Which ZIP code in San Joaquin County has the highest median age?

95237 (Lockeford), at 42.6 (±2.7), among 29 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 San Joaquin County, CA

These are the 25 ZIP codes in San Joaquin County with the highest median age, out of 29 with at least 1,000 residents. 95237 (Lockeford, 42.6), 95258 (Woodbridge, 41.7) and 95242 (Lodi, 41.1) lead the list. There is no single "best" ZIP code in San Joaquin 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 San Joaquin County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	95237	Lockeford	42.6 ±2.7	3,639	1,529	1,018
2	95258	Woodbridge	41.7 ±10.3	4,144	1,622	1,462
3	95242	Lodi	41.1 ±2.1	28,427	10,691	12,124
4	95366	Ripon	40.9 ±2.6	18,954	6,736	5,801
5	95220	Acampo	40.0 ±3.5	7,931	2,609	2,441
6	95236	Linden	39.6 ±7.5	4,490	1,670	1,378
7	95212	Stockton	38.8 ±1.9	28,437	8,187	8,915
8	95632	Galt	38.4 ±1.4	32,493	10,275	10,941
9	95336	Manteca	38.2 ±1.4	50,185	16,200	17,151
10	95219	Stockton	37.4 ±2.2	31,713	11,517	12,387
11	95304	Tracy	37.3 ±3.1	15,841	4,949	4,998
12	95215	Stockton	36.9 ±1.7	24,847	6,580	7,339
13	95377	Tracy	36.7 ±1.4	37,739	10,170	12,874
14	95204	Stockton	36.7 ±2.4	31,035	11,405	11,744
15	95209	Stockton	36.4 ±1.2	47,409	13,759	13,956
16	95686	Thornton	36.1 ±6.5	1,171	395	—
17	95231	French Camp	35.5 ±3.6	3,896	538	800
18	95337	Manteca	35.3 ±1.8	48,731	14,079	16,792
19	95203	Stockton	35.2 ±2.6	15,930	5,392	5,783
20	95391	Tracy	35.1 ±1.6	25,574	7,097	9,181
21	95202	Stockton	35.1 ±4.8	7,066	3,380	3,593
22	95376	Tracy	34.7 ±1.3	54,488	16,981	17,306
23	95320	Escalon	34.7 ±3.0	13,500	4,662	4,528
24	95240	Lodi	34.1 ±1.1	50,517	16,064	16,933
25	95330	Lathrop	33.8 ±1.5	35,395	8,892	11,802

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; 29 of 33 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 23,187 households, on 41 carrier routes with 22,846 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 95237 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 San Joaquin County has the highest median age?: 95237 (Lockeford), at 42.6 (±2.7), among 29 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.