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

80121 (Littleton), at 47.8 (±3.1), among 26 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 Arapahoe County, CO

These are the 25 ZIP codes in Arapahoe County with the highest median age, out of 26 with at least 1,000 residents. 80121 (Littleton, 47.8), 80105 (Deer Trail, 45.8) and 80111 (Englewood, 42.7) lead the list. There is no single "best" ZIP code in Arapahoe 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 Arapahoe County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	80121	Littleton	47.8 ±3.1	18,029	7,270	7,408
2	80105	Deer Trail	45.8 ±14.1	2,182	836	616
3	80111	Englewood	42.7 ±1.0	31,561	13,209	14,098
4	80120	Littleton	42.5 ±1.9	29,725	13,377	13,489
5	80122	Littleton	42.3 ±1.2	32,195	12,969	13,151
6	80123	Littleton	41.8 ±1.3	44,549	19,270	19,726
7	80014	Aurora	40.9 ±1.9	39,496	18,760	20,221
8	80016	Aurora	39.9 ±0.8	68,268	23,982	26,719
9	80113	Englewood	39.6 ±1.6	22,976	11,077	11,031
10	80015	Aurora	39.5 ±1.0	72,316	25,239	25,591
11	80222	Denver	37.9 ±2.0	23,838	11,458	11,987
12	80102	Bennett	37.5 ±2.0	6,690	2,250	2,805
13	80110	Englewood	36.7 ±1.3	23,825	10,306	10,957
14	80137	Watkins	36.7 ±10.4	1,689	561	835
15	80013	Aurora	36.6 ±0.8	73,248	25,720	26,345
16	80112	Englewood	36.0 ±1.4	36,816	16,618	17,481
17	80247	Denver	34.9 ±1.8	29,760	14,919	15,575
18	80136	Strasburg	34.4 ±3.4	6,144	1,993	2,424
19	80018	Aurora	34.3 ±0.9	19,072	6,193	9,217
20	80012	Aurora	34.0 ±0.9	51,052	19,536	19,427
21	80231	Denver	33.3 ±1.2	35,883	16,395	17,774
22	80017	Aurora	32.9 ±1.3	40,584	14,162	14,459
23	80246	Denver	32.5 ±1.9	13,097	7,666	7,863
24	80011	Aurora	32.0 ±1.4	53,695	18,545	20,024
25	80010	Aurora	32.0 ±2.1	42,439	14,357	15,419

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; 26 of 26 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 47,661 households, on 107 carrier routes with 48,762 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 80121 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

Map it and price it

EDDM guides

Frequently asked questions

Which ZIP code in Arapahoe County has the highest median age?: 80121 (Littleton), at 47.8 (±3.1), among 26 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.