21770 vs 20871 — Compare ZIP Codes
Side-by-side comparison. Blue = ZIP 21770, Orange = ZIP 20871.
Quick verdict: ZIP 21770 is wealthier, lower poverty rate, lower unemployment. ZIP 20871 is higher home values, more diverse, more educated, higher work-from-home share.
Quick Facts
ZIP 21770
Green Valley CDP, MD
View full profile →- Population7,815
- Median Income$184,464
- Median Home Value$600k
- Median Rent—
- Median Age41.2 yrs
- Poverty Rate1.4%
ZIP 20871
Clarksburg CDP, MD
View full profile →- Population28,329
- Median Income$177,120
- Median Home Value$629k
- Median Rent$2,134
- Median Age37.9 yrs
- Poverty Rate4.5%
Visual comparison (same scale)
Population
7,81528,329
Median Income
$184,464$177,120
Median Home Value
$600k$629k
Median Rent
—$2,134
Median Age
41.2 yrs37.9 yrs
Poverty Rate
1.4%4.5%
Demographics
ZIP 21770
Green Valley CDP, MD
View full profile →- White %76.3%
- Black %5.0%
- Asian %12.0%
- Hispanic %3.9%
- Age 0–17 %21.8%
- Age 18–64 %59.2%
- Age 65+ %18.9%
- Bachelor's+ %54.5%
- Diversity Index40/100
ZIP 20871
Clarksburg CDP, MD
View full profile →- White %32.4%
- Black %15.0%
- Asian %38.2%
- Hispanic %12.5%
- Age 0–17 %30.0%
- Age 18–64 %61.3%
- Age 65+ %8.8%
- Bachelor's+ %67.6%
- Diversity Index71/100
Visual comparison (same scale)
White %
76.3%32.4%
Black %
5.0%15.0%
Asian %
12.0%38.2%
Hispanic %
3.9%12.5%
Age 0–17 %
21.8%30.0%
Age 18–64 %
59.2%61.3%
Age 65+ %
18.9%8.8%
Bachelor's+ %
54.5%67.6%
Diversity Index
40/10071/100
Economy
ZIP 21770
Green Valley CDP, MD
View full profile →- Median Income$184,464
- Unemployment %2.2%
- IRS Net Migration+459
- Work From Home %25.7%
ZIP 20871
Clarksburg CDP, MD
View full profile →- Median Income$177,120
- Unemployment %4.3%
- IRS Net Migration+1,664
- Work From Home %26.6%
Visual comparison (same scale)
Median Income
$184,464$177,120
Unemployment %
2.2%4.3%
IRS Net Migration
+459+1,664
Work From Home %
25.7%26.6%
Housing
ZIP 21770
Green Valley CDP, MD
View full profile →- Median Home Value$600k
- Median Rent—
- Owner Occupied %98.0%
- Broadband %96.4%
- Vacant %2.2%
- Median Year Built1988
ZIP 20871
Clarksburg CDP, MD
View full profile →- Median Home Value$629k
- Median Rent$2,134
- Owner Occupied %87.1%
- Broadband %98.5%
- Vacant %1.7%
- Median Year Built2009
Visual comparison (same scale)
Median Home Value
$600k$629k
Median Rent
—$2,134
Owner Occupied %
98.0%87.1%
Broadband %
96.4%98.5%
Vacant %
2.2%1.7%
Median Year Built
19882009
Climate & Location
ZIP 21770
Green Valley CDP, MD
View full profile →- Snow Days/Year0 days
- Elevation (ft)700 ft
- Nearest Airport30.0 miles (48.3 km)
- Distance to Coast31.0 miles (50.0 km)
ZIP 20871
Clarksburg CDP, MD
View full profile →- Snow Days/Year0 days
- Elevation (ft)700 ft
- Nearest Airport23.8 miles (38.3 km)
- Distance to Coast25.7 miles (41.3 km)
Visual comparison (same scale)
Snow Days/Year
0 days0 days
Elevation (ft)
700 ft700 ft
Nearest Airport
30.0 miles (48.3 km)23.8 miles (38.3 km)
Distance to Coast
31.0 miles (50.0 km)25.7 miles (41.3 km)
Infrastructure
ZIP 21770
Green Valley CDP, MD
View full profile →- Work From Home %25.7%
- Walkability (0–100)28
- Broadband %96.4%
ZIP 20871
Clarksburg CDP, MD
View full profile →- Work From Home %26.6%
- Walkability (0–100)29
- Broadband %98.5%
Visual comparison (same scale)
Work From Home %
25.7%26.6%
Walkability (0–100)
2829
Broadband %
96.4%98.5%
Frequently Asked Questions
How do ZIP 21770 and 20871 compare?
ZIP 21770 is wealthier, lower poverty rate, lower unemployment. ZIP 20871 is higher home values, more diverse, more educated, higher work-from-home share.
What do the blue and orange colors mean?
Blue represents the first ZIP (21770), orange the second (20871). The same colors are used in the map markers and comparison bars.
Where does this data come from?
Data is from the U.S. Census Bureau and other federal sources. See our Methodology page for details.
How can I compare other ZIP codes?
From any ZIP page, use the "Compare with Another ZIP" tool, or go to /compare/XXXXX-vs-YYYYY (replace with two 5-digit ZIP codes).
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