20871 vs 21770 — Compare ZIP Codes
Side-by-side comparison. Blue = ZIP 20871, Orange = ZIP 21770.
Quick verdict: ZIP 20871 is higher home values, more diverse, more educated, higher work-from-home share. ZIP 21770 is wealthier, lower poverty rate, lower unemployment.
Quick Facts
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%
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%
Visual comparison (same scale)
Population
28,3297,815
Median Income
$177,120$184,464
Median Home Value
$629k$600k
Median Rent
$2,134—
Median Age
37.9 yrs41.2 yrs
Poverty Rate
4.5%1.4%
Demographics
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
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
Visual comparison (same scale)
White %
32.4%76.3%
Black %
15.0%5.0%
Asian %
38.2%12.0%
Hispanic %
12.5%3.9%
Age 0–17 %
30.0%21.8%
Age 18–64 %
61.3%59.2%
Age 65+ %
8.8%18.9%
Bachelor's+ %
67.6%54.5%
Diversity Index
71/10040/100
Economy
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%
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%
Visual comparison (same scale)
Median Income
$177,120$184,464
Unemployment %
4.3%2.2%
IRS Net Migration
+1,664+459
Work From Home %
26.6%25.7%
Housing
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
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
Visual comparison (same scale)
Median Home Value
$629k$600k
Median Rent
$2,134—
Owner Occupied %
87.1%98.0%
Broadband %
98.5%96.4%
Vacant %
1.7%2.2%
Median Year Built
20091988
Climate & Location
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)
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)
Visual comparison (same scale)
Snow Days/Year
0 days0 days
Elevation (ft)
700 ft700 ft
Nearest Airport
23.8 miles (38.3 km)30.0 miles (48.3 km)
Distance to Coast
25.7 miles (41.3 km)31.0 miles (50.0 km)
Infrastructure
ZIP 20871
Clarksburg CDP, MD
View full profile →- Work From Home %26.6%
- Walkability (0–100)29
- Broadband %98.5%
ZIP 21770
Green Valley CDP, MD
View full profile →- Work From Home %25.7%
- Walkability (0–100)28
- Broadband %96.4%
Visual comparison (same scale)
Work From Home %
26.6%25.7%
Walkability (0–100)
2928
Broadband %
98.5%96.4%
Frequently Asked Questions
How do ZIP 20871 and 21770 compare?
ZIP 20871 is higher home values, more diverse, more educated, higher work-from-home share. ZIP 21770 is wealthier, lower poverty rate, lower unemployment.
What do the blue and orange colors mean?
Blue represents the first ZIP (20871), orange the second (21770). 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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