NCUF says more than $208,000 distributed so far to 248 credit union members hit by September deluge.
An estimated 10,000 credit union employees, members and volunteers need assistance, NCUF said.
New Jersey, New York leagues say financial assistance need is great, thank the industry for its support.
Disaster relief effort follows similar calls for help after flooding, tornadoes earlier this year.
The National Credit Union Foundation has activated the CUAid.coop online system.