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

80135 (Sedalia), at 54.9 (±3.7), among 14 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 Douglas County, CO

These are the 14 ZIP codes in Douglas County with the highest median age, out of 14 with at least 1,000 residents. 80135 (Sedalia, 54.9), 80118 (Larkspur, 54.0) and 80116 (Franktown, 52.2) lead the list. There is no single "best" ZIP code in Douglas 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 Douglas County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	80135	Sedalia	54.9 ±3.7	4,141	1,679	1,442
2	80118	Larkspur	54.0 ±3.4	5,632	2,165	2,498
3	80116	Franktown	52.2 ±3.4	5,132	1,846	1,768
4	80126	Littleton	41.7 ±0.9	44,882	16,058	15,893
5	80129	Littleton	41.2 ±2.3	30,223	12,510	13,526
6	80130	Littleton	40.7 ±1.4	24,719	9,305	9,915
7	80125	Littleton	40.6 ±1.2	15,630	5,635	7,535
8	80108	Castle Rock	40.5 ±1.5	36,730	12,994	15,801
9	80138	Parker	40.2 ±1.6	36,895	12,447	13,298
10	80124	Lone Tree	38.7 ±1.8	22,555	9,948	10,582
11	80104	Castle Rock	38.2 ±1.2	38,479	14,383	16,114
12	80134	Parker	37.5 ±0.7	80,302	28,658	34,169
13	80109	Castle Rock	36.9 ±1.9	28,400	9,728	10,556
14	80112	Englewood	36.0 ±1.4	36,816	16,618	17,481

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; 14 of 15 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 34,258 households, on 52 carrier routes with 35,127 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 80135 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 Douglas County has the highest median age?: 80135 (Sedalia), at 54.9 (±3.7), among 14 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.