The 1978 United Way and United Black Fund campaign, the most successful in the Washington area's history, raised more than $21 million this year, according to final tallies announced yesterday at a victory luncheon.

Joseph Danzansky, general chairman of the campaign and chairman of the board of Giant Food, called the successful campaign a "very exciting tribute to the Washington community." He praised the 65,000 volunteers for their work in the 1978 drive, which raised 10 percent more than last year's effort.

At a luncheon yesterday at the Sheraton-Park Hotel, about 1,000 United Way volunteers celebrated the conclusion of the organization's 50th year of Washington area fund-raising. In 1973, the United Black Fund joined the United Way in their first joint fund-raising effort.

Proceeds benefit 113 United Way agencies and 50 agencies assisted by the United Black Fund throughout the area.

This year all 16 of the volunteer regional chairman reported substantial increases over last year's totals.

Prince William County reported contributions of $60,116, a 25 percent increase. Arlington raised $170,166, a 22 percent increase, and Fairfax-Falls Church contributed $359,980, an 18 percent rise.

Prince George's County raised $313,959, a 17 percent increase. Alexandria, which increased its contributions by 14 percent, raised $275,064. Montgomery County contributed $419,528, an increase of 10 percent. The District contributed $1,195,958, a 6 percent increase.

The two largest contributors to the 1978 campaign were federal employes, who gave more than $9 million, and employes of the area's largest private companies, who gave more than $5 million.