Which ZIP code in Johnston County has the highest median age?

28366 (Newton Grove), at 42.8 (±7.0), among 16 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.

Oldest ZIP codes in Johnston County, NC

These are the 16 ZIP codes in Johnston County with the highest median age, out of 16 with at least 1,000 residents. 28366 (Newton Grove, 42.8), 27577 (Smithfield, 41.3) and 27542 (Kenly, 40.8) lead the list. There is no single "best" ZIP code in Johnston County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Oldest ZIP codes in Johnston County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	28366	Newton Grove	42.8 ±7.0	3,769	1,602	2,123
2	27577	Smithfield	41.3 ±1.7	28,354	10,297	11,529
3	27542	Kenly	40.8 ±5.0	9,850	3,892	4,053
4	27557	Middlesex	40.7 ±3.4	8,657	2,992	3,978
5	27591	Wendell	40.1 ±2.9	29,838	10,751	13,824
6	27529	Garner	39.3 ±2.3	55,242	21,417	26,116
7	27568	Pine Level	39.2 ±8.2	1,542	542	—
8	27597	Zebulon	38.9 ±2.1	30,184	10,976	15,101
9	27592	Willow Spring	38.7 ±2.5	21,114	7,086	7,629
10	27504	Benson	38.7 ±3.0	17,079	6,980	8,794
11	27520	Clayton	37.6 ±1.3	48,014	17,819	21,803
12	27576	Selma	37.3 ±3.1	21,624	7,998	8,308
13	27569	Princeton	37.0 ±5.6	8,833	3,251	3,794
14	27501	Angier	36.9 ±1.5	24,806	9,023	11,200
15	27524	Four Oaks	36.4 ±3.7	13,999	5,089	6,034
16	27527	Clayton	35.7 ±2.0	39,256	13,846	16,382

How we ranked them

Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 16 of 18 qualify.

Which of these to mail, and why

Older ZIP codes respond to health care, hearing and vision, Medicare plans, home safety, estate planning and services that come to the door.

The top five ZIP codes on this list hold 29,534 households, on 47 carrier routes with 35,507 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 28366 on the EDDM route map

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Frequently asked questions

Which ZIP code in Johnston County has the highest median age?: 28366 (Newton Grove), at 42.8 (±7.0), among 16 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, highest 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.