With so many numbers nationwide... the potential number of sequences is unmeasurable So, if you have been trying to find a certain number that starts with a 703-643 area code exchange, you you now can. Thanks to reverselookupphonedirectory.com, all you have to do to get information on someone with a 703-643 is enter their complete nine digit numberr into the provided search area. That is all you need to start your research. The days of trying to find background information from several sources are gone.