1st MidAmerica Credit Union is a not-for-profit financial cooperative headquartered in Bethalto, Illinois, founded in 1934 as the Western Cartridge Company Employees Credit Union. It serves over 63,000 members across 10 branches in Illinois and Missouri, offering mortgages, auto loans, checking accounts, and investment services. The credit union is the 14th largest in Illinois and operates under an Illinois state charter.

Alltru Credit Union is a member-owned, not-for-profit financial cooperative headquartered in Wentzville, Missouri, serving the St. Louis metropolitan area since 1968 (originally as McDonnell Douglas Credit Union, later 1st Financial Federal Credit Union until rebranding in 2020). The credit union operates multiple branches across St. Louis City, St. Louis County, and St. Charles County, with over 39,600 members and approximately $343.8 million in assets. Alltru is a federally insured institution and designated Community Development Financial Institution (CDFI).

City & County Credit Union is a federally chartered credit union serving the Saint Paul, Minnesota area. The institution provides financial services to members within its defined field of membership. It operates as a member-owned cooperative financial institution regulated by the National Credit Union Administration (NCUA).

Mainstreet FCU is a federal credit union headquartered in Lenexa, Kansas. The institution serves members in the Kansas City metropolitan area and surrounding regions. It operates as a community-based financial cooperative providing traditional banking services to its membership.

Mazuma Credit Union is a federally chartered credit union headquartered in Overland Park, Kansas, serving members across multiple states. It is one of the larger credit unions in the Kansas City metropolitan area with a focus on consumer and small business lending. The institution operates both physical branches and digital banking services.

Members 1st Credit Union is a federally chartered credit union based in Saint Louis, Missouri. The institution serves members in the Saint Louis metropolitan area and surrounding regions. It operates as a community-based financial cooperative providing traditional banking services to its membership.

Mid American Credit Union is a federally chartered credit union serving the Wichita, Kansas area. The institution provides financial services including savings, checking, and lending products to its membership. It operates as a community-based financial cooperative in south-central Kansas.

National Police Federal Credit Union is a credit union serving law enforcement and public safety personnel, based in Chicago, Illinois. The institution serves police officers and related public safety professionals across multiple states.

Neighbors Credit Union is a federally chartered credit union serving the Saint Louis, Missouri area. The institution provides financial services to members within its defined field of membership. Limited public information is available regarding specific assets or membership size.

R-G Federal Credit Union is a federal credit union headquartered in Raymore, Missouri, established in 1957 to serve military and civilian personnel at Richards-Gebaur Air Force Base. It now serves approximately 7,800 members across 12 Missouri counties (Jackson, Cass, Johnson, Bates, Vernon, Henry, St. Clair, Cedar, Hickory, Morgan, Benton, and parts of Pettis) with assets exceeding $119 million. The credit union operates multiple branches and offers loans, checking accounts, and online banking services.