ZIP Code 20851 — Rockville city, MD Demographics & Data

ZIP code 20851 covers Rockville, MD in Montgomery County with a population of about 14,660.

At a glance, the area shows median age of 38.6 (near the U.S. median).

It sits in telephone area codes 227, 240, 301; U.S. House district MD-8; the WASHINGTON, DC (HAGRSTWN) media market.

Rockville, MD sits in a university / college context (near montgomery college (2.4 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 20851 is about $113,951 — about 52% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 9.2%; unemployment rate near 3.8%; 41.4% of adults with a bachelor’s degree or higher (about 7.7 points above the national share (33.7%)).

Labor and commute patterns include leading industry context around Professional services, Construction, and Healthcare; about 23.6% of workers reporting work-from-home (about 8.4 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 $523,800 — about 50% above the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $1,843 (about 58% above the U.S. median rent ($1,163)), and owner-occupancy near 56.7% (about 8.7 points below the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 20851 in Rockville, MD, a household would need roughly $144,000 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 $3,365. That is about 26% above the local median household income ($113,951), 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 Rockville city, MD as Relatively Moderate (composite score 91.7), which is among the highest nationally. The strongest component scores on US5 are flood (93.7) and hurricane (91.8). 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 Rockville city, MD show little to no average snow and around 41.3 inches of annual precipitation.

IRS migration statistics show a net inflow of about 861 for ZIP 20851 (Rockville city, 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.