- Ramsey (Population: 1,056)
- Rantoul (Population: 12,857)
- Red Bud (Population: 3,422)
- Richmond (Population: 1,091)
- Richton Park (Population: 12,533)
- River Forest (Population: 11,635)
- River Grove (Population: 10,668)
- Riverdale (Population: 15,055)
- Riverside (Population: 8,895)
- Riverton (Population: 3,048)
- Riverwoods (Population: 3,843)
- Roanoke (Population: 1,994)
- Robbins (Population: 6,635)
- Robinson (Population: 6,822)
- Rochelle (Population: 9,424)
- Rochester (Population: 2,893)
- Rock Falls (Population: 9,580)
- Rock Island (Population: 39,684)
- Rockdale (Population: 1,888)
- Rockford (Population: 150,115)
- Rockton (Population: 5,296)
- Rolling Meadows (Population: 24,604)
- Rome (Population: 1,776)
- Romeoville (Population: 21,153)
- Roodhouse (Population: 2,214)
- Roscoe (Population: 6,244)
- Roselle (Population: 23,115)
- Rosemont (Population: 4,224)
- Roseville (Population: 1,083)
- Rosewood Heights (Population: 4,262)
- Rosiclare (Population: 1,213)
- Rossville (Population: 1,217)
- Round Lake Beach (Population: 25,859)
- Round Lake Heights (Population: 1,347)
- Round Lake (Population: 5,842)
- Round Lake Park (Population: 6,038)
- Roxana (Population: 1,547)
- Royalton (Population: 1,130)
- Rushville (Population: 3,212)
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