The number of candidates seeking seats in the Virginia House of Delegates continued to grow this week as six Northern Virginians, including one incumbent, announced their candidacies.

In Arlington County, three Republicans said they are joining the already long list of candidates running for a seat in the newly created three-member district. The county had four seats before the recent redistricting. The latest candidates in the new 22nd district are Georgia Delyannis, Ted Lattanzio and Michael Steinmetz.

In other districts, Fairfax County resident Robert Andrews is running for a seat in the new 49th district and Jack Rollison of Woodbridge announced his intention to make a bid for the new three-member 23rd district, which covers Prince William and Loudoun counties.

Incumbent Del. Bernard S. Cohen (D-Alexandria), seeking his second term, is making a bid in the two-seat 21st district. During his freshman tenure, the Alexandria lawyer sponsored tenant and condominium-conversion bills and sat on the Courts of Justice Committee. Cohen said he plans to continue fighting for the preservation of rental property in Northern Virginia and repeal of the sales tax on food.

In Arlington, Lattanzio is making his second bid for elected office. He ran unsuccessfully for a house seat in 1979. An official with the National Rifle Association, Lattanzio supports a revision of the state criminal code. He said he would endorse mandatory prison sentences for anyone convicted of using a weapon in the commission of a violent crime and would tighten up parole eligibility requirements. Lattanzio said although he supports the concept of equal rights he does not support ratification of the Equal Rights Amendment.

Also joining the fray in Arlington, Steinmetz has been active in the Republican Party on the state and national levels. He served as assistant director of political resources for the GOP national committee in 1978 and coordinated activities for the Reagan presidential campaign in New York. Steinmetz plans to campaign on a platform stressing the need for improved transportation in Northern Virginia and a review of state regulatory policies. Reflecting upon the controversy surrounding the recent redistricting, Steinmetz said he would push for a new reapportionment plan that would increase the number of districts and seat only one delegate per district.

The third Republican adding her name this week to the list of candidates in Arlington is Delyannis. The Virginia liaison to the National Federation of Republican Women, Delyannis chose not to comment on any issues. She did say, however, she does not support ratification of the ERA. Inequities in the law, she said, should be addressed at the state, rather than the federal, level.

Andrews, a candidate in the 49th district, is seeking his first elected office. A McLean resident, the former Justice Department lawyer favors a complete review of the state's criminal code. The number of prisons needs to be increased and more counseling should be offered inmates, he said, noting that "too many ex-offenders get out on the streets and they can't read or write, so they end up back in jail. We need to educate and prepare our prisoners."

Previously, Andrews was on the board of the McLean Citizens Association and was a founder of the McLean Planning Committee, a county-affiliated organization charged with designing a master plan for McLean's central business district. Andrews also said he would like to see a commuter road built parallel to the Dulles Airport access road. l

The sixth Northern Virginian and fifth Republican to enter the House primaries last week, Jack Rollison is running for a seat in the new 23rd district. It is the Prince William resident's first try for elected office. dRollinson, chairman of the Prince William County Private Industry Council, said he supports revisions in the state's welfare code to place primary responsibility for welfare needs with the private sector.He supports ratification of the ERA, but does not favor use of state funds to pay for abortions. He said he does not endorse extension of the Voting Rights Act.

Party primaries have been set for Sept. 8; the general election will be Nov. 3.