Mount Airy 21771

Frederick County, MD · 11,211 properties · updated 7/5/2026

Should you buy here?buyer-timing lens

59affordability /100

Buyer leverage is seller slight; weigh payment burden and the 3-lens valuation before bidding.

Payment burden
25.2%
affordable
Days on market
28
daily
Price cuts
14.9%
of active
Valuation
-46.6%
vs assessor
Look up an address
67
/100
stable
stable · seller slight · prices rising year-over-year.

Verdict grades housing conditions; buyer-timing, investor cash-flow, supply-tightness and county macro scores answer different questions — each in its own section.

Buyer / sellerbuyer-timing lens

51/ 100SellerBalancedBuyer
Balanced Market
DOM: 30d (stable) · Market Dynamics rolling median · hourly
Score Components
Payment Burden (25%)25
Valuation Gap (25%)60
Supply & Demand (20%)70
Buy vs Rent (15%)100
Cancellation Rate (10%)0
Days on Market (5%)20

Balanced market in 21771. List price is roughly fair — focus on condition and value. Payment burden: 25.2% of median income. Median days on market: 30. Renting is approximately 112% cheaper than buying (price-to-rent ratio: 25.5).

Balanced market conditions. Prices roughly aligned with fundamentals — similar to stable periods in 2014-2015.
STABLESELLER SLIGHT

Market is holding steady with balanced conditions. Sellers hold a slight edge.

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Market snapshoteach number, once

Median price
$643,166
▴ 0.8% YoY
Days on market
28
daily · zip_data
Median rent
$2,100
ZORI
Investor score
37/100
cash-flow lens
Active listings
61
90-day

Valuation3 lenses, different anchors

vs assessor
-46.6%
Market vs assessed value — a tax-roll lag, not a deal signal.
Avg assessor$343,700
county CAMA · properties_v
vs income
—
Fair-value model not available for this market.
fair_value_scores · 10-state coverage
vs county comps
+50.9%
County-wide market — the widest, slowest signal.
Frederick+50.9%
Carroll+49.7%
Howard+43.7%
Lotvox comps · mv_valuation_gap
Read together: Above county comps but sustainable on local incomes.
Pricing detail
Price / sqft$222
Price-to-income4.2×

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How 21771 ranks in MD
percentile vs all MD ZIPs
Comparative ranking not available for this ZIP.

Affordability, supply & momentum

47SUPPLY
BalancedSupply Tightness

Supply and demand are roughly even — standard negotiation dynamics.

Months of Supply6.6 mo
Days on Market28d
Inv vs History+32.3%
Listing Density--
Market dynamics
Price cut %14.9%
Momentumstable
LeverageSELLER SLIGHT
Months of supply6.6
Sales (90d)0
Investment analysis
Median rent$2,100
Price-to-rent25.5
Est. cap rate2.5%
Buy vs rentfavors renting

Livability

Walk score2
Transit score1
Bike score—

Historical trends

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Frederick County contextmacro · jobs · debt · migration

ZIP score grades housing; county score adds macro distress (jobs, debt, poverty). They answer different questions.

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Washington DC Metro·Overpriced ZIPs·Investor ZIPs·View on Map·Frederick County