21037 vs 21140 — Compare ZIP Codes
Side-by-side comparison. Blue = ZIP 21037, Orange = ZIP 21140.
Quick verdict: ZIP 21037 is more affordable rent, more diverse, higher work-from-home share. ZIP 21140 is wealthier, higher home values, lower poverty rate, lower unemployment, more educated.
Quick Facts
ZIP 21037
Mayo CDP, MD
View full profile →- Population20,851
- Median Income$135,541
- Median Home Value$531k
- Median Rent$1,954
- Median Age41.4 yrs
- Poverty Rate4.0%
ZIP 21140
Riva CDP, MD
View full profile →- Population4,231
- Median Income$152,188
- Median Home Value$598k
- Median Rent$2,071
- Median Age44.2 yrs
- Poverty Rate0.8%
Visual comparison (same scale)
Population
20,8514,231
Median Income
$135,541$152,188
Median Home Value
$531k$598k
Median Rent
$1,954$2,071
Median Age
41.4 yrs44.2 yrs
Poverty Rate
4.0%0.8%
Demographics
ZIP 21037
Mayo CDP, MD
View full profile →- White %87.5%
- Black %5.3%
- Asian %1.0%
- Hispanic %5.6%
- Age 0–17 %22.0%
- Age 18–64 %61.3%
- Age 65+ %16.7%
- Bachelor's+ %46.2%
- Diversity Index23/100
ZIP 21140
Riva CDP, MD
View full profile →- White %90.8%
- Black %0.3%
- Asian %0.8%
- Hispanic %8.3%
- Age 0–17 %26.0%
- Age 18–64 %48.9%
- Age 65+ %25.1%
- Bachelor's+ %51.7%
- Diversity Index17/100
Visual comparison (same scale)
White %
87.5%90.8%
Black %
5.3%0.3%
Asian %
1.0%0.8%
Hispanic %
5.6%8.3%
Age 0–17 %
22.0%26.0%
Age 18–64 %
61.3%48.9%
Age 65+ %
16.7%25.1%
Bachelor's+ %
46.2%51.7%
Diversity Index
23/10017/100
Economy
ZIP 21037
Mayo CDP, MD
View full profile →- Median Income$135,541
- Unemployment %3.8%
- IRS Net Migration+1,225
- Work From Home %24.6%
ZIP 21140
Riva CDP, MD
View full profile →- Median Income$152,188
- Unemployment %0.7%
- IRS Net Migration+249
- Work From Home %22.9%
Visual comparison (same scale)
Median Income
$135,541$152,188
Unemployment %
3.8%0.7%
IRS Net Migration
+1,225+249
Work From Home %
24.6%22.9%
Housing
ZIP 21037
Mayo CDP, MD
View full profile →- Median Home Value$531k
- Median Rent$1,954
- Owner Occupied %89.3%
- Broadband %95.6%
- Vacant %8.6%
- Median Year Built1984
ZIP 21140
Riva CDP, MD
View full profile →- Median Home Value$598k
- Median Rent$2,071
- Owner Occupied %97.6%
- Broadband %96.3%
- Vacant %2.5%
- Median Year Built1979
Visual comparison (same scale)
Median Home Value
$531k$598k
Median Rent
$1,954$2,071
Owner Occupied %
89.3%97.6%
Broadband %
95.6%96.3%
Vacant %
8.6%2.5%
Median Year Built
19841979
Climate & Location
ZIP 21037
Mayo CDP, MD
View full profile →- Snow Days/Year0 days
- Elevation (ft)25 ft
- Nearest Airport16.3 miles (26.3 km)
- Distance to Coast0.8 miles (1.2 km)
ZIP 21140
Riva CDP, MD
View full profile →- Snow Days/Year0 days
- Elevation (ft)25 ft
- Nearest Airport13.6 miles (21.8 km)
- Distance to Coast0.6 miles (1.0 km)
Visual comparison (same scale)
Snow Days/Year
0 days0 days
Elevation (ft)
25 ft25 ft
Nearest Airport
16.3 miles (26.3 km)13.6 miles (21.8 km)
Distance to Coast
0.8 miles (1.2 km)0.6 miles (1.0 km)
Infrastructure
Visual comparison (same scale)
Work From Home %
24.6%22.9%
Walkability (0–100)
4644
Broadband %
95.6%96.3%
Frequently Asked Questions
How do ZIP 21037 and 21140 compare?
ZIP 21037 is more affordable rent, more diverse, higher work-from-home share. ZIP 21140 is wealthier, higher home values, lower poverty rate, lower unemployment, more educated.
What do the blue and orange colors mean?
Blue represents the first ZIP (21037), orange the second (21140). 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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