Loudoun Hospital Center: high school students to help in radiology lab, medical-surgical floor, pharmacy, physical medicine and rehabilitation, nursing and the information desk. Students must complete eighth grade by June to participate in the eight-week summer program at Lansdowne and Leesburg. Application deadline is April 15. Joyce Sargent, 703-858-6469.

Keep Loudoun Beautiful Spring Cleanup: clean roadsides and waterways this month. New volunteers are especially needed around Leesburg, Lenah, Neersville, Round Hill and South Riding. 703-771-4231 or www.keeploudounbeautiful.org.

Loudoun County Health Department: medical and non-medical individuals to help with clinic support roles such as registration, data entry, language translation and directing foot traffic if required because of a bioterroism event or epidemic. Must complete Citizen Volunteer Registration Form found at www.loudoun.gov/health/mass.htm or call 703-771-5829.

W&OD TRAIL SURVEY, training before surveys begin May 1. At least four hours monthly during the summer. Information is used for Northern Virginia Regional Park Authority study of economic benefits of trails in Virginia. Laura Torpy, 703-359-4620.

LOUDOUN HERITAGE FARM MUSEUM TOUR GUIDES, teenagers and adults to lead school groups, families and adult visitors during the week and on weekends. Training provided. Museum to open in June. Janis Golden, 703-421-5322.

Sterling Foundation: spring cleanup 8 a.m. Saturday, Park View High School recycling center, 400 W. Laurel Ave. Bring work gloves. 202-408-8282, Ext. 255.

Fresh Air Full Care Campaign: event coordinator for program that helps to fund day care for children so parents can work. Groups needed to help distribute information about the program. Curtis Gans, 703-478-1943.

The Workplace-Fauquier Career Resource Center: receptionist duties, customer service, computer assistance and special projects. 540-349-9103.

Marshall Community Center: help with park and community center beautification projects and organizing forthcoming programs and events. 540-364-3886.

Big Friends Program: Loudoun YMCA , 703-777-9622.

HomeCall Hospice Services Inc.: adults to work with terminally ill patients and their families. Orientation and 16-hour training course provided. Carolyn Carchedi, 1-800-543-0696, for more information or to register for next training session.

SPCA of Northern Virginia: foster homes for dogs and cats rescued from abuse, neglect and abandonment. 703-799-9390 or www.spcanova.org.

Ball's Bluff Regional Park: guides for tour training 7 p.m. Friday, Red Rock Wilderness Overlook Regional Park, Leesburg. Trained interpretive guides lead visitors through events of the 1861 Battle of Ball's Bluff on weekends beginning May 3. Registration, 703-737-7800.

World Heritage: families, couples or single parents (with or without children at home) to host high school exchange student. Judith Henderson, 703-998-0606 or 800-888-9040.

Animal Care and Control: 25 volunteers at least 18 years old to assist staff with bathing, grooming and showing of shelter pets for Project Homeward Bound National Adoptathon Day May 3. Must work two hours a week from April 14-May 2 and four hours May 3. Sign up at county animal shelter, 39820 Charles Town Pike, Waterford. No phone calls. All applicants will be interviewed.

Christmas in April: individuals and groups for April 26. Painting, cleaning, weeding and raking. Plumbers, carpenters and electricians needed. 703-771-7186.

LAUGHS Storytelling Festival: teens to seniors needed for ticket sales, parking, monitoring tents, set up, take down and information and welcome booths for Claude Moore Park event June 21-22. Barbara Sample, 540-338-7973.

Habitat for Humanity: individuals and groups at construction sites. No building experience necessary. Volunteers needed for committees. 703-777-7884.

United Way: help in Leesburg office. 703-777-3920.

Wildlife Rescue League: answer hotline, transport injured or orphaned animals, work art shows, collect and sort donations and help with newsletter. 703-391-8625.

Public Library: volunteers. 703-777-0541.

Literacy Council: tutors. Tara, 703-777-2205.

Area Agency on Aging: drivers for home-delivered meals. 703-777-0257.

Encircling Families Program: mentors matched with a Loudoun family in which a parent or child has a cognitive, physical or emotional disability. Training provided. Aileen, 703-525-9673.

Good Shepherd Alliance Thrift Store: sort and process donations. Public support in finding shelter for the homeless welcomed. Bob Foust, 703-444-5956.

Special Olympics: assisting with summer sports including adult and youth bowling, power lifting, track and field, aquatics and softball. Volunteers must attend committee meetings on the first Monday of each month, 6 p.m. at the Parks, Recreation and Community Services office, 1 Harrison St., Leesburg. New members should call to confirm attendance. 703-777-0438.

Volunteer Fun and Service Day: projects available at all Loudoun community centers and parks, 9 a.m.-1 p.m. May 17. Individuals, families and organized groups are asked to participate. Gardening, landscaping, painting, replacing fences, spring cleaning, planting trees and flowers, trail maintenance, preparing swimming pools, getting ponds ready for fishing, making ice cream and butter the old-fashioned way and taking care of farm animals. 703-777-0343.

Girl Scout leaders: Lorrie Caudle. 703-777-5644.

Adaptive Recreation Programs of Parks, Recreation & Community Service: volunteers experienced with disabled individuals. Trips, clubs and sports. 703-737-8837.

Humane Society, 703-777-2912.

Retired Senior Volunteer Program: people over 55 to help in various areas. 703-777-0505.

Big Brothers/Big Sisters: Michelle St. John, 703-444-0671 or mstjohn@bbbsnca.org.

Arts Council: bookkeeper about 10 hours a week. 703-777-7838.

Community Corrections: data entry, receptionist, processing client intake, financial interviews, pretrial aid. Five hours a week for at least a year. Karen McQuaid, 703-737-8519.

Inova VNA Home Health: companions for homebound patients, one or two hours weekly talking, running errands and doing odd jobs; office duties. Training provided. 703-916-2885.

Loudoun Volunteer Services: applications for seven $500 scholarships for high school seniors, one for each Loudoun public high school with a graduating class and C.S. Monroe Technology Center. Students who have performed volunteer service at church, school or in the community and have a pending acceptance to an accredited college, business or vocational school are eligible. Applications must be received by tomorrow and are available at each school or by calling 703-777-0113.

-- Compiled by Sandy Mauck

Looking for volunteer opportunities? The following groups need help for a day, a week or on a regular basis. Nonprofit groups needing volunteers should send notices to Volunteers, The Washington Post, Suite 100-A, 305 Harrison St. SE, Leesburg, Va. 20175. Notices may also be faxed to 703-777-8437 or e-mailed to lextra@washpost.com. The list is published on a space-available basis on the first Sunday of each month.