ZIP Code 92831 — Fullerton city, CA Demographics & Data

ZIP code 92831 covers Fullerton, CA in Orange County with a population of about 35,831.

At a glance, the area shows median age of 31.7 versus a U.S. median of about 38.9.

It sits in telephone area codes 657, 714; U.S. House district CA-45; the LOS ANGELES media market.

Fullerton, CA sits in a university / college context (near california state university-fullerton (0.6 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 92831 is about $89,451 — about 19% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 16.1%; unemployment rate near 7.9%; 44.4% of adults with a bachelor’s degree or higher (about 10.7 points above the national share (33.7%)).

Labor and commute patterns include leading industry context around Education, Retail trade, and Healthcare; about 14.2% 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 $821,300 — about 136% above the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $1,965 (about 69% above the U.S. median rent ($1,163)), and owner-occupancy near 40.4% (about 25.0 points below the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 92831 in Fullerton, CA, a household would need roughly $226,000 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 $5,276. That is about 153% above the local median household income ($89,451), 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 Fullerton city, CA as Very High (composite score 99.8), which is among the highest nationally. The strongest component scores on US5 are flood (99.8) and wildfire (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 Fullerton city, CA show little to no average snow and around 13.5 inches of annual precipitation.

IRS migration statistics show a net inflow of about 1,763 for ZIP 92831 (Fullerton 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.