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:

• 1–9: Schodack
• 15–21: Nassau
• 23–33: Stephentown
• 36–42: Berlin
• 43–44: Poestenkill
• 45–53: Sand Lake
• 54–63: East Greenbush
• 65–76: North Greenbush
• 79–88: Grafton
• 90–98: Petersburgh
• 100–105: Hoosick
• 109–115, 117–118 and 123: Pittstown
• 116, 119–122 and 124–127: Schaghticoke
• 128–145: Brunswick

Each route entry below contains a link to its relation in OpenStreetMap (OSM).

• County routes in New York
• List of former state routes in New York (301–400)