ZIP Code 21791 — Union Bridge town, MD Demographics & Data

ZIP code 21791 covers Union Bridge, MD in Frederick County with a population of about 4,734.

At a glance, the area shows median age of 40.9 versus a U.S. median of about 38.9.

It sits in telephone area codes 227, 240, 301, 410, and 2 more; U.S. House district MD-6; the BALTIMORE media market.

Median household income in ZIP 21791 is about $90,460 — about 20% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 6.5%; unemployment rate near 2.4%; 26.3% of adults with a bachelor’s degree or higher (about 7.4 points below the national share (33.7%)).

Labor and commute patterns include leading industry context around Construction, Public administration, and Professional services; about 8.1% of workers reporting work-from-home (about 7.1 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 $370,300 — about 6% above the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $1,005 (about 14% below the U.S. median rent ($1,163)), and owner-occupancy near 83.6% (about 18.2 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 21791 in Union Bridge, MD, a household would need roughly $102,000 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 $2,379. That is roughly in line with the local median household income ($90,460). 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 Bridge town, 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 Union Bridge town, MD show little to no average snow and around 46.6 inches of annual precipitation.

IRS migration statistics show a net inflow of about 278 for ZIP 21791 (Union Bridge town, 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.