Credit Company Finder Londonderry Credit Company Listings page. This section lists as many credit and finance companies we could find in Londonderry. If you know a credit and finance company in Londonderry that we’ve missed or own credit and finance company not listed here, please submit a listing on our Listings Page. We list different types of Londonderry credit and finance companies that provide secured & unsecured loans, credit cards and refinancing for individuals and businesses with good or bad credit.