Rillito is an unincorporated community in Pima County, Arizona, United States, completely surrounded by the town of Marana. The largest business in the community is Arizona Portland Cement and the community has had a post office since the 1920s. There is a regional park and recreation center (Rillito Vista Community Center) in the middle of the community. Rillito has the ZIP Code of 85654; in 2000, the population of the 85654 ZCTA was 148.
- Dex Official Directory for Tucson Arizona, p. 47, s.v. Pima County Parks and Recreation Dept.