St. Louis, MO-IL metro area ZIP codes
The St. Louis, MO-IL metropolitan statistical area (CBSA 41180) covers 15 counties in Illinois and Missouri and 284 ZIP codes.
- ZIP codes
- 284
- Population
- 2,815,268
- Avg. median income
- $86,900population-weighted
- Counties
- 15
Click anywhere on the map to see which ZIP code it's in.
Counties in the St. Louis, MO-IL area
- Bond County, IL
- Calhoun County, IL
- Clinton County, IL
- Jersey County, IL
- Macoupin County, IL
- Madison County, IL (central)
- Monroe County, IL (central)
- St. Clair County, IL (central)
- Franklin County, MO
- Jefferson County, MO (central)
- Lincoln County, MO
- St. Charles County, MO (central)
- St. Louis County, MO (central)
- Warren County, MO
- St. Louis city, MO (central)
ZIP codes in the St. Louis, MO-IL area
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Frequently asked questions
How many ZIP codes are in the St. Louis, MO-IL metro area?
284 ZIP codes, based on each ZIP code's main county.
Which counties make up the St. Louis, MO-IL area?
Bond County, IL, Calhoun County, IL, Clinton County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, St. Clair County, IL, Franklin County, MO, Jefferson County, MO, Lincoln County, MO, St. Charles County, MO, St. Louis County, MO, Warren County, MO and St. Louis city, MO.
What is an MSA?
A metropolitan statistical area (MSA) is a core city of 50,000+ people plus the surrounding counties tied to it by commuting, as defined by the U.S. Office of Management and Budget. Micropolitan areas have a core of 10,000–50,000. Together they are called core-based statistical areas (CBSAs).