ZIP Code 20124 — Union Mill CDP, VA Demographics & Data

ZIP code 20124 covers Union Mill, VA in Fairfax County with a population of about 14,557.

At a glance, the area shows median age of 47.2 versus a U.S. median of about 38.9.

It sits in telephone area codes 571, 703; U.S. House district VA-10; the WASHINGTON, DC (HAGRSTWN) media market.

Union Mill, VA aligns with a tech / corporate-campus profile (high remote-work / education / income profile or known campus context). Broadband quality, remote-work share, and nearby employer campuses often matter as much as classic residential stats.

Median household income in ZIP 20124 is about $218,942 — about 191% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 2.8%; unemployment rate near 4.1%; 74.5% of adults with a bachelor’s degree or higher (about 40.8 points above the national share (33.7%)).

Labor and commute patterns include leading industry context around Professional services, Education, and Healthcare; about 27.8% of workers reporting work-from-home (about 12.6 points above 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 $870,200 — about 150% above the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $2,134 (about 83% above the U.S. median rent ($1,163)), and owner-occupancy near 92.8% (about 27.3 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 20124 in Union Mill, VA, a household would need roughly $240,000 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 $5,590. That is roughly in line with the local median household income ($218,942). 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 Union Mill CDP, VA as Very Low (composite score 5.3), which is relatively lower than many U.S. communities. The strongest component scores on US5 are hurricane (62.2) and flood (13.5). 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 Union Mill CDP, VA show little to no average snow.

IRS migration statistics show a net inflow of about 821 for ZIP 20124 (Union Mill CDP, VA) 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.