Youngest ZIP codes in Kootenai County, ID
These are the 10 ZIP codes in Kootenai County with the lowest median age, out of 10 with at least 1,000 residents. 83854 (Post Falls, 36.9), 83815 (Coeur D Alene, 40.1) and 83858 (Rathdrum, 40.7) lead the list. There is no single "best" ZIP code in Kootenai County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.
Youngest ZIP codes in Kootenai County
| Rank | ZIP | Mailing city | Median age | Residents | Households | Residential mailboxes |
|---|---|---|---|---|---|---|
| 1 | 83854 | Post Falls | 36.9 ±1.6 | 54,851 | 20,056 | 23,719 |
| 2 | 83815 | Coeur D Alene | 40.1 ±0.9 | 41,405 | 16,657 | — |
| 3 | 83858 | Rathdrum | 40.7 ±2.2 | 20,137 | 7,243 | 8,624 |
| 4 | 83801 | Athol | 43.1 ±3.6 | 7,553 | 2,622 | — |
| 5 | 83869 | Spirit Lake | 44.9 ±6.3 | 5,504 | 2,045 | — |
| 6 | 83835 | Hayden | 45.0 ±2.7 | 24,238 | 9,110 | — |
| 7 | 83814 | Coeur D Alene | 46.6 ±2.6 | 26,059 | 11,965 | 14,361 |
| 8 | 83876 | Worley | 50.1 ±5.2 | 1,563 | 622 | 798 |
| 9 | 83833 | Harrison | 59.8 ±5.5 | 1,365 | 695 | — |
| 10 | 83810 | Cataldo | 64.0 ±8.9 | 1,412 | 638 | 510 |
How we ranked them
Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 10 of 11 qualify.
Which of these to mail, and why
Younger ZIP codes skew toward renters, students and young families: fitness, quick-service food, apartments, entertainment and first-time-buyer offers.
The top five ZIP codes on this list hold 48,623 households. Open any of them on the route map to see each carrier route's own figures before you choose.
Open 83854 on the EDDM route map
More rankings
- Richest ZIP codes in Kootenai County
- ZIP codes with the highest home values in Kootenai County
- ZIP codes with the highest homeownership in Kootenai County
- ZIP codes with the most families with kids in Kootenai County
- ZIP codes with the most new movers in Kootenai County
- Oldest ZIP codes in Kootenai County
- Fastest-growing ZIP codes in Kootenai County
- All Kootenai County ZIP codes
Businesses that mail these ZIP codes
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EDDM guides
Frequently asked questions
- Which ZIP code in Kootenai County has the lowest median age?
- 83854 (Post Falls), at 36.9 (±1.6), among 10 ZIP codes with at least 1,000 residents.
- How is this ranking calculated?
- Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024).
- Why are some ZIP codes missing?
- ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.