The facility must be located, and the work performed, in an area designated for the declaration. Sheltering, evacuation and emergency operations center activities are the exception: they may take place outside the area as long as they serve the designated area. Work on a facility outside the area is ineligible, even if it protects a facility inside it.
For small and large projects: the facility location (address or GPS coordinates), or a certification that the facility and the work are within the designated area.
Check which categories of work each county is designated for before you claim. An area can be designated for emergency work but not for permanent work.