D.C. mayoral candidate John Ray has extended his already sizable lead in fund-raising -- closing in on the $1 million mark in campaign contributions -- while rival Charlene Drew Jarvis also reported a major boost in contributions, according to the latest campaign finance reports.

Ray, an at-large D.C. Council member, reported raising $215,634 in contributions during the six weeks ending July 31, for a total of $896,213 in overall contributions. His total is nearly three times the amount raised by his closest fund-raising competitors.

Of prime importance, Ray reported $337,982 in cash on hand, suggesting that he has marshalled ample funds to wage an aggressive television and radio campaign in the final four full weeks of the primary campaign.

Jarvis, a Ward 4 council member, also picked up her fund-raising pace, collecting $146,118 in contributions over two months and boosting her total to $318,209.

Jarvis, who appears to have been aided by several prominent fund-raisers who recently joined her campaign, reported cash on hand of $63,283. She also reported campaign debts of $7,200.

Del. Walter E. Fauntroy (D-D.C), who entered the mayor's race much later than his opponents, reported raising $92,424, for a total of $274,852 and cash on hand of $92,796.

Democratic mayoral candidate David A. Clarke raised $65,385 for a total of $370,301 in contributions, including funds raised by his political action committee before he formally entered the race last year.

Clarke, the council chairman who traditionally has run low-budget, volunteer-oriented campaigns, reported $111,013 in cash on hand -- second only to Ray.

Democrat Sharon Pratt Dixon, who had previously raised about $180,000, cited difficulties with her campaign computer system that made it impossible to file most of her contributions. She reported $2,440 in new contributions; cash on hand of $19,943; and debts of $22,373.

Former police chief Maurice T. Turner Jr., the only Republican candidate, reported raising $62,228, for total contributions of $267,912. However, Turner has already spent most of that money, on consultant fees and other campaign costs, leaving him with only $3,071 in cash on hand.

Turner reported campaign debts totaling $52,172.

Collectively, the new batch of campaign finance reports, which were filed on Friday, suggest that the 1990 mayor's race is turning into the most expensive in the city's history. In 1986, Mayor Marion Barry raised about $1.3 million for his reelection, and his Republican rival, Carol Schwartz, raised a little more than $230,000.

With the Sept. 11 primary fast approaching, nearly $2.5 million in overall money has already been contributed to the mayoral campaigns.

Ray, who has raised large amounts of money from the real estate community, continued to do well within that group, collecting $10,000 from firms controlled by downtown developer Ulysses "Blackie" Auger and $4,000 from firms associated with developers James and Ted Pedas. He also received a $250 contribution from the Oliver Carr Co., the first time the development firm has given money in the mayor's race this year.

Ray also did well among other groups and professions, including lawyers and financial service firms, while collecting dozens of smaller contributions as well. He received $250 contributions from lawyer David W. Wilmot, banker William B. Fitgerald Jr. and lawyer Arthur M. Reynolds, who are businessmen and longtime associates of Barry's.

Jarvis also demonstrated broad-based appeal, raising money from gay rights activists, doctors and health care officials, real estate partnerships and restaurants. She received $2,000 from the Tobacco Industry, the main lobbying group for cigarette companies, $4,000 from trial lawyer Joseph Koonz and his law firm, and $500 from zoning lawyer Phil Feola.

Fauntroy received $1,000 contributions from the political action committees of House Speaker Thomas S. Foley (D-Wash.) and Rep. Mervyn Dymally (D-Calif.). While he has sharply criticized Ray's contributions from developers, he accepted $1,000 from the D.C. Builders PAC, $500 from prominent zoning lawyer Whayne Quin, and similar amounts from other real estate interests.