Approved Surety Bond Program  The US Department of Treasury approves all surety bonding companies certified to operate within the United States.  Approved firms are listed in Department Circular 570, the Treasury Department’s list of all approved sureties. MuniOs When a government body (city, state, county, special taxing body, etc.) issues a bond, it has to make public an “official statement”—essentially, the prospectus for the bond it is marketing. These can provide valuable information about top employers in a town, tax incentives, and a wealth of other financial information.