One of those in the crowd is Alex Hogue. He says speaking to God changed a friend's life. "He grew up in a troubled home, was considered schizophrenic and was doing all sorts of terrible things," said Hogue.
But Hogue thinks communicating with God turned his friend's life around. "He has been analyzed and he has gone through the whole procedure. And now he is a normal kid," said Hogue.
Organizer Patrick Briney says prayer saved his life. "I personally experienced prayer in my own life by having gone through cancer and chemotherapy 2 times. And the Lord spared my life," said Hogue.
And Briney hopes others will get that message. "Prayer is the most powerful discipline in the Christian life," said Briney. "You may go through trials and afflictions. But sometimes that is what's good. This is what builds character and God will hear you and answer your prayers be with you," said Hogue.
The National Day of Prayer started in 1952 after President Harry S. Truman signed it into law.