Frontenac, MO ZIP Codes
One ZIP code serves Frontenac, Missouri: 63131. Together they are home to 17,935 residents in 6,511 households. That is more than the 3,701 people counted inside Frontenac city limits, because these ZIP codes reach past its boundary.
Frontenac city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 3,701 |
| Households | 1,197 |
| Median household income | $233,425 |
| Median home value | $979,800 |
| Median age | 46.3 |
| Median rent | not published |
All 1 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 17,935 |
| Households (sum of ZIP codes) | 6,511 |
| Median household income, range across ZIP codes | $225,493 (63131) to $225,493 (63131) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $225,493 |
| Homeowners | 93.7% |
| Households with kids under 18 | 37.2% |
| Moved in the past year | 9.0% |
| Carrier routes in EDDM2GO's route library | 25 routes, 6,482 homes (1 of 1 ZIP codes) |
Every ZIP code in Frontenac
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 63131 | Saint Louis | 17,935 | 6,511 | $225,493 | $778,100 | 93.7% | 37.2% | 9.0% | 25 | 7,413 | 21% of its land |
A ZIP code is listed for Frontenac when at least 10% of its land lies inside Frontenac city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Frontenac. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Frontenac.
Counties
- St. Louis County — 46 ZIP codes
Nearby cities sharing these ZIP codes
- Town and Country — 3 ZIP codes
- Des Peres — 2 ZIP codes
Price a mailing to Frontenac ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Frontenac, MO?
- 63131. A ZIP code is listed for Frontenac when at least 10% of its land lies inside Frontenac city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Frontenac.
- What is the population of Frontenac, MO?
- The Census Bureau counts 3,701 residents inside Frontenac city limits (ACS 2020–2024). The 1 ZIP code that serve Frontenac hold 17,935 residents in all.
- What is the median household income in Frontenac, MO?
- $233,425 inside Frontenac city limits, per the Census Bureau. Across its ZIP codes the medians run from $225,493 to $225,493.
- How many carrier routes and mailboxes are in Frontenac, MO?
- For the 1 of 1 ZIP codes in EDDM2GO's stored route library: 25 carrier routes reaching 6,482 residential and 932 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.