San Mateo, CA ZIP Codes
4 ZIP codes serve San Mateo, California: 94403, 94404, 94401 and 94402. Together they are home to 139,927 residents in 54,282 households. That is more than the 103,105 people counted inside San Mateo city limits, because these ZIP codes reach past its boundary. Median household income ranges from $122,227 in 94401 to $192,332 in 94404.
San Mateo city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 103,105 |
| Households | 39,895 |
| Median household income | $153,504 |
| Median home value | $1,618,700 |
| Median age | 38.3 |
| Median rent | $3,077 |
All 4 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 139,927 |
| Households (sum of ZIP codes) | 54,282 |
| Median household income, range across ZIP codes | $122,227 (94401) to $192,332 (94404) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $166,548 |
| Homeowners | 51.1% |
| Households with kids under 18 | 29.6% |
| Moved in the past year | 16.0% |
| Carrier routes in EDDM2GO's route library | 107 routes, 58,231 homes (4 of 4 ZIP codes) |
Top facts
- Highest median household income in San Mateo: 94404 ($192,332)
- Most residents: 94403 (43,276 people)
- Highest homeownership: 94402 (58.4% own their home)
- Most households with kids: 94404 (32.6% of households)
- Most new movers: 94403 (18.6% moved in last year)
- Youngest median age: 94401 (35.9 years)
- Highest median home value: 94402 ($2,000,000+)
Every ZIP code in San Mateo
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 94403 | San Mateo | 43,276 | 16,414 | $174,917 | $1,746,300 | 52.5% | 28.8% | 18.6% | 32 | 19,297 | 97% of its land; mailing city |
| 94404 | San Mateo | 35,881 | 14,717 | $192,332 | $1,714,400 | 51.2% | 32.6% | 17.8% | 26 | 16,134 | 13% of its land; mailing city |
| 94401 | San Mateo | 35,295 | 13,026 | $122,227 | $1,184,500 | 43.4% | 26.9% | 12.8% | 23 | 15,076 | 100% of its land; mailing city |
| 94402 | San Mateo | 25,475 | 10,125 | $172,522 | $2,000,000+ | 58.4% | 29.8% | 13.4% | 26 | 11,700 | 60% of its land; mailing city |
A ZIP code is listed for San Mateo when at least 10% of its land lies inside San Mateo city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is San Mateo. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside San Mateo.
Counties
- San Mateo County — 31 ZIP codes
Nearby cities sharing these ZIP codes
- Foster City — 1 ZIP code
Price a mailing to San Mateo ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in San Mateo, CA?
- 94403, 94404, 94401 and 94402. A ZIP code is listed for San Mateo when at least 10% of its land lies inside San Mateo city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is San Mateo.
- What is the population of San Mateo, CA?
- The Census Bureau counts 103,105 residents inside San Mateo city limits (ACS 2020–2024). The 4 ZIP codes that serve San Mateo hold 139,927 residents in all.
- What is the median household income in San Mateo, CA?
- $153,504 inside San Mateo city limits, per the Census Bureau. Across its ZIP codes the medians run from $122,227 to $192,332.
- Which San Mateo ZIP code has the highest median household income?
- 94404, at $192,332, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in San Mateo, CA?
- For the 4 of 4 ZIP codes in EDDM2GO's stored route library: 107 carrier routes reaching 58,231 residential and 3,970 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.