Since its inception in 1935 the Summit Credit Union has been serving its members in the Madison, Wisconsin area with exceptional financial products. You can find their current interest rates on used car loans, new car loans, 1st mortgage loans and interest rates on both fixed and adjustable mortgages here on these pages. Currently led by Kim Sponem, the Summit CU has grown its membership to over 167,060 with assets of more than $2,825,723,031. They have a main office and 33 branch offices.