On May 7, 1907 the county granted a 20-year franchise to the Wagner, Lake Shore and Armour Traction Company under Chapter 107 (1903) to use specified highways for an electric railway, and the board also approved short-term ferry leases across the Missouri River to local lessees.

After an extended canvass of competing petitions, the Charles Mix County Board of Commissioners found the Geddes petition contained a majority of valid signatures and ordered the county-seat question (Wheeler→Geddes) placed on the next general-election ballot; the Lake Andes petition was found short of a majority.

In meetings across 1941 the Charles Mix County Board of Commissioners approved sales of county‑owned parcels, adopted a supplemental 1941 budget, formalized a food‑stamp plan and passed resolutions enabling the issuance of bonds to fund outstanding warrants and permanent‑school indebtedness.

The board approved awarding the Federal Aid Secondary asphalt contract (project S-2000(10)) to Reynolds Construction Co. of Sioux Falls; the bid was about 14.5% below the engineer's estimate and the county authorized execution with state contracting processes.

In March 1971 the county board passed a resolution opposing the Board of Regents' decision to move the State University engineering department to the School of Mines at Rapid City, urging Regents to reverse their decision and asking the state legislature to override it if necessary.

The Board of Commissioners approved low bids this spring and summer for multiple Federal-Aid road projects, awarding an asphalt contract to Reynolds Construction Co. and later approving seal-coat and radio-maintenance contracts that support the county's pavement program.

Commissioners adopted a resolution authorizing a Memorandum of Agreement with Progressive Energies, LLC, signaling county willingness to act as conduit for up to $20 million in revenue bonds to finance an ethanol plant project; the agreement requires later bond terms, matching approvals and a lease or purchase agreement with the company.