80104 ZIP Code, Castle Rock, CO
80104 is a ZIP code in Castle Rock, Colorado in Douglas County. It covers 71 square miles of land. The closest ZIP codes are 80116, 80109 and 80118. 38,479 people live here in 14,383 households, more than in 9 of every 10 Colorado ZIP codes. With about 544 people per square mile it is lightly settled, and most homes are owner-occupied (79%). Median household income is $134,335, above the Colorado median of $95,470.
Quick facts
- Mailing city: Castle Rock, CO
- County: Douglas County
- Land area: 71 sq mi
- Population: 38,479
- Median household income: $134,335
- Carrier routes: 25 (16,114 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 38,479 |
| Households | 14,383 |
| Median household income | $134,335 |
| Income per person | $59,720 |
| Median age | 38.2 |
| Homeowners | 79.4% |
| Median home value | $624,200 |
| Median rent | $1,880 |
| Bachelor's degree or higher | 55.8% |
| Average commute (minutes) | 29.5 |
| Households with kids under 18 | 36.2% |
| Moved in the past year | 17.6% |
| Below the poverty line | 4.2% |
| Broadband internet | 96.5% |
| Speak a non-English language at home | 7.7% |
Household income
| % of households | Value |
|---|---|
| <$10K | 2.2% |
| $10–15K | 0.9% |
| $15–25K | 3.6% |
| $25–35K | 2.4% |
| $35–50K | 5.4% |
| $50–75K | 8.0% |
| $75–100K | 13.0% |
| $100–150K | 19.6% |
| $150–200K | 18.4% |
| $200K+ | 26.5% |
Age
| % of all residents | Value |
|---|---|
| <10 | 11.8% |
| 10–19 | 12.7% |
| 20–24 | 6.0% |
| 25–34 | 14.8% |
| 35–44 | 15.2% |
| 45–54 | 13.8% |
| 55–64 | 11.3% |
| 65–74 | 9.5% |
| 75+ | 4.8% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 62.8% |
| Owned outright | 14.0% |
| Rented | 19.9% |
| Vacant | 3.4% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 73.9% |
| Townhome | 7.6% |
| 2–4 units | 1.7% |
| 5–19 units | 9.0% |
| 20+ units | 7.3% |
| Mobile / other | 0.4% |
Businesses in 80104
1,153 business establishments with 9,236 employees (ZIP Codes Business Patterns 2023).
- Professional, Scientific, and Technical Services: 170
- Health Care and Social Assistance: 140
- Construction: 135
- Other Services (except Public Administration): 126
- Retail Trade: 98
- Real Estate and Rental and Leasing: 98
- Finance and Insurance: 92
- Administrative and Support and Waste Management and Remediation Services: 77
EDDM carrier routes
80104 has 25 USPS carrier routes with 16,114 residential and 744 business mailboxes. Open the EDDM route map.
Carrier routes in 80104
80104 has 25 USPS carrier routes (17 city (C), 8 highway contract (H)) with 16,114 residential and 744 business mailboxes. Routes range from 270 homes (C067) to 977 homes (C040); the median route has 673 homes. The Census counted 14,383 households in 80104 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 7 |
| 500–749 | 10 |
| 750–999 | 8 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 80104 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C001 — USPS business mailboxes 248, 451 homes
- Route C015 — USPS business mailboxes 197, 286 homes
- Route C038 — USPS business mailboxes 95, 440 homes
- Route C008 — USPS business mailboxes 72, 721 homes
- Route C009 — USPS business mailboxes 42, 617 homes
Select these 5 routes on the route map
Every carrier route in 80104
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C001 | City | 451 | 248 | $57,076 | — | — | — |
| C002 | City | 745 | 5 | $123,857 | — | — | — |
| C003 | City | 610 | 20 | $76,155 | — | — | — |
| C004 | City | 843 | 2 | $79,023 | — | — | — |
| C006 | City | 708 | 2 | $131,151 | — | — | — |
| C008 | City | 721 | 72 | $105,728 | — | — | — |
| C009 | City | 617 | 42 | $57,076 | — | — | — |
| C010 | City | 549 | 3 | $79,023 | — | — | — |
| C015 | City | 286 | 197 | $151,445 | — | — | — |
| C017 | City | 646 | 0 | $125,752 | — | — | — |
| C023 | City | 708 | 1 | $141,470 | — | — | — |
| C031 | City | 610 | 2 | $151,445 | — | — | — |
| C038 | City | 440 | 95 | $160,515 | — | — | — |
| C040 | City | 977 | 1 | $160,515 | — | — | — |
| C044 | City | 852 | 2 | $151,445 | — | — | — |
| C048 | City | 850 | 0 | $160,515 | — | — | — |
| C067 | City | 270 | 0 | $160,515 | — | — | — |
| H039 | Highway contract | 907 | 0 | $160,515 | — | — | — |
| H040 | Highway contract | 782 | 3 | $162,487 | — | — | — |
| H041 | Highway contract | 973 | 1 | $160,515 | — | — | — |
| H046 | Highway contract | 414 | 0 | $141,470 | — | — | — |
| H049 | Highway contract | 321 | 33 | $131,151 | — | — | — |
| H057 | Highway contract | 753 | 0 | $105,728 | — | — | — |
| H088 | Highway contract | 673 | 4 | $157,022 | — | — | — |
| H089 | Highway contract | 408 | 11 | $79,023 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 80104 on the EDDM route map.
How route demographics are estimated
Mailbox counts come from USPS; demographics are estimates
The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).
How a route gets its figures: the block-group length-share method
We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.
Margins of error
Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.
Different years
USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.
Why some routes show identical figures
Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.
Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Nearby ZIP codes
- 80116 — Franktown CDP, CO (6 mi)
- 80109 — Castle Rock town, CO (6.9 mi)
- 80118 — Perry Park CDP, CO (8.5 mi)
- 80108 — Castle Pines city, CO (10 mi)
- 80134 — Parker town, CO (12.7 mi)
- 80133 — Palmer Lake town, CO (13.7 mi)
- 80132 — Monument town, CO (15 mi)
- 80107 — Ponderosa Park CDP, CO (15.2 mi)
Areas that include 80104
- Castle Rock, CO ZIP codes — 3 ZIP codes
- Douglas County ZIP codes — 15 ZIP codes
- Colorado ZIP code data
Where it ranks
- No. 4 of 14: highest share of residents who moved in during the past year in Douglas County
- No. 4 of 14: lowest median age in Douglas County
- No. 3 of 14: fastest population growth in Douglas County
Mail every home in 80104
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 80104, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 80104 in?
- 80104 is a Castle Rock, CO mailing address. By land area, 19% lies inside Castle Rock; the rest is outside any Census-defined city or community.
- What county is 80104 in?
- 80104 is in Douglas County.
- What is the population of 80104?
- About 38,479 people (±1,839), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 34,727.
- What is the median household income in 80104?
- $134,335 (±$12,090), compared with $95,470 for Colorado as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 80104?
- 25 USPS carrier routes with 16,114 residential and 744 business mailboxes (16,859 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 80104?
- The closest, measured center to center: 80116 (6 mi, Franktown), 80109 (6.9 mi, Castle Rock), 80118 (8.5 mi, Perry Park), 80108 (10 mi, Castle Pines), 80134 (12.7 mi, Parker) and 80133 (13.7 mi, Palmer Lake).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.