Which ZIP code in New Castle County has the fastest population growth?

19717 (Newark), at 56.0%, among 24 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.

Fastest-growing ZIP codes in New Castle County, DE

These are the 24 ZIP codes in New Castle County with the fastest population growth, out of 24 with at least 1,000 residents. 19717 (Newark, 56.0%), 21912 (Warwick, 34.9%) and 19709 (Middletown, 25.3%) 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.

Fastest-growing ZIP codes in New Castle County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	19717	Newark	56.0%	6,036	0	32
2	21912	Warwick	34.9%	1,536	696	466
3	19709	Middletown	25.3%	53,234	18,608	21,477
4	19706	Delaware City	13.0%	2,038	758	—
5	19707	Hockessin	9.8%	17,376	6,448	6,591
6	19734	Townsend	8.4%	14,214	4,534	5,064
7	19938	Clayton	8.0%	9,561	3,159	3,561
8	19977	Smyrna	7.9%	27,704	9,322	11,076
9	19805	Wilmington	7.7%	41,402	15,722	16,115
10	19804	Wilmington	7.2%	18,779	7,677	7,432
11	19701	Bear	7.0%	42,984	16,599	16,507
12	19720	New Castle	4.6%	62,392	23,641	23,179
13	19807	Wilmington	4.0%	7,815	3,555	3,831
14	19810	Wilmington	2.1%	26,530	10,655	10,813
15	19803	Wilmington	1.9%	22,279	8,679	8,959
16	19713	Newark	1.6%	30,747	12,526	13,188
17	19802	Wilmington	1.3%	26,051	10,478	10,665
18	19808	Wilmington	1.1%	39,082	15,544	16,695
19	19703	Claymont	0.6%	15,460	6,974	7,192
20	19702	Newark	0.3%	55,683	21,252	21,813
21	19806	Wilmington	-1.1%	9,777	6,033	6,349
22	19801	Wilmington	-4.2%	16,327	8,150	9,442
23	19809	Wilmington	-5.5%	14,311	6,121	6,605
24	19711	Newark	-5.9%	49,432	18,815	21,334

How we ranked them

Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have at least 1,000 residents. ZIP codes need at least 1,000 residents to be ranked; 24 of 32 qualify.

Which of these to mail, and why

Growing ZIP codes add households every year, which means new homes, new routes and customers without a go-to provider yet. Check the route map: new subdivisions can appear as new carrier routes.

The top five ZIP codes on this list hold 26,510 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 19717 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 fastest population growth?: 19717 (Newark), at 56.0%, among 24 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have 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.

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.