If you got a parking ticket in New York City and ignored paying, hoping it would be forgotten or forgiven, your day of reckoning may be at hand.

The long arm of New York officialdom has reached out in an attempt, through the mailing of dunning notices, to collect $502,430 in delinguent tickets from 5,168 residents of the District of Columbia and another $521,535 from 3,182 Virginians. Similar notices also soon will be sent to an uncounted number of Maryland scofflaws.

It is part of a computerized campaign by the financially pressed Big Apple to bring in the money it is owed by visitors who, one officials said, "hid behind their out-of-state registration plates."

"We have received more than $10 million from various states since . . . early in 1976," when the campaign began, Alexander J. Mautner, the city's transportation administrator, said. "This is an excellent rate of debt recovery."

Those who refuse to pay will face the prospect of having civil judgments returned against them in New York courts, Mautner said. This could result in the attachment of any property or bank accounts owned by violators in New York, or the impoundment of any cars driven back into the city.

There is, however, no legal way that New York City could serve arrest warrants or take similar direct action in the Washington area in parking violation cases, officials said.

A spokesman for Mautner identified the top scofflaw from Virginia as Alvardo Delaminna, listed on New York City records at 4118 N. 27th St, Arlington who is reported to owe $9,210 for 287 unpaid tickets.

Telephone and city directories do not list anybody by the name of Delaminna in Arlington. A telephone at the N. 27th Street address is listed in another name.Nobody answered when a reporter tried to call.

The New York spokesman said there is no similar listing of the champion scafflaw for the District of Columbia.

Actually, the spokesman said, the 5,168 notices to Washingtons and 3,182 to Virginians are merely the first of several mailings as clerks dig into the pile of overdue notices. The 5,168 first-round violators from the District got a total of 14,725 separate tickets. New York officials calculate that at least 13,000 Washington owe the city $1.8 million.

Compared to Washington, where the penalty for parking violations begins at a modest $5 and ranges up to a $25 top, New York is costly with $25 for the cheapest transgression, overtime parking.

The average each scofflaw owes in New York is around $40, the spokesman said. The average outstanding ticket in Washington is less than half that amount, local officials said.

In one instance in New York, the New York spokesman said authorities impounded and auctioned off an antique Rolls Royce belonging to a New Jersey scofflaw who owed $11,500 in penalties. The car yielded $10,500. The scofflaw still owes the city the $1,000 balance.

The New York spokesman was not willing to discuss in detail how the city managed to track down the District and Virginia residents, since the city does not have direct access to the records from this area. He indicated, however, that the city obtained the information from commercial sources and from states that have reciprocity with the District and Virginia.

Antia G. Downs, assistant chief deputy clerk for the D.C Superior Court's central violations bureau, said Washington has no nationwide collection program similar to New York Efforts here are pinpointed on violators in the Washington area, she said.