| City: | Frontier, Michigan |
| County: | Hillsdale County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 8:15:31 PM |
| Population: | No Population Data |
| Area Code: | 517 |
| Classification: | PO Box |
| Coordinates: | 41.7818, -84.6044 |
| Quick Link: |
Frontier is a small rural community in Hillsdale County, Michigan. This is designated as a PO Box Only Zone, meaning there's no alternative mail delivery available. The Frontier post office maintains 34 PO Boxes and serves 6 business delivery points, providing essential mail services for the immediate area and surrounding territory.
Mail delivery includes one rural route serving E Montgomery Road and the limited residential development nearby. The post office serves as the only postal access point for this community. Frontier is enclosed within the larger ZIP 49242 service area, but maintains its own post office classification dating back to before October 2004.
All mail to Frontier should use the following format:
PO Box [number]
Frontier, MI 49239For the limited rural route addresses, use:
[House Number] E Montgomery Rd
Frontier, MI 49239Single street with minimal delivery infrastructure.
ZIP Code 49239 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: | 61Source: 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 49239 is located in Hillsdale County, Michigan, within the Hillsdale, MI Metropolitan Statistical Area (CBSA 25880) and Michigan's 5th Congressional District. This Micro area has a population of 45,658 people, about 0.00% of whom live in ZIP Code 49239. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Hillsdale, MISource: Census |
| CBSA Number: | 25880Source: Census |
| CBSA Type: | MicroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 45,658Source: Census |
| MSA: | Source: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 05Source: USPS |
| Congressional Land Area: | 2348.7 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 49239 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.