Youngest ZIP codes in St. Clair County, MI
These are the 21 ZIP codes in St. Clair County with the lowest median age, out of 21 with at least 1,000 residents. 48064 (Casco, 39.4), 48060 (Port Huron, 39.5) and 48074 (Smiths Creek, 40.6) lead the list. There is no single "best" ZIP code in St. Clair 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 St. Clair County
| Rank | ZIP | Mailing city | Median age | Residents | Households | Residential mailboxes |
|---|---|---|---|---|---|---|
| 1 | 48064 | Casco | 39.4 ±4.3 | 4,180 | 1,521 | 1,810 |
| 2 | 48060 | Port Huron | 39.5 ±0.8 | 39,342 | 17,167 | 17,347 |
| 3 | 48074 | Smiths Creek | 40.6 ±2.8 | 9,624 | 3,796 | 4,035 |
| 4 | 48097 | Yale | 40.8 ±2.6 | 5,418 | 2,184 | — |
| 5 | 48063 | Columbus | 40.9 ±4.5 | 4,206 | 1,609 | — |
| 6 | 48027 | Goodells | 41.1 ±5.3 | 3,187 | 1,142 | — |
| 7 | 48014 | Capac | 41.4 ±7.1 | 4,294 | 1,806 | 1,381 |
| 8 | 48023 | Fair Haven | 43.2 ±5.8 | 5,031 | 2,094 | — |
| 9 | 48079 | Saint Clair | 45.3 ±2.2 | 12,711 | 5,348 | — |
| 10 | 48040 | Marysville | 45.4 ±4.0 | 9,925 | 4,322 | 4,520 |
| 11 | 48006 | Avoca | 46.2 ±1.0 | 3,889 | 1,528 | 1,486 |
| 12 | 48022 | Emmett | 46.7 ±9.0 | 2,530 | 1,077 | 978 |
| 13 | 48032 | Jeddo | 47.4 ±4.8 | 1,871 | 752 | 870 |
| 14 | 48041 | Memphis | 47.5 ±3.8 | 4,302 | 1,829 | — |
| 15 | 48039 | Marine City | 47.6 ±2.9 | 7,437 | 3,266 | — |
| 16 | 48059 | Fort Gratiot | 48.6 ±2.3 | 15,499 | 6,654 | — |
| 17 | 48002 | Allenton | 48.6 ±5.9 | 3,120 | 1,345 | 1,223 |
| 18 | 48049 | North Street | 49.1 ±5.6 | 5,468 | 2,199 | — |
| 19 | 48001 | Algonac | 52.4 ±2.3 | 11,224 | 5,143 | — |
| 20 | 48054 | East China | 53.3 ±2.1 | 7,188 | 2,933 | 3,114 |
| 21 | 48028 | Harsens Island | 65.6 ±4.7 | 1,272 | 684 | 890 |
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; 21 of 21 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 26,277 households. Open any of them on the route map to see each carrier route's own figures before you choose.
Open 48064 on the EDDM route map
More rankings
- Richest ZIP codes in St. Clair County
- ZIP codes with the highest home values in St. Clair County
- ZIP codes with the highest homeownership in St. Clair County
- ZIP codes with the most families with kids in St. Clair County
- ZIP codes with the most new movers in St. Clair County
- Oldest ZIP codes in St. Clair County
- Fastest-growing ZIP codes in St. Clair County
- All St. Clair County ZIP codes
Businesses that mail these ZIP codes
Map it and price it
EDDM guides
Frequently asked questions
- Which ZIP code in St. Clair County has the lowest median age?
- 48064 (Casco), at 39.4 (±4.3), among 21 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.