BDM International Inc. and its subsidiaries registered record revenue and earnings for 1980, the company's president said yesterday.

Revenue for 1980 totaled $83 million, rising 28 percent from $65 million in 1979, BDM president Earle C. Williams said. Net income increased 34 percent to $2.758 million ($1.50 a share) from $2.059 million ($1.23) in 1979.

BDM is a professional services firm based in McLean that provides consulting and other services to clients including the federal government.

Last week the company announced a 15-cents-a-share cash dividend payable on April 1 to shareholders of record March 23. Last year's dividend was 12 cents.

Baltimore Gas and Electric Co. reported earnings of $14.097 million ($0.43) for the month ended Jan. 31 compared with earnings last year in January of $4.861 million ($0.15). The substantial improvement was largely attributable to colder winter weather which increased sales of electricity and gas.

Earnings for common stock for the 12 months ended Jan. 31 were $126.536 million ($3.91) compared with $102.846 million ($3.27) for the same period a year ago.

Smithfield Foods Inc. announced earnings for the 14 weeks ended Feb. 1 of $1.157 million ($0.59) compared with net income for the 13 weeks ended Dec. 30, 1979, of $1.795 ($0.76). The company changed its fiscal year from the 52- or 53-week period that ends on the Sunday nearest to Dec. 31 to the 52- or 53-week period that ends on the Sunday nearest to April 30.

In the 40 weeks ended Feb. 1, net income was $1.280 million ($0.65) compared with net income in the 39 weeks ended Dec. 30, 1979, of $3.195 million ($1.35).