ZIP Code 21770 — Green Valley CDP, MD Demographics & Data

ZIP code 21770 covers Green Valley, MD in Frederick County with a population of about 7,815.

At a glance, the area shows median age of 41.2 versus a U.S. median of about 38.9.

It sits in telephone area codes 227, 240, 301; U.S. House district MD-6; the WASHINGTON, DC (HAGRSTWN) media market.

Green Valley, MD 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 21770 is about $184,464 — about 145% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 1.4%; unemployment rate near 2.2%; 54.5% of adults with a bachelor’s degree or higher (about 20.8 points above the national share (33.7%)).

Labor and commute patterns include leading industry context around Professional services, Public administration, and Education; about 25.7% of workers reporting work-from-home (about 10.5 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 $599,700 — about 72% above the U.S. median home value ($348,079).

Housing tenure and rents show owner-occupancy near 98.0% (about 32.5 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 21770 in Green Valley, MD, a household would need roughly $165,000 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 $3,852. That sits below the local median household income ($184,464), suggesting the typical household income is closer to a workable buy-in level under these assumptions. 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 Green Valley CDP, MD as Relatively Low (composite score 74.2), which is elevated versus much of the country. The strongest component scores on US5 are flood (81.6) and hurricane (79.3). 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 Green Valley CDP, MD show little to no average snow and around 47.9 inches of annual precipitation.

IRS migration statistics show a net inflow of about 459 for ZIP 21770 (Green Valley CDP, MD) 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.