Which ZIP code in New Castle County has the highest share of households with children?

19938 (Clayton), at 43.6%, among 23 ZIP codes with at least 1,000 residents.

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.

ZIP codes with the most families with kids in New Castle County, DE

These are the 23 ZIP codes in New Castle County with the highest share of households with children, out of 23 with at least 1,000 residents. 19938 (Clayton, 43.6%), 19709 (Middletown, 41.0%) and 19734 (Townsend, 40.1%) lead the list. There is no single "best" ZIP code in New Castle 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 New Castle County

Rank	ZIP	Mailing city	Households with children under 18	Residents	Households	Residential mailboxes
1	19938	Clayton	43.6%	9,561	3,159	3,561
2	19709	Middletown	41.0%	53,234	18,608	21,477
3	19734	Townsend	40.1%	14,214	4,534	5,064
4	19977	Smyrna	36.7%	27,704	9,322	11,076
5	19805	Wilmington	34.5%	41,402	15,722	16,115
6	19702	Newark	33.0%	55,683	21,252	21,813
7	19707	Hockessin	31.7%	17,376	6,448	6,591
8	19809	Wilmington	29.8%	14,311	6,121	6,605
9	19701	Bear	29.6%	42,984	16,599	16,507
10	19804	Wilmington	29.6%	18,779	7,677	7,432
11	19713	Newark	28.5%	30,747	12,526	13,188
12	19803	Wilmington	28.3%	22,279	8,679	8,959
13	19720	New Castle	28.1%	62,392	23,641	23,179
14	19810	Wilmington	27.5%	26,530	10,655	10,813
15	19808	Wilmington	27.3%	39,082	15,544	16,695
16	19706	Delaware City	25.9%	2,038	758	—
17	19802	Wilmington	23.9%	26,051	10,478	10,665
18	19807	Wilmington	22.2%	7,815	3,555	3,831
19	19801	Wilmington	21.7%	16,327	8,150	9,442
20	19703	Claymont	21.7%	15,460	6,974	7,192
21	19711	Newark	21.6%	49,432	18,815	21,334
22	21912	Warwick	9.9%	1,536	696	466
23	19806	Wilmington	7.7%	9,777	6,033	6,349

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; 23 of 32 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 51,345 households, on 87 carrier routes with 57,293 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 19938 on the EDDM route map

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Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in New Castle County has the highest share of households with children?: 19938 (Clayton), at 43.6%, among 23 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.