There are dozens of addresses that are illogical. These addresses are illogical because they do not follow the normal rules of Washington, DC's addressing grid system. These illogical addresses are also referred to as address anomalies. DC GIS maintains an address anomalies list which can be viewed and downloaded on the following webpage:
There are dozens of address anomalies in Washington, DC. DC GIS has spent hundreds of hours tracking down these cases and ensuring that the database matches the reality on the street.
Please check out our Address Anomalies Report (very large pdf).