National celebrities including sports announcer Howard Cosell, author Herman Wouk and Manhattan real estate developer Donald Trump helped make Bullets basketball player and congressional candidate Tom McMillen the top fund-raiser in Maryland for a federal office last year, according to reports filed yesterday.

McMillen, a Democrat, reported raising $199,262 in his bid to win the 4th District congressional seat, composed of Anne Arundel and parts of Howard and Prince George's counties, which is being vacated by Rep. Marjorie Holt (R). His Republican challenger, Maryland House Minority Leader Robert R. Neall, has raised $96,731.

Rep. Barbara Mikulski (D) led her three Democratic opponents for the U.S. Senate in fund raising last year, raising $197,098. But although Mikulski led in fund raising, she starts the year with less cash on hand than two of her Democratic opponents. Her campaign spent substantially more on polling, campaign literature, direct mail and specialized newsletters, and her opponents carried over more money from previous campaigns.

"In spite of all the talk surrounding Mikulski's early lead, we find that Mike is at a very strong position financially," said Bill Bronrott, spokesman for Rep. Michael Barnes, a Democrat who has raised $173,099 and ended the year with $308,137 cash on hand, more than twice as much as Mikulski. Barnes started his fund raising in October, several months after Mikulski began hers.

The two other Democratic candidates for the Senate raised significantly less money. Baltimore County Executive Donald P. Hutchinson had contributions of $31,445, but ended the year with $237,284 cash, because of money remaining from previous campaigns. Gov. Harry Hughes, who has yet to announce his candidacy and has not solicited from any political action committees, raised $49,012 and had $38,293 cash on hand.

No Republicans registered campaign committees for a Senate race last year, although Del. Thomas Mooney has since formally declared his candidacy, and White House aide Linda Chavez and Baltimore business executive Richard Sullivan are expected to enter the race soon.

Candidates estimate it will cost from $2 million to $4 million to make the statewide race.

The Montgomery County congressional contest also has attracted a crowded roster of candidates vying to succeed Barnes. A spokesman for state Sen. Stewart Bainum Jr. said the Montgomery County Democrat's report will show that he raised $52,338 in 1985, more than his five rivals for the party's nomination in the 8th District.

Republican Constance A. Morella, a member of the Maryland House of Delegates from Bethesda, reported raising $45,135, more than three times the amount raised by her only GOP opponent, William S. Shepard of Potomac.

In the Virginia suburbs, Republican Rep. Frank Wolf raised $104,007 for the race for the 10th District, which includes Arlington, Loudoun and northern Fairfax counties. His expected Democratic opponent, Arlington County Board Member John G. Milliken, did not register his campaign committee before the end of 1985 and therefore was not required to file a report.

Rep. Stan Parris, an unsuccessful candidate last year for the Republican nomination for governor, raised $141,117. No Democrat has yet announced for the 8th District, which includes Alexandria and parts of Fairfax, Prince William and Stafford counties.

Kathleen Kennedy Townsend said yesterday that she has registered her campaign committee with the Federal Election Commission, making official her bid for the Democratic nomination to unseat Republican Rep. Helen D. Bentley of Baltimore County. Bentley raised $108,000 last year.

In the Senate race, political action committees made the heaviest contributions to Mikulski. About 35 percent of her money came from PACs, compared with 14.5 percent for Barnes, 2 percent for Hughes and no PAC money for Hutchinson.

Mikulski, a member of the House Commerce Committee, which deals with telecommunications and health issues, received $4,000 from AT&T PAC and $2,000 from the American Optometric Association. She also received several labor contributions and donations from women's groups.

Most of Barnes' contributors were from the Washington metropolitan area, including more than two dozen from developers and others associated with the real estate industry. They included Oliver T. Carr ($950), Charles E. Smith ($1,000); Fairfax developer John T. (Til) Hazel ($1,000), Montgomery County developer Morton Funger and Norma Funger ($2,000).

Most of Hutchinson's contributions were in small amounts of $25, $50 or $100. Hughes' only PAC contribution was a $1,000 donation from First Maryland Bancorp.

McMillen received 31 percent of his money from PACs, compared with 26 percent collected by Neall, his Republican opponent. McMillen got contributions from a wide array of celebrities from across the country, a fact his campaign manager attributed to his travels with the Bullets.

"When he's playing in Cleveland, Detroit, Kansas City, after the game Tom will sit down and have dinner with them. And often they'll write a check," said campaign manager Jerry Grant.

Neall said 90 percent of his funds came from within Maryland. "What is most reassuring to me is that over 70 percent of the total receipts came from within the district from the people I hope to represent in Congress," said Neall.

Bainum, a millionaire businessman from Silver Spring, plans to raise at least $250,000 for his party's primary election in September, according to his supporters.

"Stewart's campaign could go as high as $350,000 or even $400,000 -- it depends a lot on what the other candidates do," said one of Bainum's allies.

Democrat Leon G. Billings, a private lobbyist and former Capitol Hill staff member, raised $46,762 from nearly 400 contributors, according to his campaign.

"I do not have great personal wealth," Billings said in a prepared statement. "Citizen support will be the backbone of my campaign."

Former U.S. representative Carlton R. Sickles, another Democrat, reported raising $15,393. Of that total, $10,000 was contributed by two labor-related political action committees.

Ford Motor Co. lobbyist Wendell M. Holloway reported $11,870 in contributions, $2,000 of which came from four members of the New England Patriots football team, on which his son Brian plays.

The two other Democrats in the race, private consultant Bernard Aronson and County Council member Esther P. Gelman, have not formally declared their candidacies and filed no financial report with the FEC.

Republican Morella received a $5,000 contribution from a Chicago-based Realtors PAC and $1,000 contributions from 15 individuals, some of them prominent Washington area businessmen.

Dominic F. Antonelli Jr., president of the giant PMI parking lot company, gave $1,000 to Morella and $1,000 to Shepard, her rival.

Shepard, a retired Foreign Service officer, reported raising $13,590 in 1985.