| City: | Porthill, Idaho |
| County: | Boundary County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 9:11:54 AM |
| Population: | No Population Data |
| Area Codes: | 208 / 986 |
| Classification: | PO Box |
| Coordinates: | 48.9202, -116.5570 |
| Quick Link: |
Porthill sits at Idaho's northernmost edge, just south of the Canadian border in Boundary County. At latitude 48.92, this is one of the state's most remote communities, serving as a small border crossing point where Idaho State Highway 1 meets British Columbia. The post office maintains 118 PO Boxes for residents scattered across this isolated corner of the Panhandle.
This is a PO Box Only Zone. There's no alternative mail delivery in Porthill or the surrounding area. The 118 boxes serve roughly 119 residential delivery points, meaning nearly every household relies on the post office for mail access. Despite the PO Box classification, the ZIP includes limited street delivery along Porthill Loop Road, which accounts for 41 delivery records with unit designators, plus 12 business locations.
Porthill functions as a service point for the immediate border area. With no population recorded in Census data and MultiPoint geometry (meaning it's a point location rather than a defined territory), this ZIP represents the post office facility itself, enclosed within the larger ZIP 83805 (Bonners Ferry). The combination of PO Box-only service and proximity to an international border makes Porthill's post office an essential access point for this remote community.
All mail to Porthill addresses should use PO Box format:
PO Box [number]
Porthill, ID 83853Only one street recorded: Porthill Loop Road with 41 delivery records including unit designators.
ZIP Code 83853 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: | 571Source: 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 83853 is located in Boundary County, Idaho, within the Metropolitan Statistical Area (CBSA ) and Idaho's 1st Congressional District. This area has a population of 0 people, about 0.00% of whom live in ZIP Code 83853. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | --Source: Census |
| CBSA Number: | --Source: Census |
| CBSA Type: | --Source: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 0Source: Census |
| MSA: | Source: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 01Source: USPS |
| Congressional Land Area: | 39418.02 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 83853 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 February 1, 2026.