Community Interest

St. Charles County Public Health to Offer Free COVID-19 Vaccinations

Following authorization granted this month by the Missouri Department of Health and Senior Services, the U.S. Food and Drug Administration and the Centers for Disease Control and Prevention, the St. Charles County Department of Public Health will begin offering COVID-19 vaccinations for children ages 6 months and older on Monday, June 27.

Both Pfizer/BioNTech and Moderna COVID vaccines are available for this age group through the department’s Immunization Clinic (located at 1650 Boone’s Lick Road in St. Charles.) 

How to Schedule Appointments

Vaccination appointments are required and are available Mondays, Wednesdays, and Fridays 8:30 – 11:30 a.m., and 1-4 p.m. Appointments can be made using the online scheduling system at or by calling the COVID Hotline at 636-949-1899. 

Other family members and caregivers may join these appointments to receive their first, second and booster doses, according to eligibility. Please note: Individuals younger than 18 years of age must be accompanied by a parent or guardian at the time of the vaccination. 

To improve efficiency during the appointment, individuals should arrive 10 minutes prior to their scheduled time and bring the following:

  • Photo identification for the parent/guardian accompanying the child.
  • The individual’s personal vaccination card or a photo of the card (for those seeking second or booster doses). 

Information on additional vaccination opportunities around St. Charles County is provided at

Dosage Information

Parents and caregivers should speak with their pediatrician to determine which vaccine is preferred. The Pfizer/BioNTech vaccine (for those 6 months to 4 years) is administered using three, 3-microgram doses. For those 6 months to 5 years, the Moderna vaccine is given in two, 25-microgram doses; for those 6-11 years, the shot regimen is two, 50-microgram doses. 



Pfizer/BioNTech vaccine

Moderna vaccine


Ages 6 months to 4 years

  • Requires 3 doses. 3 weeks between doses 1 and 2    8 weeks between doses 2 and 3

Ages 6 months to 5 years

  • Requires 2 doses, 4 weeks apart


Ages 5-11

  • Requires 2 doses, 3 weeks apart

Ages 6-11

  • Requires 2 doses, 4 weeks apart


Ages 12+

  • Requires 2 doses, 3 weeks apart

Ages 12+

  • Requires 2 doses, 4 weeks apart


Ages 5+

  • Administered at least 5 months following final dose of primary series
  • Second booster for those 50+ at least 4 months after first booster

Ages 18+

  • Administered at least 5 months following final dose of primary series
  • Second booster for those 50+ at least 4 months after first booster

More information

For additional information on St. Charles County’s efforts to reduce the spread of illness, visit For questions about symptoms or testing, call the St. Charles County COVID-19 Information Hotline at 636-949-1899 or speak with a medical provider. 

Media Contact:  Doug Bolnick, Public Information Officer, 636-949-7408 or This email address is being protected from spambots. You need JavaScript enabled to view it. 

About the St. Charles County Department of Public Health
Through the efforts of its three divisions — Environmental Health and Protection, Health Services and Humane Services — the St. Charles County Department of Public Health provides a wide range of services that enhance the well-being of the community. To learn how the department assists this region or to find out about volunteer opportunities with any of the divisions, visit or call 636-949-7400. 

About St. Charles County
St. Charles County, Missouri, founded in 1812, is one of the fastest-growing counties in Missouri. With a population of 405,262, it is the state’s third-largest county. It is home to 21 scenic county parks of which four are in reserve, encompassing 4,197 acres. 

With one of the largest economies in the state, St. Charles County is home to multinational companies including General Motors, Citi, MasterCard Worldwide and Boeing. It is ranked among the top 25 counties in the nation in high-tech job growth by the Progressive Policy Institute and consistently has the lowest unemployment rate in the Metropolitan St. Louis area. 

St. Charles County Government has more than 1,170 employees in more than 30 departments and offices who work to make the county an excellent place to live, work and shop. For more information, please visit