20877 vs 20851 — Compare ZIP Codes
Side-by-side comparison. Blue = ZIP 20877, Orange = ZIP 20851.
Quick verdict: ZIP 20877 is more affordable rent. ZIP 20851 is wealthier, higher home values, lower poverty rate, lower unemployment, more diverse, more educated, higher work-from-home share.
Quick Facts
ZIP 20877
Gaithersburg city, MD
View full profile →- Population39,068
- Median Income$86,103
- Median Home Value$463k
- Median Rent$1,729
- Median Age37.2 yrs
- Poverty Rate11.3%
ZIP 20851
Rockville city, MD
View full profile →- Population14,660
- Median Income$113,951
- Median Home Value$524k
- Median Rent$1,843
- Median Age38.6 yrs
- Poverty Rate9.2%
Visual comparison (same scale)
Population
39,06814,660
Median Income
$86,103$113,951
Median Home Value
$463k$524k
Median Rent
$1,729$1,843
Median Age
37.2 yrs38.6 yrs
Poverty Rate
11.3%9.2%
Demographics
ZIP 20877
Gaithersburg city, MD
View full profile →- White %24.6%
- Black %16.1%
- Asian %14.4%
- Hispanic %47.4%
- Age 0–17 %24.5%
- Age 18–64 %60.5%
- Age 65+ %15.1%
- Bachelor's+ %35.2%
- Diversity Index67/100
ZIP 20851
Rockville city, MD
View full profile →- White %33.0%
- Black %11.8%
- Asian %14.1%
- Hispanic %42.2%
- Age 0–17 %19.9%
- Age 18–64 %68.0%
- Age 65+ %12.1%
- Bachelor's+ %41.4%
- Diversity Index68/100
Visual comparison (same scale)
White %
24.6%33.0%
Black %
16.1%11.8%
Asian %
14.4%14.1%
Hispanic %
47.4%42.2%
Age 0–17 %
24.5%19.9%
Age 18–64 %
60.5%68.0%
Age 65+ %
15.1%12.1%
Bachelor's+ %
35.2%41.4%
Diversity Index
67/10068/100
Economy
ZIP 20877
Gaithersburg city, MD
View full profile →- Median Income$86,103
- Unemployment %6.2%
- IRS Net Migration+2,295
- Work From Home %15.9%
ZIP 20851
Rockville city, MD
View full profile →- Median Income$113,951
- Unemployment %3.8%
- IRS Net Migration+861
- Work From Home %23.6%
Visual comparison (same scale)
Median Income
$86,103$113,951
Unemployment %
6.2%3.8%
IRS Net Migration
+2,295+861
Work From Home %
15.9%23.6%
Housing
ZIP 20877
Gaithersburg city, MD
View full profile →- Median Home Value$463k
- Median Rent$1,729
- Owner Occupied %43.9%
- Broadband %93.2%
- Vacant %5.3%
- Median Year Built1985
ZIP 20851
Rockville city, MD
View full profile →- Median Home Value$524k
- Median Rent$1,843
- Owner Occupied %56.7%
- Broadband %91.9%
- Vacant %3.6%
- Median Year Built1958
Visual comparison (same scale)
Median Home Value
$463k$524k
Median Rent
$1,729$1,843
Owner Occupied %
43.9%56.7%
Broadband %
93.2%91.9%
Vacant %
5.3%3.6%
Median Year Built
19851958
Climate & Location
ZIP 20877
Gaithersburg city, MD
View full profile →- Snow Days/Year0 days
- Elevation (ft)440 ft
- Nearest Airport19.6 miles (31.5 km)
- Distance to Coast16.2 miles (26.0 km)
ZIP 20851
Rockville city, MD
View full profile →- Snow Days/Year0 days
- Elevation (ft)440 ft
- Nearest Airport16.3 miles (26.3 km)
- Distance to Coast11.3 miles (18.1 km)
Visual comparison (same scale)
Snow Days/Year
0 days0 days
Elevation (ft)
440 ft440 ft
Nearest Airport
19.6 miles (31.5 km)16.3 miles (26.3 km)
Distance to Coast
16.2 miles (26.0 km)11.3 miles (18.1 km)
Infrastructure
ZIP 20877
Gaithersburg city, MD
View full profile →- Work From Home %15.9%
- Walkability (0–100)65
- Broadband %93.2%
ZIP 20851
Rockville city, MD
View full profile →- Work From Home %23.6%
- Walkability (0–100)67
- Broadband %91.9%
Visual comparison (same scale)
Work From Home %
15.9%23.6%
Walkability (0–100)
6567
Broadband %
93.2%91.9%
Frequently Asked Questions
How do ZIP 20877 and 20851 compare?
ZIP 20877 is more affordable rent. ZIP 20851 is wealthier, higher home values, lower poverty rate, lower unemployment, more diverse, more educated, higher work-from-home share.
What do the blue and orange colors mean?
Blue represents the first ZIP (20877), orange the second (20851). 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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