ZIP Codes of Boundary County, ID

Population & People
Population & People
Total Population
13,153
Household Income
Household Income
Median Income
$63,879
Housing
Housing
Total Housing Units
5,573
Business & Economy
Business & Economy
Total Businesses
440
Employment
Employment
Employment Rate
47.96%
Education
Education
Bachelor's Degree+
23.89%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 5 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:5 ZIP Codes (3 Standard, 2 PO Box, 0 Unique) [See All]
Area Codes:208 / 986
Timezone:Pacific (GMT -08:00)
Local Time:11:53:14 PM
Population:13,153 [See All]
FIPS:16021
Land Area:1,204 sq mi
Water Area:9 sq mi
Coordinates:48.8115, -116.3436
Quick Link:
https://www.zip-codes.com/county/id-boundary.asp
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Idaho's #25 most populous county
13,153 residents across 5 ZIPs — #25 of 46 Idaho counties.

Standout ZIPs in this County


Most Populous
Bonners Ferry · 9,174 people
69.7% of county total
Highest Income
Moyie Springs · $72,695 median
1.1× county average
Largest Land Area
Bonners Ferry · 995.8 sq mi
Spans the most ground
Fastest Growth
Moyie Springs · 23.9% (10-yr)
1,777 → 2,202 residents
Most Educated
Moyie Springs · 30.0% bachelor's+
503 of 1,674 adults 25+

Things worth knowing about Boundary County


13,153 residents live across 5 ZIPs covering 1,204 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 10,903 to 13,153 from 2014 to 2024 — a +20.6% change. 4 ZIPs gained residents, 0 lost.

The county's wealthiest ZIP 83845 (Moyie Springs, $72,695 median) and poorest ZIP 83847 (Naples, $48,859) are 15.7 miles apart — a 1.5× income gap across local geography.

Median home values vary 1.5× across this county — from $373,700 in 83845 (Moyie Springs) to $545,000 in 83847 (Naples).

Density varies across the county — from 9 people/sq mi in 83805 (Bonners Ferry) to 34 in 83845 (Moyie Springs).

Educational attainment ranges from 15.2% bachelor's+ in 83847 (Naples) to 30.0% in 83845 (Moyie Springs) — the breadth of educational profiles across the area.

Within Idaho, this is the #25 most populous of 46 counties and ranks #35 for median household income with the #13 fastest decade growth .

Weighted by population, the typical household earns about $67,743 across the county — reflecting what a typical resident sees, not a simple ZIP average.

23.9% of adults age 25+ hold a bachelor's degree or higher (2,196 of 9,192 reporting).

3 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Boundary County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
1,204
square miles
Avg density
10.9
people per sq mi
Population
13,153
across 5 ZIPs
Bonners Ferry
995.8 sq mi
9,174 residents
Naples
144.5 sq mi
1,714 residents
Moyie Springs
64.0 sq mi
2,202 residents

Single-ZIP anchor

One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.

Bonners Ferry

All ZIP Codes in Boundary County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
83805Bonners FerryStandard9,174$70,083995.818.8%
83845Moyie SpringsStandard2,202$72,69564.023.9%
83847NaplesStandard1,714$48,859144.522.0%
83826EastportPO Box630.0
83853PorthillPO Box0.0

Adjacent & Nearby Counties