John Nevin Waugaman Jr., 64, board chairman of the DPC Corp., a Maryland computer company, and an area resident since 1967, died of cancer Friday at his home in Potomac.

After moving here from Baltimore he became a co-founder and president of the old Data Prep Corp., a data entry service-operation, and later became board chairman of DPC, a post he held until his death.

Mr. Waugaman was a native of Scottdale, Pa., and lived in Baltimore where he was affiliated with radio station WITH, and was a regional manager of a subsidiary of the Motorola Corp. In the early 1950s, he founded his own answering service company in Baltimore.

He served with the Army Air Forces in the Pacific during World War II.

In addition to his home in Potomac, he maintained a residence in Fort Lauderdale, Fla.

Survivors include his wife, the former Anne Gibbons, of Potomac and Fort Lauderdale; three sons, John N. III, of Kensington, Robert G., of Owings, Md.; four daughters, Ellen Anne Zahniser of Solomons, Md., Rhea Anne Meneely of Annapolis, Patricia Anne Ray of Ocean Pines, Md., and Gertrude Anne Waugaman of Potomac; a brother, Charles H., of Stuart, Fla., and eight grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Montgomery County Visiting Nurses Association, or the American Cancer Society.