Barrios de Missouri O

• O'Fallon Park (2)
• O'Fallon St Charles (46)
• Oak Park Northwest (4)
• Oak Park Southeast (5)
• Oak Park Southwest (4)
• Oakville (7)
• Oakwood (1)
• Old Shoe Factory District (2)
• Old Town South (1)
• Old Westport (5)
• Oldham Farms (3)
• Ott-Chrisman (4)
• Outer North Springfield (30)
• Outer Southeast Springfield (41)
• Outer Southwest Springfield (81)