Maryland motorists, beware. If you got a parking ticket that remains unpaid, whether issued in Ocean City last summer or in Silver Spring on a recent shopping, you may find it costly and troublesome to get a 1982 automobile license tag.

The state Motor Vehicle Administration warned this week that 130,000 motorists with tickets outstanding anywhere in Maryland must pay them by Monday or they will have next year's tag renewal applications "flagged."

If that happens, MVA registration official William Wilburn said yesterday, applicants must pay a $10 fee on top of all outstanding fines before the tags will be issued. All unpaid parking tickets issued in Maryland communities are reported to the state, which maintains a computerized list of scofflaws.

For those who skipped paying a minimum $12 ticket issued in Baltimore last April, for example, Wilburn said the cost of clearing their personal records after Monday will be steep: the original $12, plus $2 a month overdue penalty, plus the $10 "flagging" fee. By the tag deadline next March, that would add up to $44 --plus the cost of the tags.

Other warnings: the 40,000 motorists who have failed to obey car-repair orders issued by the state police will face the same flagging and $10 fee. And those who let their auto insurance lapse, even for as short a period as one day, must certify that they are covered, and must pay a $100 penalty.

Speaking of fees, here is a reminder that self-employed professionals who earn more than $12,000 a year in the District of Columbia must apply by Tuesday for a license costing $25. The fee was restored this year after the D.C. Court of Appeals overturned an income tax that applied to earnings by professionals, whether they lived in the city or suburbs. For information, call the D.C. Finance and Revenue Department at 727-6103.

Rank may have privileges, but at the National Press Club it doesn't guarantee a low membership number. When former Des Moines sportscaster Ronald Reagan joined the club just before delivering his presidential foreign policy speech a few days ago, he was assigned card No. 2902. Reagan was proposed for membership by former San Diego Union correspondent Lyn Nofziger, who will soon leave his post as Reagan's top political operative.

A three-story home in downtown Lees burg, which includes a wing dating from 1780, was heavily damaged by a two-alarm fire early yesterday.

Michael B. Cavish, who owns the home at 47 N. King St. with his law partner, Roger S. Fraley, arrived home at 2 a.m. and found the place ablaze. He awakened Fraley, who was uninjured. It took about 50 firefighters an hour to bring the blaze under control. Most of the damage was to the interior of the upper two floors.

A decade back, children in the Washington area joined their counterparts around the country in pushing for congressional passage of a law that now provides for rounding up -- rather than slaughtering -- wild horses and burros that overpopulate the western rangelands. Up to now, the government has put the animals up for adoption only out west.

Soon the Adopt-a-Horse program will arrive in our region. The Interior Department's Bureau of Land Management is looking for a boarding farm in northern Maryland -- in Carroll or Baltimore counties -- or in adjacent south central Pennsylvania. It would provide space to board up to 150 of the critters at any one time, a total of about 2,500 a year, while awaiting adoption. Boarding fees being paid out west run between $74 and $97 per animal.

"We need someone who cares about the animals, knows how to handle and feed them properly and can deal with the public on a day-to-day basis," said Roger Hildebeidle, eastern states director for the Interior bureau.

While on the subject of animals, we get word that the Navy has assigned 50 goats to special duty at Oceana Naval Air Station near Norfolk. They eat the grass around the ammunition bunkers which, under Defense Department regulations, is not supposed to be more than 18 inches tall.

"I've had to pull people off priority projects to cut grass," said Lt. Cmdr. John Olson, base weapons officer. "It's become a real burden." Until the goats arrived last Friday, the job required two tractors plus six sailors with hand-held mowers.

Although the job of goatherd is not a normal specialty among the Navy's old salts, the job went to a 26-year veteran, Chief Petty Officer Norman Phelps, who said his experience in the field is nil.