ZIP codes with the most families with kids in Grundy County, IA
These are the 11 ZIP codes in Grundy County with the highest share of households with children, out of 11 with at least 1,000 residents. 50638 (Grundy Center, 35.5%), 50624 (Dike, 34.0%) and 50665 (Parkersburg, 33.5%) lead the list. There is no single "best" ZIP code in Grundy County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.
ZIP codes with the most families with kids in Grundy County
| Rank | ZIP | Mailing city | Households with children under 18 | Residents | Households | Residential mailboxes |
|---|---|---|---|---|---|---|
| 1 | 50638 | Grundy Center | 35.5% | 3,441 | 1,361 | 1,436 |
| 2 | 50624 | Dike | 34.0% | 1,855 | 685 | 480 |
| 3 | 50665 | Parkersburg | 33.5% | 2,693 | 1,112 | — |
| 4 | 50627 | Eldora | 33.3% | 3,276 | 1,219 | — |
| 5 | 50669 | Reinbeck | 29.3% | 2,439 | 1,053 | — |
| 6 | 50604 | Aplington | 29.0% | 1,590 | 663 | 676 |
| 7 | 50621 | Conrad | 27.4% | 1,601 | 656 | — |
| 8 | 50613 | Cedar Falls | 22.5% | 43,867 | 17,126 | — |
| 9 | 50660 | New Hartford | 22.4% | 1,143 | 441 | 364 |
| 10 | 50601 | Ackley | 22.3% | 2,299 | 1,048 | — |
| 11 | 50680 | Wellsburg | 16.6% | 1,027 | 482 | 268 |
How we ranked them
Ranked by the share of households with one or more people under 18 (ACS Data Profile, 2020–2024). The Census Bureau does not publish a margin of error for this share in our files. ZIP codes need at least 1,000 residents to be ranked; 11 of 15 qualify.
Which of these to mail, and why
Households with children buy tutoring, youth sports, pediatric and family dental care, child care, birthday venues and family dining. EDDM reaches every door on a route, so a higher share means more of your pieces land with families.
The top five ZIP codes on this list hold 5,430 households. Open any of them on the route map to see each carrier route's own figures before you choose.
Open 50638 on the EDDM route map
More rankings
- Richest ZIP codes in Grundy County
- ZIP codes with the highest home values in Grundy County
- ZIP codes with the highest homeownership in Grundy County
- ZIP codes with the most new movers in Grundy County
- Youngest ZIP codes in Grundy County
- Oldest ZIP codes in Grundy County
- Fastest-growing ZIP codes in Grundy County
- All Grundy County ZIP codes
Businesses that mail these ZIP codes
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EDDM guides
Frequently asked questions
- Which ZIP code in Grundy County has the highest share of households with children?
- 50638 (Grundy Center), at 35.5%, among 11 ZIP codes with at least 1,000 residents.
- How is this ranking calculated?
- Ranked by the share of households with one or more people under 18 (ACS Data Profile, 2020–2024). The Census Bureau does not publish a margin of error for this share in our files.
- 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.