A toll-free number is available for people needing assistance from the Federal Emergency Management Services. It is 1-800-462-9029.
James Lee Witt, FEMA director, toured storm wreckage in south Oklahoma City on Tuesday with Gov. Frank Keating.
At a news conference afterward, Witt said offices will be set up to take applications for assistance, but there is no need for victims to wait.
Officials said more than 100 people are available to take applications at the agency's regional office in Dallas through the toll-free number.
President Clinton declared 11 Oklahoma counties disaster areas Caddo, Cleveland, Creek, Grady, McClain, Oklahoma, Kingfisher, Lincoln, Logan, Pottawatomie and Tulsa.
Witt said those left homeless by the storm could qualify for grants of up to 18 months for temporary housing and other assistance through low-interest loans.
Public assistance also is available to the state for debris clearance and emergency protective measures and rebuilding under a 75-25 federal-state match.
Gov. Frank Keating and Attorney General Drew Edmondson asked Oklahoma businesses to be "good neighbors during the period of rebuilding and keep prices for materials the same as they were before the storm.
"No gouging, Keating urged.
Edmondson said he would urge the Legislature to pass a law to prevent the price gouging. He said he would ask cities to pass similar ordinances.
The attorney general also cautioned people wanting to donate food or supplies to contact legitimate organizations such as the Red Cross, Salvation Army and Feed the Children and avoid scam artists who often take advantage of disasters.
Sandy Garrett, state school superintendent, said officials are assessing the damage to state schools.
She said the state School Board will meet soon to "consider alternate ways of ending the school year in severely damaged schools and to work with affected school districts in determining how best to end the school year.