| City: | Treloar, Missouri |
| County: | Warren County |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 12:07:55 AM |
| Population: | No Population Data |
| Area Code: | 636 |
| Classification: | PO Box |
| Coordinates: | 38.6445, -91.1876 |
| Quick Link: |
Treloar is a small rural community in Warren County, Missouri. The ZIP code 63378 serves as a legacy postal designation with minimal current delivery activity. Only 2 ZIP+4 records exist for this location, both on M K T Street (likely named for the Missouri-Kansas-Texas railroad that historically passed through the area).
This isn't a PO Box Only Zone, and street delivery is available. The post office operates with one rural carrier route serving the immediate area. With zero population recorded in the Census data and no housing units in the ZCTA boundary, the ZIP functions primarily as a point location within the larger service area of neighboring ZIP 63383, which encloses this location.
Mail addressed to Treloar, MO 63378 is accepted by the postal system. The facility operates as a Post Office (facility code P) without city carrier delivery. The ZIP was introduced before October 2004, when postal system tracking began.
The single street name references the Missouri-Kansas-Texas railroad historical presence.
ZIP Code 63378 is designated for PO Box delivery only; business establishment and employment data are not available.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 1Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 0Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $0Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 63378 is located in Warren County, Missouri, within the St. Louis, MO-IL Metropolitan Statistical Area (CBSA 41180) and Missouri's 2nd Congressional District. This Metro area has a population of 2,809,414 people, about 0.00% of whom live in ZIP Code 63378. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | St. Louis, MO-ILSource: Census |
| CBSA Number: | 41180Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 2,809,414Source: Census |
| MSA: | St. Louis, MO-IL MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 02Source: USPS |
| Congressional Land Area: | 465.76 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | --Source: Census |
| Place Name: | --Source: Census |
We could not locate which school district 63378 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on January 1, 2026.