20899 vs 20851 — Compare ZIP Codes
Side-by-side comparison. Blue = ZIP 20899, Orange = ZIP 20851.
Quick verdict: ZIP 20899 is more affordable rent. ZIP 20851 is wealthier, lower poverty rate, lower unemployment, more diverse, more educated, higher work-from-home share.
Quick Facts
ZIP 20899
Gaithersburg city, MD
View full profile →- Population106
- Median Income$23,917
- Median Home Value—
- Median Rent$835
- Median Age70.4 yrs
- Poverty Rate17.0%
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
10614,660
Median Income
$23,917$113,951
Median Home Value
—$524k
Median Rent
$835$1,843
Median Age
70.4 yrs38.6 yrs
Poverty Rate
17.0%9.2%
Demographics
ZIP 20899
Gaithersburg city, MD
View full profile →- White %30.2%
- Black %69.8%
- Asian %0.0%
- Hispanic %0.0%
- Age 0–17 %0.0%
- Age 18–64 %46.2%
- Age 65+ %53.8%
- Bachelor's+ %33.0%
- Diversity Index42/100
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 %
30.2%33.0%
Black %
69.8%11.8%
Asian %
0.0%14.1%
Hispanic %
0.0%42.2%
Age 0–17 %
0.0%19.9%
Age 18–64 %
46.2%68.0%
Age 65+ %
53.8%12.1%
Bachelor's+ %
33.0%41.4%
Diversity Index
42/10068/100
Economy
ZIP 20899
Gaithersburg city, MD
View full profile →- Median Income$23,917
- Unemployment %56.3%
- IRS Net Migration+6
- Work From Home %0.0%
- Mean Commute (min)14 min
ZIP 20851
Rockville city, MD
View full profile →- Median Income$113,951
- Unemployment %3.8%
- IRS Net Migration+861
- Work From Home %23.6%
- Mean Commute (min)—
Visual comparison (same scale)
Median Income
$23,917$113,951
Unemployment %
56.3%3.8%
IRS Net Migration
+6+861
Work From Home %
0.0%23.6%
Mean Commute (min)
14 min—
Housing
ZIP 20899
Gaithersburg city, MD
View full profile →- Median Home Value—
- Median Rent$835
- Owner Occupied %0.0%
- Broadband %52.8%
- Vacant %0.0%
- 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
—$524k
Median Rent
$835$1,843
Owner Occupied %
0.0%56.7%
Broadband %
52.8%91.9%
Vacant %
0.0%3.6%
Median Year Built
19851958
Climate & Location
ZIP 20899
Gaithersburg city, MD
View full profile →- Snow Days/Year0 days
- Elevation (ft)440 ft
- Nearest Airport18.8 miles (30.3 km)
- Distance to Coast16.8 miles (27.0 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
18.8 miles (30.3 km)16.3 miles (26.3 km)
Distance to Coast
16.8 miles (27.0 km)11.3 miles (18.1 km)
Infrastructure
ZIP 20899
Gaithersburg city, MD
View full profile →- Mean Commute (min)14 min
- Work From Home %0.0%
- Walkability (0–100)0
- Broadband %52.8%
ZIP 20851
Rockville city, MD
View full profile →- Mean Commute (min)—
- Work From Home %23.6%
- Walkability (0–100)67
- Broadband %91.9%
Visual comparison (same scale)
Mean Commute (min)
14 min—
Work From Home %
0.0%23.6%
Walkability (0–100)
067
Broadband %
52.8%91.9%
Frequently Asked Questions
How do ZIP 20899 and 20851 compare?
ZIP 20899 is more affordable rent. ZIP 20851 is wealthier, 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 (20899), 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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