91321 ZIP Code, Newhall, CA
91321 is a ZIP code in Newhall, California in Los Angeles County. It covers 27 square miles of land. The closest ZIP codes are 91350, 91351 and 91344. 31,989 people live here in 10,863 households. At about 1,200 people per square mile it has suburban density, and owners and renters are mixed (61% own). Median household income is $91,092, close to the California median of $99,122.
Quick facts
- Mailing city: Newhall, CA
- County: Los Angeles County
- Land area: 27 sq mi
- Population: 31,989
- Median household income: $91,092
- Carrier routes: 19 (11,508 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 31,989 |
| Households | 10,863 |
| Median household income | $91,092 |
| Income per person | $41,866 |
| Median age | 36.5 |
| Homeowners | 60.8% |
| Median home value | $691,600 |
| Median rent | $2,134 |
| Bachelor's degree or higher | 32.4% |
| Average commute (minutes) | 30.5 |
| Households with kids under 18 | 34.9% |
| Moved in the past year | 8.4% |
| Below the poverty line | 9.6% |
| Broadband internet | 95.5% |
| Speak a non-English language at home | 47.2% |
Household income
| % of households | Value |
|---|---|
| <$10K | 3.1% |
| $10–15K | 2.7% |
| $15–25K | 4.1% |
| $25–35K | 6.9% |
| $35–50K | 9.7% |
| $50–75K | 14.3% |
| $75–100K | 14.3% |
| $100–150K | 15.4% |
| $150–200K | 12.0% |
| $200K+ | 17.6% |
Age
| % of all residents | Value |
|---|---|
| <10 | 12.9% |
| 10–19 | 15.0% |
| 20–24 | 6.4% |
| 25–34 | 13.7% |
| 35–44 | 13.7% |
| 45–54 | 12.2% |
| 55–64 | 10.8% |
| 65–74 | 8.0% |
| 75+ | 7.4% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 39.2% |
| Owned outright | 19.2% |
| Rented | 37.4% |
| Vacant | 4.2% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 41.5% |
| Townhome | 15.1% |
| 2–4 units | 10.6% |
| 5–19 units | 13.3% |
| 20+ units | 14.7% |
| Mobile / other | 4.8% |
Businesses in 91321
882 business establishments with 9,863 employees (ZIP Codes Business Patterns 2023).
- Health Care and Social Assistance: 157
- Accommodation and Food Services: 95
- Professional, Scientific, and Technical Services: 94
- Other Services (except Public Administration): 91
- Retail Trade: 87
- Construction: 81
- Administrative and Support and Waste Management and Remediation Services: 65
- Real Estate and Rental and Leasing: 47
EDDM carrier routes
91321 has 19 USPS carrier routes with 11,508 residential and 1,023 business mailboxes. Open the EDDM route map.
Carrier routes in 91321
91321 has 19 USPS carrier routes (18 city (C), 1 rural (R)) with 11,508 residential and 1,023 business mailboxes. Routes range from 213 homes (C021) to 999 homes (C020); the median route has 601 homes. The Census counted 10,863 households in 91321 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 1 |
| 250–499 | 5 |
| 500–749 | 7 |
| 750–999 | 6 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 91321 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C023 — USPS business mailboxes 390, 290 homes
- Route C015 — USPS business mailboxes 160, 601 homes
- Route C003 — USPS business mailboxes 122, 488 homes
- Route C019 — USPS business mailboxes 90, 917 homes
- Route C007 — USPS business mailboxes 75, 693 homes
Select these 5 routes on the route map
Every carrier route in 91321
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C001 | City | 680 | 21 | $127,531 | — | — | — |
| C002 | City | 644 | 43 | $113,839 | — | — | — |
| C003 | City | 488 | 122 | $50,000 | — | — | — |
| C004 | City | 491 | 1 | $103,456 | — | — | — |
| C006 | City | 527 | 0 | $66,075 | — | — | — |
| C007 | City | 693 | 75 | $96,675 | — | — | — |
| C008 | City | 771 | 37 | $127,531 | — | — | — |
| C009 | City | 576 | 0 | $113,839 | — | — | — |
| C010 | City | 872 | 4 | $104,441 | — | — | — |
| C011 | City | 779 | 1 | $101,193 | — | — | — |
| C013 | City | 759 | 11 | $50,000 | — | — | — |
| C014 | City | 399 | 50 | $87,664 | — | — | — |
| C015 | City | 601 | 160 | $103,456 | — | — | — |
| C018 | City | 558 | 1 | $124,018 | — | — | — |
| C019 | City | 917 | 90 | $50,536 | — | — | — |
| C020 | City | 999 | 3 | $87,664 | — | — | — |
| C021 | City | 213 | 11 | $200,001+ | — | — | — |
| C023 | City | 290 | 390 | $124,018 | — | — | — |
| R035 | Rural | 251 | 3 | $127,531 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 91321 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
- 91350 — Santa Clarita city, CA (4.7 mi)
- 91351 — Santa Clarita city, CA (5.1 mi)
- 91344 — Los Angeles city, CA (5.2 mi)
- 91355 — Santa Clarita city, CA (5.4 mi)
- 91340 — San Fernando city, CA (6.1 mi)
- 91342 — Los Angeles city, CA (6.5 mi)
- 91326 — Los Angeles city, CA (6.9 mi)
- 91381 — Stevenson Ranch CDP, CA (6.9 mi)
Areas that include 91321
- Santa Clarita, CA ZIP codes — 7 ZIP codes
- Newhall, CA ZIP codes — 1 ZIP code
- Los Angeles County ZIP codes — 298 ZIP codes
- California ZIP code data
Mail every home in 91321
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) 91321, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 91321 in?
- 91321 is a Newhall, CA mailing address. By land area, 51% lies inside Santa Clarita; the rest is outside any Census-defined city or community.
- What county is 91321 in?
- 91321 is in Los Angeles County.
- What is the population of 91321?
- About 31,989 people (±2,000), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 33,560.
- What is the median household income in 91321?
- $91,092 (±$8,880), 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 91321?
- 19 USPS carrier routes with 11,508 residential and 1,023 business mailboxes (12,531 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 91321?
- The closest, measured center to center: 91350 (4.7 mi, Santa Clarita), 91351 (5.1 mi, Santa Clarita), 91344 (5.2 mi, Los Angeles), 91355 (5.4 mi, Santa Clarita), 91340 (6.1 mi, San Fernando) and 91342 (6.5 mi, Los Angeles).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.