- Radum
- Ranch House Estates
- Red Corral
- Ramada
- Rancho Llano Seco
- Riceton
- Richardson Springs
- Robinson Mills
- Robinsons Corner
- Roble
- Rogerville
- Ryan Island
- Red Apple
- Rich Gulch
- Rocky Hill
- Rockland
- Round Rock
- Ranchita
- Rancho Rinconada
- Ravendale
- Raymond
- Red Mountain
- Redcrest
- Redwood Estates
- Redwood Terrace
- Redwood Valley
- Represa
- Requa
- Rescue
- Reseda