Which ZIP code in Douglas County has the highest share of households with children?

80109 (Castle Rock), at 45.4%, 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.

ZIP codes with the most families with kids in Douglas County, CO

These are the 14 ZIP codes in Douglas County with the highest share of households with children, out of 14 with at least 1,000 residents. 80109 (Castle Rock, 45.4%), 80108 (Castle Rock, 41.4%) and 80126 (Littleton, 40.6%) 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.

ZIP codes with the most families with kids in Douglas County

Rank	ZIP	Mailing city	Households with children under 18	Residents	Households	Residential mailboxes
1	80109	Castle Rock	45.4%	28,400	9,728	10,556
2	80108	Castle Rock	41.4%	36,730	12,994	15,801
3	80126	Littleton	40.6%	44,882	16,058	15,893
4	80130	Littleton	40.0%	24,719	9,305	9,915
5	80138	Parker	39.3%	36,895	12,447	13,298
6	80125	Littleton	38.6%	15,630	5,635	7,535
7	80134	Parker	38.0%	80,302	28,658	34,169
8	80104	Castle Rock	36.2%	38,479	14,383	16,114
9	80116	Franktown	32.4%	5,132	1,846	1,768
10	80129	Littleton	29.9%	30,223	12,510	13,526
11	80112	Englewood	26.8%	36,816	16,618	17,481
12	80124	Lone Tree	24.8%	22,555	9,948	10,582
13	80118	Larkspur	22.8%	5,632	2,165	2,498
14	80135	Sedalia	18.6%	4,141	1,679	1,442

How we ranked them

Ranked by the share of households with one or more people under 18 (ACS Data Profile, 2020–2024). The Census Bureau does not publish a margin of error for this share in our files. ZIP codes need at least 1,000 residents to be ranked; 14 of 15 qualify.

Which of these to mail, and why

Households with children buy tutoring, youth sports, pediatric and family dental care, child care, birthday venues and family dining. EDDM reaches every door on a route, so a higher share means more of your pieces land with families.

The top five ZIP codes on this list hold 60,532 households, on 96 carrier routes with 65,463 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 80109 on the EDDM route map

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Frequently asked questions

Which ZIP code in Douglas County has the highest share of households with children?: 80109 (Castle Rock), at 45.4%, among 14 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the share of households with one or more people under 18 (ACS Data Profile, 2020–2024). The Census Bureau does not publish a margin of error for this share in our files.
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.