Unless otherwise posted, the speed limit in residential areas is:

If you are driving in a residential area and don’t see a speed limit posted, you should not drive above 25 mph. This is because residential areas are considered low-speed zones where you are more likely to encounter pedestrians, bicyclists, parked vehicles pulling out, children playing near the street, or cars entering and exiting driveways.
Driving at or below 25 mph gives you more time to see and react to these potential hazards. Even a small reduction in speed can significantly reduce the severity of a crash or help you avoid it altogether.

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