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New coronavirus testing sites continue to open across the region, as government leaders say testing and tracking people who have been exposed is key to controlling the spread of the virus.

Maryland is opening a testing site at Six Flags America in Prince George’s County, the jurisdiction with the largest number of cases in the state. The state’s residents can receive the test free of charge, without a doctor’s note or appointment, starting Friday at the amusement park in Upper Marlboro.

Gov. Larry Hogan (R) has been criticized in recent weeks by local leaders, who say the state needs to provide jurisdictions more tests for their residents. The state recently started testing people who have been exposed to the virus but are not showing symptoms.

In Virginia, Gov. Ralph Northam (D) said last week that the state has neared his goal of 10,000 daily tests. The state recently began offering tests to people without symptoms, opening some one-day sites that quickly ran out of kits because of the demand.

D.C. Mayor Muriel E. Bowser (D) has set up two testing sites in the city and is especially encouraging people who have symptoms, are front-line workers, live in institutional settings or are 65 or older to get tested.

Here are details of places you can get tested in the region:

Where can I get tested in Virginia?

●Virginia’s health department lists 160 testing locations on its website here, allowing searches according to Zip code.

AllCare/Synergy Immediate Care in Vienna has a drive-through testing site at 1980 Gallows Road. A telemedicine appointment must be conducted first. Call 703-942-5331.

Patient First Manassas Urgent Care in Manassas, at 9715 Liberia Ave. Patients must be at least 5 years old. For an appointment, call 571-229-1797.

Lorton Immediate Care-Family Medicine and Urgent Care at 7740 Gunston Plaza Dr. in Lorton. For an appointment, call 703-339-5858

Virginia Hospital Center in Arlington has a drive-through testing site at 1429 N. Quincy St. It is by appointment only for Arlington residents, employees or patients of the hospital’s medical staff and requires a doctor’s referral.

Kaiser Permanente has drive-through testing locations for its members in Woodbridge and Tysons. The sites are open for members from 9 a.m. to noon and from 1 to 4 p.m. seven days a week and require a doctor’s order and appointment.

Inova Health System is screening patients and testing those with a doctor’s orders at three of its urgent-care centers, at Dulles South, North Arlington and Tysons. All three clinics are open daily from 8 a.m. to 8 p.m.

Medstar Health has a testing site at its urgent-care facility in Alexandria. Patients must be screened on MedStar’s online platform or referred by primary-care providers.

PM Pediatrics in Fairfax County has a drive-up coronavirus testing center at 11056 Lee Hwy., open from 10:30 a.m. to 7:30 p.m. Call 703-552-5437. Patients of any age may be tested if they register for a telemedicine consult at this site.

●Prince William County launched drive-through testing sites at Walmart parking lots in Dumfries and Manassas. The Dumfries location is at 17041 Jefferson Davis Hwy. The Manassas site is at 8386 Sudley Rd. Tests are done only by appointments, which can be made through this website.

Where can I get tested in Maryland?

●The state has set up testing at vehicle emissions sites in White Oak (Montgomery County), Clinton and Hyattsville (Prince George’s County), Columbia (Howard County), Glen Burnie (Anne Arundel County), Hagerstown (Washington County), Waldorf (Charles County), Owings Mills (Baltimore County), Prince Frederick (Charles County) and Bel Air (Harford County). Patients need a doctor’s order and an appointment, which will be granted only to Maryland residents who are symptomatic and at high risk for complications from covid-19.

● The state is providing free tests at Six Flags America in Upper Marlboro starting Friday. The testing site does not require a doctor’s note or appointment.

● Drive-through, appointment-free testing is available at the Timonium Fairgrounds in Baltimore County, the Glen Burnie vehicle emissions inspection site in Anne Arundel County and the Hyattsville vehicle emissions site in Prince George’s County. Testing will become available at the Clinton vehicle emissions site this week. There is no out-of-pocket cost, and no doctor’s referral needed.

● Drive-through testing is available at 17 CVS pharmacies across the state. Patients must register in advance online at CVS’s website to schedule an appointment. The pharmacies are in Anne Arundel, Carroll, Charles, Frederick, Howard, Montgomery, Prince George’s and Worcester counties, as well as Baltimore City.

● Walmart offers testing at three locations, in Dorchester, Frederick and Wicomico Counties, three days a week by appointment here.

● Rite Aid is screening patients at two sites, in Anne Arundel and Baltimore Counties.

Prince George’s County is offering tests by appointment at 3003 Hospital Dr. in Cheverly, near Prince George’s Hospital Center. To schedule a visit, call 301-883-6627.

Kaiser Permanente has testing sites for its members in Gaithersburg, Largo and South Baltimore. The sites require a doctor’s order and appointment. The hours of operation vary between each location in the state. For more information, go here.

●Adventist HealthCare Shady Grove Medical Center has coronavirus testing only for critically ill patients who are likely to need hospitalization, spokeswoman Lydia Parris said.

●MedStar Health has testing sites at all urgent-care facilities in the region, including in Bel Air, Belcamp, Charlotte Hall, Chevy Chase, Federal Hill, Gaithersburg, Hyattsville, Perry Hall, Towson, Waldorf and Wheaton. Patients must be screened on MedStar’s online platform or referred by primary-care providers.

●Montgomery County health officials are also testing at a drive-through site at the Wheaton Community Recreation Center and the Upcounty Regional Services Center in Germantown, by appointment only.

PM Pediatrics has testing sites at 12254 Rockville Pike in Rockville (301-230-2767) and at 1803 York Road in the Lutherville-Timonium area (443-432-2767). Patients of any age must first get a telemedicine consult.

Holy Cross Health hospitals, in Silver Spring and Germantown, have tents to triage patients with influenza-like illnesses, including covid-19. Patients then may be tested in the emergency room, spokeswoman Kristin Feliciano said. People should first contact their primary-care provider and call the hospital before turning up there.

●Suburban Hospital in Bethesda, part of the Johns Hopkins network, offers testing for patients who do not need emergency care and who have been referred by their Johns Hopkins doctor.

●The private health-care provider Kelly Goodman NP and Associates is doing drive-through testing at the Waldorf School in Bethesda, available Wednesdays and Fridays. Its Clarksville office will also offer drive-through testing on Fridays. To schedule a test, call 202-684-7167.

●Fast Track Urgent Care provides drive-through coronavirus testing seven days a week in Kensington, at 10540 Connecticut Ave. It accepts most insurances and waives all insurance co-pays. Patients must first be evaluated via a telemedicine visit. To schedule a test, go to fastrackmd.com or call 800-689-1341.

Where can I get tested in the District?

●The city has set up testing sites at United Medical Center, the city’s only public hospital, a Howard University clinic in Ward 7 and the University of the District of Columbia Community College’s Bertie Backus campus.

Patients must be D.C. residents and need to be screened and make an appointment by calling the Testing Triage Call Center, at 855-363-0333. The call center is open 8:30 a.m. to 4:30 p.m. Mondays through Fridays.

●One Medical allows anyone who thinks they have covid-19 symptoms to sign up for a virtual assessment through their app, which can be downloaded here. If testing is deemed necessary, One Medical will refer patients to a testing site, including a new outdoor location in Georgetown.

●Farragut Medical and Travel Care offers tests to people who suspect they have or had the coronavirus. No doctor’s order is required. Email info@farragutmedical.com or call 202-775-8500 for an appointment. Patients are asked to wear face masks to the office, at 818 Connecticut Ave. NW. Insurance is not accepted, but the company will provide documentation to submit to your insurer. The standard throat swab, which includes a flu and strep test, costs $525. A finger-prick test for those who may have acquired immunity costs $290.

●AllCare Family Medicine and Urgent Care will schedule drive-in coronavirus tests for people with appointments between 6 and 7 p.m. weekdays and noon to 1 p.m. weekends at 1710 Rhode Island Ave. NW. Patients must first be evaluated through a telemedicine visit at allcarefamilymed.com.

Children’s National Hospital has testing for children only, on the campus of Trinity Washington University. A referral from a pediatrician is required, and tests are done three days per week, depending on the weather.

Kaiser Permanente’s D.C. clinic, near the Kaiser Permanente Capitol Hill Medical Center, offers testing from 11 a.m. to 5 p.m. seven days a week. The site — as well as Kaiser sites in the suburbs — requires a doctor’s order and appointment.

●Medstar Health is testing patients at locations in Adams Morgan and Capitol Hill. Patients must be screened on MedStar’s online platform or referred by primary-care providers.

Unity Health Care offers screening and testing at its Minnesota Avenue NE, Kenilworth Terrace NE and 14th Street NW locations.

George Washington University Hospital in the District’s Foggy Bottom neighborhood offers drive-through testing by appointment at 20th and H streets NW. Patients can also walk up to be tested at 22nd and I streets NW. Patients need a doctor’s order for the test, and health-care providers can schedule a testing time at gwcovid19testing.com.

Do you have additional information about testing sites in the District, Maryland or Virginia? Please send it to covidlocaltesting@washpost.com. This article is being updated as new information becomes available.

Erin Cox, Kyle Swenson and Rebecca Tan contributed to this report.