County routes in Rensselaer County, New York, are maintained by the Rensselaer County Highway Department and signed with the Manual on Uniform Traffic Control Devices-standard yellow-on-blue pentagon route marker.

Routes generally do not enter cities or incorporated villages, except for CRs 117 & 118 in Valley Falls.

County route numbers are assigned in clusters by town, with the number indicating the town that most of the route lies within: Each route entry below contains a link to its relation in OpenStreetMap (OSM).