Becoming an Owner

At Quantum, we are eager for you to become part of our growing family. We’ve been around for over 75 years and we’ve been serving the community-at-large for 20 of them.

Member Eligibility

Anyone who lives or works in the following counties is eligible for membership with Quantum:


  • Sedgwick
  • Coffey
  • Harvey
  • Reno
  • Anderson
  • Cowley
  • Kingman
  • Sumner
  • Allen
  • Franklin
  • Lyon
  • Woodson
  • Butler
  • Greenwood
  • Osage


We Are Not a Bank

Many people outside of credit unions (and probably a lot of credit union members), don’t know how we’re different from a bank, and that’s okay. We do a lot of the same things, but there are some key things that help set us apart from - and above - our banking brethren.

We are a not-for-profit cooperative, which means more for you. We do not issue stock or pay dividends to outside stockholders. Here, earnings are returned back to our members in the form of lower rates, higher interest on deposits, and lower fees.