ZIP Code 91730 — Rancho Cucamonga city, CA Demographics & Data

ZIP code 91730 covers Rancho Cucamonga, CA in San Bernardino County with a population of about 71,692.

At a glance, the area shows median age of 34.8 versus a U.S. median of about 38.9.

It sits in telephone area codes 840, 909; U.S. House district CA-35; the LOS ANGELES media market.

Rancho Cucamonga, CA sits in a university / college context (near universal technical institute of california inc (1.3 mi)). Expect stronger interest in student housing, rentals, walkability, transit, and a younger adult age mix versus typical suburban ZIPs.

Median household income in ZIP 91730 is about $89,654 — about 19% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 10.1%; unemployment rate near 5.7%; 32.5% of adults with a bachelor’s degree or higher (about 1.2 points below the national share (33.7%)).

Labor and commute patterns include leading industry context around Healthcare, Retail trade, and Education; about 10.5% of workers reporting work-from-home (about 4.7 points below the U.S. share (15.2%)); a mean commute of about 180.0 minutes (U.S. average near 26.8).

Median home value is about $595,400 — about 71% above the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $2,052 (about 76% above the U.S. median rent ($1,163)), and owner-occupancy near 48.4% (about 17.0 points below the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 91730 in Rancho Cucamonga, CA, a household would need roughly $164,000 in annual income under a 20% down, 30-year loan at 6.8% (illustrative), keeping housing costs near 28% of income. Estimated monthly PITI is about $3,825. That is about 83% above the local median household income ($89,654), so the median earner would likely stretch or need a larger down payment. Rates, taxes, insurance, and HOA fees vary — treat this as a planning estimate, not a lender quote.

FEMA’s National Risk Index rates natural-hazard risk for Rancho Cucamonga city, CA as Very High (composite score 99.8), which is among the highest nationally. The strongest component scores on US5 are wildfire (99.9) and flood (99.8). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.

Climate normals for Rancho Cucamonga city, CA show little to no average snow and around 11.6 inches of annual precipitation.

IRS migration statistics show a net inflow of about 3,528 for ZIP 91730 (Rancho Cucamonga city, CA) on US5’s published series — a signal of people/tax filers moving in relative to those leaving. Inflows often track job growth, housing demand, or lifestyle migration; treat the figure as a directional indicator rather than a precise headcount.