| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (319) 310-40** | (319) 310-4000 - (319) 310-4099 | 31 |
| (319) 310-41** | (319) 310-4100 - (319) 310-4195 | 41 |
| (319) 310-42** | (319) 310-4200 - (319) 310-4299 | 42 |
| (319) 310-43** | (319) 310-4304 - (319) 310-4394 | 26 |
| (319) 310-44** | (319) 310-4401 - (319) 310-4498 | 34 |
| (319) 310-45** | (319) 310-4500 - (319) 310-4599 | 29 |
| (319) 310-46** | (319) 310-4602 - (319) 310-4698 | 30 |
| (319) 310-47** | (319) 310-4700 - (319) 310-4799 | 38 |
| (319) 310-48** | (319) 310-4802 - (319) 310-4898 | 38 |
| (319) 310-49** | (319) 310-4900 - (319) 310-4999 | 32 |
US Phone Directory: (319) 310-4***
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