ZIP Code 91739 — Rancho Cucamonga city, CA Demographics & Data

ZIP code 91739 covers Rancho Cucamonga, CA in San Bernardino County with a population of about 41,722.

At a glance, the area shows median age of 37.2 versus a U.S. median of about 38.9.

It sits in telephone area codes 840, 909; U.S. House district CA-28; the LOS ANGELES media market.

Median household income in ZIP 91739 is about $141,475 — about 88% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 6.1%; unemployment rate near 5.3%; 44.9% of adults with a bachelor’s degree or higher (about 11.2 points above the national share (33.7%)).

Labor and commute patterns include leading industry context around Healthcare, Education, and Retail trade; about 14.4% of workers reporting work-from-home (roughly in line with 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 $860,200 — about 147% above the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $2,375 (about 104% above the U.S. median rent ($1,163)), and owner-occupancy near 73.2% (about 7.8 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 91739 in Rancho Cucamonga, CA, a household would need roughly $237,000 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 $5,526. That is about 68% above the local median household income ($141,475), 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 2,053 for ZIP 91739 (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.