County roads in Minnesota are marked with a general white square shield with black lettering and route number.

[1] The M1-6 blue pentagon shield's route number may be shown in either white or gold, depending on the county.

In many counties, CSAH are given low route designation numbers and non-CSAH are given higher route designation numbers, but this is not a rule, for example, Hennepin County Road 26 is a non-CSAH, but other county roads in this series are CSAH.

A few roads that cross county borders are also signed with an "inter-county" designation and a letter, but this system is not shown on most maps.

[2] However, as these highways provide important alternate routes to the state highway system, the Minnesota Department of Transportation have recommended a local route numbering / labeling system that clearly identifies county routes that are continuous into neighboring counties.