With the highest bond rating in county history, Lamar County Commissionersâ Court sold $4.5 million in certificates of obligation at an interest rate of less than 1% at a Monday meeting. Funds will be used to buy equipment and materials to improve county roads, replace jail doors at the county jail and to make repairs to the roof and air handling system at the courthouse. FHN Financial Capital Markets of Memphis, Tennessee, turned in the low interest bid of 0.947630% among eight other financial institutions. âYou received a AA rating from Moodyâs rating agency, which is the highest rating the county has ever had,â said Mark McLiney, senior managing director of SAMCO Capital Markets. âThe strengths they pointed out included strong financial operations, strong liquidity, meaning you have very good fund balances, and very low debt compared to other counties, and you have low operating costs. The one weakness noted is per capita valuation.â