Missouri
What is the counties where testing is required for Missouri?
For Missouri, counties where testing is required is St. Louis City St. Louis County St. Charles County Jefferson County; vehicles covered / exempt is Gas-powered vehicles 1996 and newer or diesel powered vehicles 1997 and newer; program / authority is Gateway VIP, verified against its source on 2026-08-19.
Gas-powered vehicles 1996 and newer or diesel powered vehicles 1997 and newer 8,500 pounds or less. Registered in the following areas: Locate a GVIP Station near you St. Louis City St. Louis County St. Charles County Jefferson County When do I get a test?
— gatewayvip.mo.gov, retrieved 2026-08-19
- State
- Missouri our reading
- Counties where testing is required
- St. Louis City St. Louis County St. Charles County Jefferson County verified
- Vehicles covered / exempt
- Gas-powered vehicles 1996 and newer or diesel powered vehicles 1997 and newer verified
- Program / authority
- Gateway VIP
- How often
- Odd vehicle model years test in odd years. Even vehicle model years test in even year. also on this page
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
The same source also states
Odd vehicle model years test in odd years. Even vehicle model years test in even year.
— gatewayvip.mo.gov, retrieved 2026-08-19
Source
- gatewayvip.mo.govhttps://gatewayvip.mo.gov/need-test/