63304 ZIP Code, Saint Charles, MO
63304 is a ZIP code in Saint Charles, Missouri in St. Charles County. It covers 55 square miles of land. The closest ZIP codes are 63368, 63005 and 63341. 43,195 people live here in 16,284 households, more than in 9 of every 10 Missouri ZIP codes. With about 784 people per square mile it is lightly settled, and most homes are owner-occupied (88%). Median household income is $114,442, well above the Missouri median of $70,702.
Quick facts
- Mailing city: Saint Charles, MO
- County: St. Charles County
- Land area: 55 sq mi
- Population: 43,195
- Median household income: $114,442
- Carrier routes: 29 (17,988 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 43,195 |
| Households | 16,284 |
| Median household income | $114,442 |
| Income per person | $60,115 |
| Median age | 40.7 |
| Homeowners | 87.7% |
| Median home value | $351,000 |
| Median rent | $1,749 |
| Bachelor's degree or higher | 49.3% |
| Average commute (minutes) | 24.4 |
| Households with kids under 18 | 33.8% |
| Moved in the past year | 8.1% |
| Below the poverty line | 3.5% |
| Broadband internet | 95.4% |
| Speak a non-English language at home | 4.6% |
Household income
| % of households | Value |
|---|---|
| <$10K | 1.3% |
| $10–15K | 0.5% |
| $15–25K | 2.8% |
| $25–35K | 2.9% |
| $35–50K | 5.4% |
| $50–75K | 13.6% |
| $75–100K | 15.4% |
| $100–150K | 22.2% |
| $150–200K | 14.5% |
| $200K+ | 21.4% |
Age
| % of all residents | Value |
|---|---|
| <10 | 11.5% |
| 10–19 | 14.0% |
| 20–24 | 5.1% |
| 25–34 | 11.1% |
| 35–44 | 13.9% |
| 45–54 | 12.6% |
| 55–64 | 13.4% |
| 65–74 | 11.3% |
| 75+ | 7.2% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 59.3% |
| Owned outright | 26.4% |
| Rented | 11.9% |
| Vacant | 2.4% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 83.7% |
| Townhome | 5.4% |
| 2–4 units | 1.6% |
| 5–19 units | 4.4% |
| 20+ units | 4.6% |
| Mobile / other | 0.3% |
Businesses in 63304
958 business establishments with 12,151 employees (ZIP Codes Business Patterns 2023).
- Construction: 127
- Other Services (except Public Administration): 114
- Health Care and Social Assistance: 101
- Professional, Scientific, and Technical Services: 87
- Accommodation and Food Services: 87
- Retail Trade: 84
- Administrative and Support and Waste Management and Remediation Services: 79
- Finance and Insurance: 68
EDDM carrier routes
63304 has 29 USPS carrier routes with 17,988 residential and 945 business mailboxes. Open the EDDM route map.
Carrier routes in 63304
63304 has 29 USPS carrier routes (5 city (C), 24 rural (R)) with 17,988 residential and 945 business mailboxes. Routes range from 316 homes (R037) to 973 homes (R002); the median route has 613 homes. The Census counted 16,284 households in 63304 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 4 |
| 500–749 | 21 |
| 750–999 | 4 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 63304 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C038 — USPS business mailboxes 146, 874 homes
- Route R036 — USPS business mailboxes 127, 675 homes
- Route R012 — USPS business mailboxes 117, 524 homes
- Route R027 — USPS business mailboxes 117, 512 homes
- Route C055 — USPS business mailboxes 87, 587 homes
Select these 5 routes on the route map
Every carrier route in 63304
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C016 | City | 714 | 10 | $111,202 | — | — | — |
| C020 | City | 588 | 36 | $80,677 | — | — | — |
| C038 | City | 874 | 146 | $56,227 | — | — | — |
| C048 | City | 562 | 69 | $93,956 | — | — | — |
| C055 | City | 587 | 87 | $93,358 | — | — | — |
| R002 | Rural | 973 | 22 | $102,956 | — | — | — |
| R004 | Rural | 581 | 3 | $150,654 | — | — | — |
| R005 | Rural | 793 | 0 | $162,595 | — | — | — |
| R006 | Rural | 372 | 34 | — | — | — | — |
| R008 | Rural | 766 | 0 | $104,278 | — | — | — |
| R009 | Rural | 643 | 86 | $173,340 | — | — | — |
| R010 | Rural | 738 | 0 | $150,654 | — | — | — |
| R012 | Rural | 524 | 117 | $120,739 | — | — | — |
| R013 | Rural | 613 | 2 | $131,838 | — | — | — |
| R014 | Rural | 682 | 20 | $102,595 | — | — | — |
| R016 | Rural | 732 | 6 | $90,350 | — | — | — |
| R017 | Rural | 449 | 3 | $173,340 | — | — | — |
| R018 | Rural | 574 | 5 | $138,562 | — | — | — |
| R020 | Rural | 517 | 3 | $173,404 | — | — | — |
| R022 | Rural | 557 | 22 | $152,998 | — | — | — |
| R023 | Rural | 418 | 1 | $173,340 | — | — | — |
| R025 | Rural | 694 | 0 | $56,227 | — | — | — |
| R027 | Rural | 512 | 117 | $102,956 | — | — | — |
| R028 | Rural | 548 | 0 | $119,042 | — | — | — |
| R029 | Rural | 672 | 0 | $138,562 | — | — | — |
| R031 | Rural | 633 | 1 | $150,654 | — | — | — |
| R033 | Rural | 681 | 25 | $93,358 | — | — | — |
| R036 | Rural | 675 | 127 | $138,562 | — | — | — |
| R037 | Rural | 316 | 3 | $131,838 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 63304 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
- 63368 — O'Fallon city, MO (3.9 mi)
- 63005 — Wildwood city, MO (4.7 mi)
- 63341 — Defiance CDP, MO (7.2 mi)
- 63367 — Lake St. Louis city, MO (7.5 mi)
- 63376 — St. Peters city, MO (7.7 mi)
- 63303 — St. Charles city, MO (8 mi)
- 63017 — Chesterfield city, MO (8.5 mi)
- 63038 — Wildwood city, MO (9 mi)
Areas that include 63304
- St. Peters, MO ZIP codes — 2 ZIP codes
- Cottleville, MO ZIP codes — 2 ZIP codes
- Weldon Spring, MO ZIP codes — 1 ZIP code
- Weldon Spring Heights, MO ZIP codes — 1 ZIP code
- Saint Charles, MO ZIP codes — 3 ZIP codes
- St. Charles County ZIP codes — 14 ZIP codes
- Missouri ZIP code data
Where it ranks
- No. 5 of 11: highest median home value in St. Charles County
- No. 4 of 11: highest share of owner-occupied homes in St. Charles County
Mail every home in 63304
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) 63304, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 63304 in?
- 63304 is a Saint Charles, MO mailing address. By land area, 14% lies inside Weldon Spring, 6% lies inside Cottleville, 4% lies inside St. Peters and 1% lies inside O'Fallon; the rest is outside any Census-defined city or community.
- What county is 63304 in?
- 63304 is in St. Charles County.
- What is the population of 63304?
- About 43,195 people (±1,613), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 42,028.
- What is the median household income in 63304?
- $114,442 (±$5,041), compared with $70,702 for Missouri as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 63304?
- 29 USPS carrier routes with 17,988 residential and 945 business mailboxes (18,934 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 63304?
- The closest, measured center to center: 63368 (3.9 mi, O'Fallon), 63005 (4.7 mi, Wildwood), 63341 (7.2 mi, Defiance), 63367 (7.5 mi, Lake St. Louis), 63376 (7.7 mi, St. Peters) and 63303 (8 mi, St. Charles).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.