Maryland officials are working to get any holdouts when it comes to the COVID-19 vaccine to get their shots.|| COVID-19 updates | Maryland's latest numbers | Get tested | Vaccine Info ||Gov. Larry Hogan announced Wednesday that 5 million COVID-19 vaccines have been administered in Maryland, but it comes as vaccination rates are slipping and thousands of people are missing their second-dose appointments."Get your vaccine. You'll be safe, you won't get sick. If you don't get your vaccine, you could still be in the hospital and you could still die," Hogan said.So officials are enhancing efforts in a new phase of the vaccination effort for Maryland, making it as easy as possible for people to get a shot.Maryland online vaccination site locatorVaccine Data DashboardMaryland vaccination plan FAQsThe governor announced Wednesday that Marylanders can now get a COVID-19 vaccine without an appointment at any of the state's 13 mass vaccination sites, including the large-scale, drive-thru clinic at Ripken Stadium in Aberdeen, Harford County, where its namesake helped public health officials push this message: "We are so proud to be able to play a role in help out and to deliver the message that it is really important to get vaccinated," Orioles Hall of Famer Cal Ripken Jr. said."If, just at the last minute, you're driving by on (Interstate) 95 and you say, 'Hey, I heard there are vaccines. I was watching, I heard Cal Ripken say I could go to the stadium and get a shot,' you can just pull right off and come get your shot," Hogan said."Take the time out and come out to one of these facilities and get vaccinated so we can get back to the normal, normalcy that we all remember," Ripken said.Health officials stressed it's also important to get fully vaccinated, which is why, in addition to doling out first doses of the Pfizer vaccine at the Maryland State Fairgrounds in Timonium, Baltimore County, the site also hosted a second-dose, makeup clinic Wednesday for the Moderna vaccine."I think we all need to get vaccinated everywhere so, you know, we can be healthy," said Angela Tyson, a Baltimore County woman who got her second Pfizer shot Wednesday.Some 16,000 Baltimore County residents are overdue for a second shot, like Helane and Joe Bulmash."Well, it's because my wife had a triple bypass. At the time we were supposed to come, she was in the hospital," Joel Bulmash said."It was a very hard time getting an appointment," Helene Bulmash said. "When I saw this on TV the other day, I jumped and said, 'That's it.'"No-appointment vaccinations are now available at:NEW: Montgomery College (Pfizer, Moderna)20200 Observation Dr.Germantown, MD 20876Walk-up clinics vary. Visit montgomerycountymd.gov/COVID19/vaccine/Germantown.html for regular updates.NEW: Mall in Columbia (Moderna)10300 Little Patuxent Pkwy.Columbia, MD 21044Wednesday-Sunday, 9 a.m.-3 p.m.NEW: Maryland State Fairgrounds (Pfizer)2200 York RoadTimonium, MD 21093Walk-up clinics vary. Visit baltimorecountymd.gov/vaccine for regular updates.NEW: Frederick County (Moderna)800 Oak St.Frederick, MD 21703Walk-up clinics vary. Visit marylandvax.org for regular updates.Six Flags America Theme Park (Pfizer)13710 Central Ave.Bowie, MD 20721Monday-Saturday, 10 a.m.-2 p.m.Regency Furniture Stadium (Pfizer)11765 St. Linus DriveWaldorf, MD 20602Sunday-Thursday, 10 a.m.-3 p.m.Ripken Ironbirds Stadium (Pfizer)873 Long DriveAberdeen, MD 21001Tuesday-Saturday, 9 a.m.-3 p.m.M&T Bank Stadium (Pfizer)*1101 Russell St.Baltimore, MD 21230Monday-Sunday, 9 a.m.-4 p.m.Baltimore Convention Center Field Hospital (Pfizer)1 W Pratt St.Baltimore, MD 21201Monday-Saturday, 10 a.m.-12 p.m.NOTE: Baltimore City residents onlyGreenbelt Metro Station (Pfizer) -- run by FEMA5717 Greenbelt Metro DriveGreenbelt, MD 20740Monday-Tuesday, 9 a.m.-1 p.m.Wednesday-Thursday, 2 p.m.-6 p.m.Friday-Saturday, 11 a.m.-3 p.m.Navy-Marine Corps Memorial Stadium (Moderna)*550 Taylor Ave.Annapolis, MD 21401Wednesday-Sunday, 9 a.m.-3 p.m.Wicomico Youth & Civic Center (Pfizer)500 Glen Ave.Salisbury, MD 21804Tuesday-Saturday, 10 a.m.-2 p.m.Hagerstown Premium Outlets (Pfizer)900 Premium Outlets Blvd.Hagerstown, MD 21740Tuesday-Saturday, 10 a.m.-2 p.m.* - Walk-ups will not be offered at these sites on the days of large sporting events.To guarantee a time slot, Marylanders can immediately book an appointment by visiting covidvax.maryland.gov or by calling the state's COVID-19 Vaccination Support Center at 855-MD-GOVAX (1-855-634-6829). The support center is available seven days a week, from 7 a.m. to 10 p.m.Walk-up times and vaccination capacity may vary, and individuals should be prepared to wait, depending on demand. Individuals in need of a second dose may utilize walk-up lines. Only the Pfizer vaccine is authorized for 16 and 17-year-olds.