Activities of the Finance Department include planning, administration, and supervision of the financial operations of the City. The City Secretary, Christi Shivers, as the chief financial officer of the City, holds these responsibilities. Also funded in this department are the Deputy City Secretary/Accounts Payable Clerk, and the Payroll Clerk.

Specific financial operations include payroll, general ledger maintenance, financial reports, data processing services, revenue collection, investments, and debt management.

The City Secretary/Finance Officer is appointed by the City Council. This sets up a clear division of responsibilities related to municipal finances in the City of Mexia, providing a superior set of checks and balances for the expenditure of public funds.