ZIP Code 91978 — Spring Valley CDP, CA Demographics & Data

ZIP code 91978 covers Spring Valley, CA in San Diego County with a population of about 10,511.

At a glance, the area shows median age of 38.4 (near the U.S. median).

It sits in telephone area codes 619, 858; U.S. House district CA-48; the SAN DIEGO media market.

Spring Valley, CA sits in a university / college context (near cuyamaca college (1.4 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 91978 is about $111,506 — about 48% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 13.4%; unemployment rate near 6.9%; 30.6% of adults with a bachelor’s degree or higher (about 3.1 points below the national share (33.7%)).

Labor and commute patterns include leading industry context around Retail trade, Construction, and Healthcare; about 12.1% of workers reporting work-from-home (about 3.1 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 $597,300 — about 72% above the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $2,089 (about 80% above the U.S. median rent ($1,163)), and owner-occupancy near 65.8% (roughly in line with the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 91978 in Spring Valley, 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 $3,837. That is about 47% above the local median household income ($111,506), 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 Spring Valley CDP, CA as Very High (composite score 99.7), which is among the highest nationally. The strongest component scores on US5 are wildfire (100.0) and flood (99.7). 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 Spring Valley CDP, CA show little to no average snow and around 11.6 inches of annual precipitation.

IRS migration statistics show a net inflow of about 517 for ZIP 91978 (Spring Valley CDP, 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.