94578 ZIP Code, San Leandro, CA
94578 is a ZIP code in San Leandro, California in Alameda County. It covers 4.6 square miles of land. The closest ZIP codes are 94580, 94579 and 94577. 41,769 people live here in 13,904 households. At about 9,162 people per square mile it is built up to city-neighborhood density, and owners and renters are mixed (44% own). Median household income is $94,084, close to the California median of $99,122.
Quick facts
- Mailing city: San Leandro, CA
- County: Alameda County
- Land area: 4.6 sq mi
- Population: 41,769
- Median household income: $94,084
- Carrier routes: 25 (14,614 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 41,769 |
| Households | 13,904 |
| Median household income | $94,084 |
| Income per person | $39,983 |
| Median age | 37.9 |
| Homeowners | 44.1% |
| Median home value | $823,000 |
| Median rent | $2,116 |
| Bachelor's degree or higher | 25.8% |
| Average commute (minutes) | 31.8 |
| Households with kids under 18 | 33.2% |
| Moved in the past year | 8.2% |
| Below the poverty line | 11.7% |
| Broadband internet | 94.8% |
| Speak a non-English language at home | 54.8% |
Household income
| % of households | Value |
|---|---|
| <$10K | 5.9% |
| $10–15K | 2.2% |
| $15–25K | 6.7% |
| $25–35K | 3.7% |
| $35–50K | 8.7% |
| $50–75K | 12.4% |
| $75–100K | 14.5% |
| $100–150K | 21.6% |
| $150–200K | 10.1% |
| $200K+ | 14.2% |
Age
| % of all residents | Value |
|---|---|
| <10 | 11.8% |
| 10–19 | 12.3% |
| 20–24 | 4.8% |
| 25–34 | 15.4% |
| 35–44 | 15.1% |
| 45–54 | 14.1% |
| 55–64 | 12.5% |
| 65–74 | 7.5% |
| 75+ | 6.5% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 27.7% |
| Owned outright | 14.3% |
| Rented | 52.8% |
| Vacant | 5.2% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 44.8% |
| Townhome | 11.0% |
| 2–4 units | 9.2% |
| 5–19 units | 9.9% |
| 20+ units | 23.8% |
| Mobile / other | 1.2% |
Businesses in 94578
606 business establishments with 10,428 employees (ZIP Codes Business Patterns 2023).
- Retail Trade: 111
- Health Care and Social Assistance: 107
- Other Services (except Public Administration): 76
- Accommodation and Food Services: 67
- Construction: 53
- Real Estate and Rental and Leasing: 41
- Professional, Scientific, and Technical Services: 31
- Transportation and Warehousing: 22
EDDM carrier routes
94578 has 25 USPS carrier routes with 14,614 residential and 783 business mailboxes. Open the EDDM route map.
Carrier routes in 94578
94578 has 25 USPS carrier routes (25 city (C)) with 14,614 residential and 783 business mailboxes. Routes range from 346 homes (C012) to 928 homes (C002); the median route has 561 homes. The Census counted 13,904 households in 94578 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 8 |
| 500–749 | 15 |
| 750–999 | 2 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 94578 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C041 — USPS business mailboxes 127, 561 homes
- Route C006 — USPS business mailboxes 89, 520 homes
- Route C028 — USPS business mailboxes 77, 654 homes
- Route C029 — USPS business mailboxes 75, 713 homes
- Route C011 — USPS business mailboxes 74, 616 homes
Select these 5 routes on the route map
Every carrier route in 94578
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C002 | City | 928 | 22 | $43,743 | — | — | — |
| C006 | City | 520 | 89 | $60,290 | — | — | — |
| C008 | City | 632 | 43 | $61,824 | — | — | — |
| C010 | City | 630 | 11 | $129,989 | — | — | — |
| C011 | City | 616 | 74 | $72,721 | — | — | — |
| C012 | City | 346 | 1 | $113,419 | — | — | — |
| C013 | City | 516 | 24 | $43,743 | — | — | — |
| C016 | City | 718 | 32 | $43,743 | — | — | — |
| C017 | City | 493 | 1 | $97,443 | — | — | — |
| C020 | City | 429 | 58 | $38,355 | — | — | — |
| C021 | City | 691 | 30 | $129,989 | — | — | — |
| C022 | City | 604 | 4 | $106,799 | — | — | — |
| C023 | City | 494 | 0 | $94,486 | — | — | — |
| C024 | City | 728 | 2 | $97,443 | — | — | — |
| C025 | City | 638 | 0 | $52,107 | — | — | — |
| C026 | City | 428 | 44 | $141,370 | — | — | — |
| C027 | City | 441 | 1 | $106,799 | — | — | — |
| C028 | City | 654 | 77 | $107,213 | — | — | — |
| C029 | City | 713 | 75 | $97,443 | — | — | — |
| C030 | City | 472 | 9 | $97,443 | — | — | — |
| C031 | City | 353 | 28 | $88,745 | — | — | — |
| C032 | City | 552 | 6 | $60,290 | — | — | — |
| C033 | City | 919 | 5 | $51,199 | — | — | — |
| C036 | City | 538 | 20 | $129,989 | — | — | — |
| C041 | City | 561 | 127 | $141,370 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 94578 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
- 94580 — San Lorenzo CDP, CA (2 mi)
- 94579 — San Leandro city, CA (2.2 mi)
- 94577 — San Leandro city, CA (2.5 mi)
- 94546 — Castro Valley CDP, CA (2.9 mi)
- 94541 — Hayward city, CA (3.1 mi)
- 94603 — Oakland city, CA (3.5 mi)
- 94605 — Oakland city, CA (4 mi)
- 94545 — Hayward city, CA (5.3 mi)
Areas that include 94578
- San Leandro, CA ZIP codes — 3 ZIP codes
- Castro Valley, CA ZIP codes — 3 ZIP codes
- Ashland, CA ZIP codes — 3 ZIP codes
- Alameda County ZIP codes — 52 ZIP codes
- California ZIP code data
Mail every home in 94578
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) 94578, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 94578 in?
- 94578 is a San Leandro, CA mailing address. By land area, 46% lies inside San Leandro, 37% lies inside Castro Valley and 17% lies inside Ashland.
- What county is 94578 in?
- 94578 is in Alameda County.
- What is the population of 94578?
- About 41,769 people (±2,262), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 40,957.
- What is the median household income in 94578?
- $94,084 (±$7,600), compared with $99,122 for California as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 94578?
- 25 USPS carrier routes with 14,614 residential and 783 business mailboxes (15,397 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 94578?
- The closest, measured center to center: 94580 (2 mi, San Lorenzo), 94579 (2.2 mi, San Leandro), 94577 (2.5 mi, San Leandro), 94546 (2.9 mi, Castro Valley), 94541 (3.1 mi, Hayward) and 94603 (3.5 mi, Oakland).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.