The ZIP Code maps and database are updated 4 times per year. Database updated: March 1, 2026, Maps updated: May 1, 2024.
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Gaithersburg, MD 20879 Data & Demographics
Source: 2020-2024 American Community Survey 5-Year Estimates
POPULATION
Total Population
25,264 (100%)
Population Density
2,932 per sq mi
Diversity Index1
76
INCOME
Median Household Income
$112,104
Per Capita Income
$48,025
Median Home Value
$468,100
HOUSING
Total HU (Housing Units)
8,818 (100%)
Owner Occupied HU
6,040 (68.5%)
Renter Occupied HU
2,611 (29.6%)
Vacant Housing Units
167 (1.9%)
HOUSEHOLDS
Total Households
8,651
Average Household Size
2.91
Family Households
6,085 (70.3%)
NOTES
The Diversity Index estimates the likelihood that two persons chosen at random from the same area belong to different race or ethnic groups, based on five groups: Hispanic/Latino, Non-Hispanic White, Non-Hispanic Black, Non-Hispanic Asian, and Non-Hispanic Other/Multiracial. A value of 0 indicates the population belongs entirely to one group. Higher values indicate a more evenly mixed population. Calculated from U.S. Census Bureau ACS 5-year estimates (table B03002).
Gaithersburg, MD 20879 - Peer Comparisons by Rank and Percentile
The table below compares 20879 to the other 33,772 ZIP Codes in the United States by rank and percentile using 2020-2024 American Community Survey 5-Year Estimates data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.
