| Primary address | 21320 Oak Street, Castro Valley |
| Alternate address(es) | 21338 Oak St |
| Zip code | 94546 |
| County | Alameda |
| Parcel ID | 415-160-53 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Property tax | $0 |
| Building class | Exempt Public Agency (0300) |
| Acreage | 0.34 |
| Zoning district | Multiple Residential (R4) |
| School district | Hayward Unif SCH |
View more neighborhood information such as transportation, nearby schools and risk designations in the dedicated tab.
Property reports include comprehensive occupancy, improvement and development information (where available).
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Create a free account to view the complete sales history for 21320 Oak Street, Castro Valley, including title documents, transfer conditions, mortgages and liens.
Access detailed property tax data for 21320 Oak Street, Castro Valley, CA 94546. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year: | 2025-2026 |
| Property tax | $0 |
| Market value | $0 |
The complete history of permits filed for 21320 Oak Street, Castro Valley, including new construction or demolition permits, plus any work pertaining to plumbing, heating and sprinkler systems is available with a free account. Available data goes back to 1990.
Access a detailed real estate market overview of Castro Valley so you can assess current trends, home values, types of properties sold and transaction volume. View the median home sale price in Castro Valley and compare it to other neighborhoods in Alameda County.
Check out recently sold homes in Castro-Valley and see how their prices compare.
Create a free account to unlock extended information for 21320 Oak Street, Castro Valley, including whether it's located in FEMA flood zones, floodways or special flood hazard areas, as well as the Coastal barriers resources system area (COBRA).
| FEMA flood zone(s) | X (See more on map) |
| Fire hazard zone | See more on map |
| Faults and tsunami inundation zone map | Register |
| Landslides and liquefaction map | Register |
Access the detailed traffic volume map for 21320 Oak Street, Castro Valley to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.
| View daily traffic map |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Strobridge Elementary School | NR | Public | K-6 | 362 | 0.19 |
| Crossroads Christian Elementary School | NR | Private | K-6 | 0 | 0.45 |
| Liber Community School | NR | Private | 4-12 | 0 | 0.52 |
| The Montessori Giving Tree | NR | Private | K-6 | 12 | 0.53 |
| Harder Elementary School | 3 | Public | K-6 | 675 | 0.80 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Liber Community School | NR | Private | 4-12 | 0 | 0.52 |
| Knowledge Enlightens You (Key) Academy | 5 | Charter | K-8 | 614 | 0.80 |
| Hayward Adult | NR | Public | 0 | 1.00 | |
| Our Lady Of Grace School | NR | Private | K-8 | 218 | 1.11 |
| Special Education-Preschool-Laurel | NR | Public | 1 | 1.13 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Liber Community School | NR | Private | 4-12 | 0 | 0.52 |
| Hayward Adult | NR | Public | 0 | 1.00 | |
| Brenkwitz High School | 2 | Public | 9-12 | 179 | 1.03 |
| Stellar Preparatory High School | NR | Private | 9-11 | 26 | 1.03 |
| Special Education-Preschool-Laurel | NR | Public | 1 | 1.13 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 21320 Oak Street, Castro Valley.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 4847 Roberts CT, Castro Valley | 2,865 | 03/29/2019 | $1,175,000 |
| 2069 Strobridge Ave, Castro Valley | 1,606 | 07/24/2019 | $779,000 |
| 4835 Roberts CT, Castro Valley | 3,073 | 07/29/2020 | |
| 2028 Vivian St, Castro Valley | 1,612 | ||
| 4843 Roberts CT, Castro Valley | 3,073 | 07/14/2020 | |
| 4851 Roberts CT, Castro Valley | 3,073 | 08/15/2025 | |
| 2079 Strobridge Ave, Castro Valley | 2,233 | 01/13/2021 | |
| 4839 Roberts CT, Castro Valley | 2,526 | 07/26/2023 | |
| 2020 Vivian St, Castro Valley | 1,540 | ||
| 4831 Roberts CT, Castro Valley | 2,526 | 11/07/2023 |