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Area data

Rocky Ridge, MD — ZIP 21778

Population: 745 (Census ACS)

The median home value in ZIP 21778 (Rocky Ridge, MD) is $450,439 — up 1.8% over the past year. Homes sell for a median $397,500 after a median 97.5 days on market. FEMA's National Risk Index rates the county's overall natural-hazard risk Relatively Low, with lightning, winterweather, drought the top-rated hazards. Cost of living is 8.0% above the US average (BEA, metro/state-level).

Backed by 25+ public sourcesFEMA · U.S. Census · NOAA · Dept. of Education · EPA · and more

$450,439

Median home value

+1.8%

1-year change

97.5

Median days on market

Relatively Low

Hazard risk (county)

Home values & appreciation

Median home value
$450,439
1-year appreciation
+1.8%
3-year appreciation
+14.9%
5-year appreciation
+26.5%
10-year appreciation
+73.1%
All-time peak (2026-07)
$450,439
House Price Index (state)
367.5 (+0.7% YoY)

Sources: home value index (ZIP-level) · FHFA House Price Index (state-level)

Market activity

Median sale price
$397,500
Median price per sqft
$236
1-year sale-price change
+16.1%
Median days on market
97.5 days
Homes sold (recent period)
2
Sale-to-list ratio
98.5%
1-year forecast
+0.4%

Source: recent area sales and market data (ZIP-level)

Rents

Studio fair-market rent
$1,110/mo
1BR fair-market rent
$1,160/mo
2BR fair-market rent
$1,310/mo
3BR fair-market rent
$1,650/mo
4BR fair-market rent
$1,920/mo

Sources: market rent index (ZIP-level) · HUD Fair Market Rents (metro/county-level, 40th-percentile regulatory reference)

Affordability

Cost of living index (Above Average)
108.0 (100 = US avg)
Electricity rate (state-level)
19.5¢/kWh
Natural gas rate (state-level)
$16.10/MCF
30-year mortgage rate (national)
6.66%
15-year mortgage rate (national)
6.00%

Sources: BEA Regional Price Parities (metro/state-level) · EIA energy rates (state-level) · Freddie Mac PMMS (national)

Natural hazards & flood risk

Overall hazard risk (county)
Relatively Low
Top hazards (county)
lightning, winterWeather, drought, hail, heatWave
Notable hazard ratings (county)
coldWave: Relatively Low · drought: Relatively Moderate · earthquake: Relatively Low · hail: Relatively Moderate · heatWave: Relatively Moderate · hurricane: Relatively Low
Wildfire risk to homes (county)
Higher than 27% of US counties
Buildings in wildfire direct-exposure zone
58.6%
Radon potential (county)
High radon potential — EPA Zone 1 of 3
EPA Superfund (NPL) sites within 5 mi
None
Nearest Superfund site
Fort Detrick Area B Ground Water (14.1 mi)
EPA recommends radon testing for every home regardless of zone.

Sources: FEMA National Risk Index (county-level) · FEMA flood data (ZIP-level) · USDA Forest Service Wildfire Risk to Communities (county-level) · EPA radon zones + Superfund NPL

Climate (30-year normals)

Average annual temperature
54.0°F
Average high
63.0°F
Average low
46.0°F
Annual precipitation
48.7 in
Annual snowfall
31.2 in
USDA plant hardiness zone
7a (extreme annual low 0 to 5°F)

Sources: NOAA Climate Normals (30-year, nearest-station) · USDA Plant Hardiness Zone Map (2023)

Air quality

Air quality rating
Good
Median AQI (annual)
44
Days with Good air quality
167
Days with Moderate air quality
59
Highest AQI recorded (year)
136

Source: EPA air quality data (nearest monitoring station, annual)

Amenities

National parks within ~60 mi
51
Nearest national park
Catoctin Mountain Park (7 mi)
National parks include
Catoctin Mountain Park, Eisenhower National Historic Site, Gettysburg National Military Park
Airports within 30 mi
46
Nearest airport
Catoctin Crosswind Airport (3 mi)
Nearest major airport
Hagerstown Regional Richard A Henson Field (HGR) (22 mi)
Hospitals nearby (~15 mi)
1,090
Hospitals include
MIZELL MEMORIAL HOSPITAL, CRENSHAW COMMUNITY HOSPITAL, CRENSHAW COMMUNITY HOSPITAL
Avg hospital rating (CMS)
3.1 / 5
Best hospital rating nearby (CMS)
5.0 / 5
EV charging stations (within 10 mi)
40
Solar radiation rating
Fair (4.0 kWh/m²/day)

Sources: National Park Service · FAA airport data · CMS hospital data · DOE/NREL (proximity-based)

Migration

Net migration (county)
+1,322 tax filers

Source: IRS county-to-county migration data (county-level, ~12-month lag)

Housing stock

Median year housing built
1,979
Housing built before 1970
22.9%
Housing built 2000 or later
16.0%
Median annual property tax
$3,449
Households with broadband internet
17.5%

Source: Census ACS 5-year estimates (ZIP-level)

Employment & development

Total county employment
88,630
Average weekly wage
$1,235
Top industries (by employment)
Health Care, Professional Services, Accommodation & Food
Annual residential building permits (county)
1,185

Sources: BLS QCEW (county-level) · Census Building Permits (county-level)

How it compares

ZIP 21778State medianUS median
Median home value$450,439$452,533$289,727
Median sale price$397,500$450,000$325,000
Median days on market98 days40 days51 days
Median annual property tax$3,449$3,862$2,006

State and US medians are computed across all US ZIP codes with sufficient public-data coverage, from the same sources as the figures above.

Area data compiled from public government, academic, and industry research feeds. Data sources →

Common questions

What is the median home value in ZIP 21778?
$450,439.
What is the median sale price in ZIP 21778?
$397,500.
How long do homes take to sell in ZIP 21778?
Median days on market: 97.5 days.
What is typical rent in ZIP 21778?
2-bedroom fair-market rent: $1,310/month (HUD FMR — a 40th-percentile regulatory reference, not market-observed).
What is the natural-hazard risk in ZIP 21778?
Overall risk: Relatively Low (FEMA NRI, county-level). Top hazards: lightning, winterWeather, drought, hail, heatWave.
What is the wildfire risk in ZIP 21778?
Risk to homes is higher than 27% of US counties (USDA Forest Service Wildfire Risk to Communities, county-level).
What is the radon potential in ZIP 21778?
High radon potential — EPA Zone 1 of 3, county-level. EPA recommends testing every home regardless of zone.
Are there Superfund sites near ZIP 21778?
No current or proposed National Priorities List sites within 5 miles (EPA).
What is the air quality in ZIP 21778?
Good. Median AQI: 44. (EPA AQI).
What is the cost of living in ZIP 21778?
Regional Price Parity: 108.0 (100 = US average) (Above Average) (BEA RPP, metro/state-level).

Nearby ZIP codes

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Data last updated

Most recent source refresh: Sep 2026. See all data sources →

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