HSA Inquiry If you have any questions regarding our products and services, you can contact us at (574) 235-2000 locally or (800) 513-2360 toll free. You may also contact us by typing your questions or comments in the box below. Be sure to include your email address so we can respond to your message. A 1st Source customer service representative will contact you within one business day. When possible, please provide all applicable information. If information is not applicable, please enter "0" or "none".