Eight firms based in metropolitan Washington and more than a dozen other companies throughout the Middle Atlantic region were among the largest black-owned businesses in the United States last year, according to an annual survey by Black Enterprise magazine.

Nearly all of the region's black-owned enterprises increased their rankings in separate surveys of banks, savings and loan institutions, insurance firms and other businesses.

Overall, Black Enterprise reported, aggregate revenues for the 100 largest non-financial firms rose 15.6 percent in 1977 to $896 million. Motown Industries , a Los Angeles recording and entertainment firm, retained its top ranking for the sixth consecutive year, with revenues of more than $61 million.

Area firms on the non-financial list were headed by Seidel Chevrolet, with revenues of $11 million. Founded in 1974, the auto dealership is based in suburban Landover and employs 61 persons. The chief executive of the company is John Seidel.

Black Enterprise Publisher Earl Graves noted that auto dealerships account for the largest single sector among the top 100 non-financial black companies, with 44, compared to 37 in 1976, and total revenues of $298 million.

Other area companies cited by the magazine are:

Capitol City Liquors of Washington, ranked 21st with revenues of $10 million and 59 employes.

Jones & Artis Construction Co., of Washington, ranked 34th (up from 46th) with revenues of $7.6 million and 250 employes.

Syphax Enterprises, an Arlington construction firm, ranked 74th with revenues of $4.7 million and 60 employes.

Industrial Bank of Washington, fourth-largest black-owned bank with assets of $53 million and 73 employes.

United National Bank of Washington, ninth-largest bank, with assets of $34 million and 65 employes.

Independence Federal Savings & Loan Association, of Washington, fifth-larges S&L, with assets of $44 million and 25 employes.

Community Federal Savings & Loan Association, of Washington, 12th-largest S&L, with assets of $17 million and 14 employes.

Other companies in Maryland and Virginia that were listed by Black Enterprise include Statum Chevrolet, of Salem, Va. ($5.5 million revenues) and the Afro-American Co., of Baltimore, a newspaper publisher ($4 million).

Financial and insurance companies cited included Atlantic National Bank, Norfolk; First State Bank, Danville; Advance Federal S&L, Baltimore; Berkley Citizens Mutual S&L, Norfolk; Union Mutual S&L, Richmond; Ideal S&L, Baltimore; Community S&L, Newport News; Southern Life, Richmond; Virginia Mutual Benefit Life, Richmond; Mutual Benefit Society, Baltimore; and Southern Life, Baltimore.

In addition to Motown, other companies among the five largest non-financial black businesses are Johnson Publishing Co., of Chicago; Feeco Foods Corp., New York; Johnson Products, Chicago; and Afro International, New York.

The magazine's top 100 business enterprises are located in 22 states and D.C. States with the highest concentration are New York (15) ,Illinois (13) and California (11).

A major area firm on last year's list, the H.G. Parks Sausage Co., of Baltimore, was sold and no longer is black-owned.