91737 ZIP Code, Rancho Cucamonga, CA
91737 is a ZIP code in Rancho Cucamonga, California in San Bernardino County. It covers 10 square miles of land. The closest ZIP codes are 91701, 91739 and 91730. 22,958 people live here in 7,995 households. At about 2,275 people per square mile it has suburban density, and most homes are owner-occupied (71%). Median household income is $122,334, above the California median of $99,122.
Quick facts
- Mailing city: Rancho Cucamonga, CA
- County: San Bernardino County
- Land area: 10 sq mi
- Population: 22,958
- Median household income: $122,334
- Carrier routes: 13 (8,534 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 22,958 |
| Households | 7,995 |
| Median household income | $122,334 |
| Income per person | $58,193 |
| Median age | 44.8 |
| Homeowners | 71.1% |
| Median home value | $878,400 |
| Median rent | $2,371 |
| Bachelor's degree or higher | 41.4% |
| Average commute (minutes) | 31.6 |
| Households with kids under 18 | 30.0% |
| Moved in the past year | 7.0% |
| Below the poverty line | 8.6% |
| Broadband internet | 95.1% |
| Speak a non-English language at home | 25.5% |
Household income
| % of households | Value |
|---|---|
| <$10K | 3.1% |
| $10–15K | 1.0% |
| $15–25K | 6.1% |
| $25–35K | 2.0% |
| $35–50K | 5.9% |
| $50–75K | 8.4% |
| $75–100K | 11.7% |
| $100–150K | 22.0% |
| $150–200K | 14.9% |
| $200K+ | 24.9% |
Age
| % of all residents | Value |
|---|---|
| <10 | 8.9% |
| 10–19 | 13.9% |
| 20–24 | 6.1% |
| 25–34 | 10.1% |
| 35–44 | 11.2% |
| 45–54 | 15.1% |
| 55–64 | 14.9% |
| 65–74 | 11.4% |
| 75+ | 8.3% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 48.2% |
| Owned outright | 20.2% |
| Rented | 27.5% |
| Vacant | 4.1% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 76.0% |
| Townhome | 1.7% |
| 2–4 units | 6.5% |
| 5–19 units | 4.4% |
| 20+ units | 10.9% |
| Mobile / other | 0.4% |
Businesses in 91737
393 business establishments with 3,913 employees (ZIP Codes Business Patterns 2023).
- Health Care and Social Assistance: 60
- Construction: 54
- Professional, Scientific, and Technical Services: 41
- Transportation and Warehousing: 33
- Other Services (except Public Administration): 30
- Retail Trade: 27
- Administrative and Support and Waste Management and Remediation Services: 27
- Accommodation and Food Services: 27
EDDM carrier routes
91737 has 13 USPS carrier routes with 8,534 residential and 116 business mailboxes. Open the EDDM route map.
Carrier routes in 91737
91737 has 13 USPS carrier routes (13 rural (R)) with 8,534 residential and 116 business mailboxes. Routes range from 453 homes (R048) to 865 homes (R096); the median route has 644 homes. The Census counted 7,995 households in 91737 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 2 |
| 500–749 | 7 |
| 750–999 | 4 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 91737 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route R048 — USPS business mailboxes 32, 453 homes
- Route R090 — USPS business mailboxes 29, 701 homes
- Route R049 — USPS business mailboxes 26, 538 homes
- Route R045 — USPS business mailboxes 9, 789 homes
- Route R094 — USPS business mailboxes 5, 491 homes
Select these 5 routes on the route map
Every carrier route in 91737
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| R043 | Rural | 667 | 1 | $165,484 | — | — | — |
| R044 | Rural | 644 | 2 | $155,427 | — | — | — |
| R045 | Rural | 789 | 9 | $156,487 | — | — | — |
| R046 | Rural | 539 | 0 | $155,427 | — | — | — |
| R047 | Rural | 610 | 3 | $200,001+ | — | — | — |
| R048 | Rural | 453 | 32 | $85,276 | — | — | — |
| R049 | Rural | 538 | 26 | $160,103 | — | — | — |
| R090 | Rural | 701 | 29 | $83,571 | — | — | — |
| R091 | Rural | 612 | 0 | $156,487 | — | — | — |
| R092 | Rural | 791 | 2 | $155,427 | — | — | — |
| R094 | Rural | 491 | 5 | $165,484 | — | — | — |
| R095 | Rural | 834 | 3 | $156,487 | — | — | — |
| R096 | Rural | 865 | 4 | $85,411 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 91737 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
- 91701 — Rancho Cucamonga city, CA (1.7 mi)
- 91739 — Rancho Cucamonga city, CA (3.5 mi)
- 91730 — Rancho Cucamonga city, CA (3.8 mi)
- 91784 — Upland city, CA (4.5 mi)
- 91764 — Ontario city, CA (5.8 mi)
- 91786 — Upland city, CA (5.9 mi)
- 92358 — Lytle Creek CDP, CA (6.3 mi)
- 92336 — Fontana city, CA (6.9 mi)
Areas that include 91737
- Rancho Cucamonga, CA ZIP codes — 4 ZIP codes
- San Bernardino County ZIP codes — 95 ZIP codes
- California ZIP code data
Where it ranks
- No. 5 of 69: highest median household income in San Bernardino County
- No. 3 of 68: highest median home value in San Bernardino County
- No. 13 of 71: highest median age in San Bernardino County
Mail every home in 91737
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) 91737, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 91737 in?
- 91737 is a Rancho Cucamonga, CA mailing address. By land area, 63% lies inside Rancho Cucamonga; the rest is outside any Census-defined city or community.
- What county is 91737 in?
- 91737 is in San Bernardino County.
- What is the population of 91737?
- About 22,958 people (±1,321), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 24,568.
- What is the median household income in 91737?
- $122,334 (±$9,418), 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 91737?
- 13 USPS carrier routes with 8,534 residential and 116 business mailboxes (8,650 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 91737?
- The closest, measured center to center: 91701 (1.7 mi, Rancho Cucamonga), 91739 (3.5 mi, Rancho Cucamonga), 91730 (3.8 mi, Rancho Cucamonga), 91784 (4.5 mi, Upland), 91764 (5.8 mi, Ontario) and 91786 (5.9 mi, Upland).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.