Although ghosts and goblins traditionally are free to haunt the area in search of tricks and treats on Oct. 31, many Maryland counties and municipalities have regulations on Halloween activities.

Trick-or-treaters are invited to roam most of Prince George's County from 6 to 9 p.m. Halloween night, according to police, who say they will have extra patrols in residential areas during those hours.

Police advise parents of trick-or-treaters to accompany their children as they make the rounds throughout the neighborhood. Police recommend that prospective ghouls wear light-colored clothing and carry flashlights and that they do not wear masks that block vision or enter houses of strangers.

Charles and Anne Arundel County police have no official policy regarding Halloween, but both will have extra patrols on duty.

Although most follow county guidelines, some muncipalities have regulations regarding trick-or-treating, while others prohibit it and are planning city-sponsored parties instead.

The following is a list of Halloween policies and activities.

CHARLES COUNTY

La Plata: trick-or-treating on Wednesday from 7 to 9 p.m.

Indian Head: trick-or-treating on Wednesday from 6 to 8 p.m. for children under 12 only.

PRINCE GEORGE'S COUNTY

Berwyn Heights: Recreation Council is sponsoring "Great Halloween," Saturday, 6:30-8:30 p.m., Berwyn Heights Community Gym, 6200 Pontiac St. Costume contest, games, prizes and refreshments. Free admission.

Bladensburg: Residents are asked to keep porch light on if offering treats during county trick-or-treating hours. Halloween party Saturday, noon-3 p.m., Bladensburg Elementary School, 5150 Annapolis Rd. Costume contest and pumpkin decorating contest (bring decorated or carved pumpkins to event). Free admission.

Cheverly: Trick-or-treating on Wednesday from 6 to 8 p.m., children up to sixth grade only. Residents are asked to keep porch lights on if offering treats. Recreation Council Halloween party Sunday, 2 p.m., community center, 6401 Forest Rd., for children up to sixth grade. Costume contest and treats. Free admission.

College Park: Youth Services Department is sponsoring "Halloween Thing," on Saturday (rain date, Nov. 3), 10 a.m. to noon at Duvall Field on Rhode Island Avenue in north College Park. Costume contest, refreshments, games, pumpkin decorating contest (bring already decorated or carved pumpkin), coloring contest, and haunted house. Free admission.

Colmar Manor/Cottage City: both are prohibiting trick-or-treating. Annual joint Halloween parade at the Cottage City Fire Department. Costume parade and treat bags for residents only; must have ticket provided by towns' administration.

District Heights: Residents are asked to keep porch light on if offering treats during county trick-or-treating hours. Marshmallow roast with ghost stories on Sunday at the municipal center ballfield. Halloween party Wednesday, 6-8 p.m., municipal center, 2000 Marbury Rd. Costume judging, games and haunted house. Free admission.

Edmonston: Halloween party Saturday, 2-4 p.m., town hall, 5005 52nd Ave. Games and costume parade. Admission: a canned good for the needy during the holiday season.

Fairmount Heights: Halloween party, Wednesday, 6-8 p.m. town hall, 717 60th Place. Games, costume contest and treat bags. Residents were asked to donate candy for the party at the town hall.

Forest Heights: Trick-or-treating, Tuesday, 5-7 p.m. Residents are asked to keep porch lights on if they are offering treats.

Glenarden: Halloween party, Wednesday, 6-8 p.m. recreation center, 8615 McClean Ave. Pumpkin decorating, costume contest, treats and bands. Ages 3-13. Free admission.

Greenbelt: Trick-or-treating, Wednesday, 6-8 p.m.; residents of houses are asked to keep porch lights on and condominium and apartment residents are asked to tie a white cloth on the doorknob if they are offering treats. Recreation Council is sponsoring a Halloween party Tuesday, 3:30-5:30 p.m., Greenbelt Youth Center, 99 Center Way. Movie, costume judging and parade. Free admission.

Hyattsville: Halloween party, Wednesday, 6-9 p.m., Magruder park, 40th Avenue and Hamilton Street. Costume judging, hobo dinner, haunted house, movie and bonfire. Free admission.

Laurel: Parks and Recreation Council Halloween party Saturday, 2-3:30 p.m., Laurel Armory at Montgomery and Fifth Street. Costume and pumpkin decorating contest. Ages 11 and under. Free admission.

Morningside: Recreation Council is sponsoring "Halloween Fun" Wednesday. Drop off decorated pumpkins at the town hall, 6901 Ames St., at 5 p.m. for judging; trick-or-treat through the town from 6:30 to 7:30; and return to the town hall for costume and pumpkin judging at 8 p.m.

Mount Rainier: Jaycees are sponsoring a Haunted House, tomorrow through Nov. 2, 7:30-11 p.m., Old Mount Rainier Junior High School, Queens Chapel Road and 30th Street. Admission: $3.

New Carrollton: Men's Club is sponsoring a Halloween party Saturday, Charles Carroll Middle School, 12:30 p.m. Treats, costume parade to haunted house at Vera Cope Winebach park on Westbrook Drive. Ages 12 and under. Free admission.

Riverdale: Prohibits trick-or-treating. Halloween party Saturday, Riverdale Elementary School, 5006 Riverdale Rd., 4:30 p.m. to midnight. Costume contest, refreshment, games, refreshments and dance. All ages. Free admission.

Seat Pleasant: Recreation Council is sponsoring a Halloween party Sunday, 4-6 p.m. Seat Pleasant actvities center, 527 Addison Rd. Games, movies, and treats. For ages 9 and under. Free admission.