List Services


Opportunity Knocks Services offers a variety of lists for your calling campaign and email marketing efforts.  Since 2001 we have been sourcing lists for our customers and their calling and emailing campaigns.  We have a wide variety of solutions and options for all of your list needs. If you need a specialized list- let Opportunity Knocks Services help you find it! Most of our calling campaigns do come with a free standard list, but a standard list is not necessarily always the right choice for optimal results. 

OPK also offers lists that INCLUDE opt in email addresses in most business categories.

Consult with Opportunity Knocks Services today about your list needs! 

It is not necessary to be engaged in a telemarketing program with OPK to purchase one of our call lists.

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