Security Service Federal Credit Union Share: Credit UnionsBanks Security Service Federal Credit Union Visit Website 1260 S. Hover Rd., Ste. A Longmont, CO 80501 303-727-6493 303-776-8517 (fax) www.ssfcu.org About Map About Security Service FCU is the 8th largest in the U.S offering full financial services. What's Nearby? Distance: 5 10 15 20 25 50 mi.